// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chrome/browser/chrome_content_browser_client.h"

#include <map>
#include <set>
#include <utility>
#include <vector>

#include "base/base_switches.h"
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/command_line.h"
#include "base/files/scoped_file.h"
#include "base/i18n/base_i18n_switches.h"
#include "base/i18n/character_encoding.h"
#include "base/json/json_reader.h"
#include "base/macros.h"
#include "base/metrics/field_trial_params.h"
#include "base/metrics/histogram_macros.h"
#include "base/no_destructor.h"
#include "base/path_service.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/strings/utf_string_conversions.h"
#include "base/system/sys_info.h"
#include "base/task/post_task.h"
#include "base/threading/thread_task_runner_handle.h"
#include "build/build_config.h"
#include "chrome/browser/after_startup_task_utils.h"
#include "chrome/browser/browser_about_handler.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/browsing_data/browsing_data_helper.h"
#include "chrome/browser/browsing_data/chrome_browsing_data_remover_delegate.h"
#include "chrome/browser/cache_stats_recorder.h"
#include "chrome/browser/chrome_content_browser_client_parts.h"
#include "chrome/browser/chrome_quota_permission_context.h"
#include "chrome/browser/client_hints/client_hints.h"
#include "chrome/browser/content_settings/cookie_settings_factory.h"
#include "chrome/browser/content_settings/host_content_settings_map_factory.h"
#include "chrome/browser/content_settings/tab_specific_content_settings.h"
#include "chrome/browser/data_use_measurement/chrome_data_use_measurement.h"
#include "chrome/browser/defaults.h"
#include "chrome/browser/download/download_prefs.h"
#include "chrome/browser/external_protocol/external_protocol_handler.h"
#include "chrome/browser/font_family_cache.h"
#include "chrome/browser/language/chrome_language_detection_tab_helper.h"
#include "chrome/browser/lifetime/browser_shutdown.h"
#include "chrome/browser/loader/chrome_navigation_data.h"
#include "chrome/browser/media/router/media_router_feature.h"
#include "chrome/browser/media/router/presentation/presentation_service_delegate_impl.h"
#include "chrome/browser/media/router/presentation/receiver_presentation_service_delegate_impl.h"
#include "chrome/browser/media/webrtc/audio_debug_recordings_handler.h"
#include "chrome/browser/media/webrtc/media_capture_devices_dispatcher.h"
#include "chrome/browser/media/webrtc/webrtc_logging_handler_host.h"
#include "chrome/browser/metrics/chrome_browser_main_extra_parts_metrics.h"
#include "chrome/browser/nacl_host/nacl_browser_delegate_impl.h"
#include "chrome/browser/navigation_predictor/navigation_predictor.h"
#include "chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings.h"
#include "chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings_factory.h"
#include "chrome/browser/net/system_network_context_manager.h"
#include "chrome/browser/net_benchmarking.h"
#include "chrome/browser/notifications/platform_notification_service_impl.h"
#include "chrome/browser/page_load_metrics/metrics_navigation_throttle.h"
#include "chrome/browser/page_load_metrics/metrics_web_contents_observer.h"
#include "chrome/browser/page_load_metrics/page_load_metrics_util.h"
#include "chrome/browser/password_manager/chrome_password_manager_client.h"
#include "chrome/browser/payments/payment_request_display_manager_factory.h"
#include "chrome/browser/permissions/attestation_permission_request.h"
#include "chrome/browser/permissions/permission_context_base.h"
#include "chrome/browser/permissions/permission_request_manager.h"
#include "chrome/browser/platform_util.h"
#include "chrome/browser/plugins/pdf_iframe_navigation_throttle.h"
#include "chrome/browser/policy/cloud/policy_header_service_factory.h"
#include "chrome/browser/predictors/loading_predictor.h"
#include "chrome/browser/predictors/loading_predictor_factory.h"
#include "chrome/browser/prerender/prerender_final_status.h"
#include "chrome/browser/prerender/prerender_manager.h"
#include "chrome/browser/prerender/prerender_manager_factory.h"
#include "chrome/browser/prerender/prerender_message_filter.h"
#include "chrome/browser/prerender/prerender_util.h"
#include "chrome/browser/previews/previews_lite_page_decider.h"
#include "chrome/browser/previews/previews_lite_page_navigation_throttle.h"
#include "chrome/browser/previews/previews_service.h"
#include "chrome/browser/previews/previews_service_factory.h"
#include "chrome/browser/previews/previews_ui_tab_helper.h"
#include "chrome/browser/profiles/chrome_browser_main_extra_parts_profiles.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/profiles/profile_io_data.h"
#include "chrome/browser/profiles/renderer_updater.h"
#include "chrome/browser/profiles/renderer_updater_factory.h"
#include "chrome/browser/profiling_host/chrome_browser_main_extra_parts_profiling.h"
#include "chrome/browser/profiling_host/profiling_process_host.h"
#include "chrome/browser/renderer_host/chrome_navigation_ui_data.h"
#include "chrome/browser/renderer_host/chrome_render_message_filter.h"
#include "chrome/browser/renderer_host/pepper/chrome_browser_pepper_host_factory.h"
#include "chrome/browser/renderer_preferences_util.h"
#include "chrome/browser/resource_coordinator/background_tab_navigation_throttle.h"
#include "chrome/browser/resource_coordinator/chrome_browser_main_extra_parts_resource_coordinator.h"
#include "chrome/browser/safe_browsing/certificate_reporting_service.h"
#include "chrome/browser/safe_browsing/certificate_reporting_service_factory.h"
#include "chrome/browser/safe_browsing/chrome_password_protection_service.h"
#include "chrome/browser/safe_browsing/safe_browsing_service.h"
#include "chrome/browser/safe_browsing/ui_manager.h"
#include "chrome/browser/safe_browsing/url_checker_delegate_impl.h"
#include "chrome/browser/search/search.h"
#include "chrome/browser/sessions/session_tab_helper.h"
#include "chrome/browser/signin/chrome_signin_proxying_url_loader_factory.h"
#include "chrome/browser/signin/chrome_signin_url_loader_throttle.h"
#include "chrome/browser/signin/header_modification_delegate_impl.h"
#include "chrome/browser/signin/signin_manager_factory.h"
#include "chrome/browser/speech/chrome_speech_recognition_manager_delegate.h"
#include "chrome/browser/speech/tts_controller_delegate_impl.h"
#include "chrome/browser/speech/tts_message_filter.h"
#include "chrome/browser/ssl/insecure_sensitive_input_driver_factory.h"
#include "chrome/browser/ssl/ssl_blocking_page.h"
#include "chrome/browser/ssl/ssl_cert_reporter.h"
#include "chrome/browser/ssl/ssl_client_certificate_selector.h"
#include "chrome/browser/ssl/ssl_error_handler.h"
#include "chrome/browser/ssl/ssl_error_navigation_throttle.h"
#include "chrome/browser/ssl/typed_navigation_timing_throttle.h"
#include "chrome/browser/subresource_filter/chrome_subresource_filter_client.h"
#include "chrome/browser/sync_file_system/local/sync_file_system_backend.h"
#include "chrome/browser/tab_contents/tab_util.h"
#include "chrome/browser/tracing/chrome_tracing_delegate.h"
#include "chrome/browser/translate/translate_service.h"
#include "chrome/browser/ui/blocked_content/blocked_window_params.h"
#include "chrome/browser/ui/blocked_content/popup_blocker.h"
#include "chrome/browser/ui/blocked_content/tab_under_navigation_throttle.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/browser_finder.h"
#include "chrome/browser/ui/browser_list.h"
#include "chrome/browser/ui/browser_navigator.h"
#include "chrome/browser/ui/browser_navigator_params.h"
#include "chrome/browser/ui/browser_window.h"
#include "chrome/browser/ui/chrome_select_file_policy.h"
#include "chrome/browser/ui/login/login_handler.h"
#include "chrome/browser/ui/prefs/pref_watcher.h"
#include "chrome/browser/ui/sync/sync_promo_ui.h"
#include "chrome/browser/ui/tab_contents/chrome_web_contents_view_delegate.h"
#include "chrome/browser/ui/webui/chrome_web_ui_controller_factory.h"
#include "chrome/browser/ui/webui/log_web_ui_url.h"
#include "chrome/browser/usb/usb_tab_helper.h"
#include "chrome/browser/vr/vr_tab_helper.h"
#include "chrome/browser/webauthn/authenticator_request_scheduler.h"
#include "chrome/browser/webauthn/chrome_authenticator_request_delegate.h"
#include "chrome/common/buildflags.h"
#include "chrome/common/channel_info.h"
#include "chrome/common/chrome_constants.h"
#include "chrome/common/chrome_features.h"
#include "chrome/common/chrome_paths.h"
#include "chrome/common/chrome_paths_internal.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/constants.mojom.h"
#include "chrome/common/env_vars.h"
#include "chrome/common/google_url_loader_throttle.h"
#include "chrome/common/logging_chrome.h"
#include "chrome/common/pepper_permission_util.h"
#include "chrome/common/pref_names.h"
#include "chrome/common/prerender_url_loader_throttle.h"
#include "chrome/common/prerender_util.h"
#include "chrome/common/render_messages.h"
#include "chrome/common/renderer_configuration.mojom.h"
#include "chrome/common/secure_origin_whitelist.h"
#include "chrome/common/stack_sampling_configuration.h"
#include "chrome/common/url_constants.h"
#include "chrome/grit/browser_resources.h"
#include "chrome/grit/generated_resources.h"
#include "chrome/installer/util/google_update_settings.h"
#include "components/autofill/content/browser/content_autofill_driver_factory.h"
#include "components/autofill/core/common/autofill_switches.h"
#include "components/browsing_data/core/browsing_data_utils.h"
#include "components/cdm/browser/cdm_message_filter_android.h"
#include "components/cloud_devices/common/cloud_devices_switches.h"
#include "components/content_settings/core/browser/content_settings_utils.h"
#include "components/content_settings/core/browser/cookie_settings.h"
#include "components/content_settings/core/browser/host_content_settings_map.h"
#include "components/content_settings/core/common/content_settings.h"
#include "components/content_settings/core/common/content_settings_types.h"
#include "components/content_settings/core/common/content_settings_utils.h"
#include "components/content_settings/core/common/pref_names.h"
#include "components/data_reduction_proxy/content/browser/content_lofi_decider.h"
#include "components/data_reduction_proxy/content/common/data_reduction_proxy_url_loader_throttle.h"
#include "components/data_reduction_proxy/core/browser/data_reduction_proxy_data.h"
#include "components/data_reduction_proxy/core/browser/data_reduction_proxy_io_data.h"
#include "components/data_reduction_proxy/core/common/data_reduction_proxy_params.h"
#include "components/dom_distiller/core/dom_distiller_switches.h"
#include "components/dom_distiller/core/url_constants.h"
#include "components/error_page/common/error_page_switches.h"
#include "components/feature_engagement/public/feature_constants.h"
#include "components/feature_engagement/public/feature_list.h"
#include "components/google/core/common/google_util.h"
#include "components/metrics/call_stack_profile_collector.h"
#include "components/metrics/client_info.h"
#include "components/mirroring/mojom/constants.mojom.h"
#include "components/mirroring/service/features.h"
#include "components/nacl/common/buildflags.h"
#include "components/nacl/common/nacl_constants.h"
#include "components/net_log/chrome_net_log.h"
#include "components/password_manager/content/browser/content_password_manager_driver_factory.h"
#include "components/payments/content/payment_request_display_manager.h"
#include "components/policy/content/policy_blacklist_navigation_throttle.h"
#include "components/policy/content/policy_blacklist_service.h"
#include "components/policy/core/common/cloud/policy_header_service.h"
#include "components/pref_registry/pref_registry_syncable.h"
#include "components/prefs/pref_registry_simple.h"
#include "components/prefs/pref_service.h"
#include "components/prefs/scoped_user_pref_update.h"
#include "components/previews/content/previews_content_util.h"
#include "components/previews/content/previews_decider_impl.h"
#include "components/previews/content/previews_ui_service.h"
#include "components/previews/content/previews_user_data.h"
#include "components/previews/core/previews_decider.h"
#include "components/previews/core/previews_experiments.h"
#include "components/rappor/public/rappor_utils.h"
#include "components/rappor/rappor_recorder_impl.h"
#include "components/rappor/rappor_service_impl.h"
#include "components/safe_browsing/browser/browser_url_loader_throttle.h"
#include "components/safe_browsing/browser/mojo_safe_browsing_impl.h"
#include "components/safe_browsing/browser/url_checker_delegate.h"
#include "components/safe_browsing/common/safe_browsing_prefs.h"
#include "components/safe_browsing/db/database_manager.h"
#include "components/safe_browsing/features.h"
#include "components/safe_browsing/password_protection/password_protection_navigation_throttle.h"
#include "components/security_interstitials/content/origin_policy_ui.h"
#include "components/services/heap_profiling/public/mojom/constants.mojom.h"
#include "components/services/unzip/public/interfaces/constants.mojom.h"
#include "components/signin/core/browser/account_consistency_method.h"
#include "components/signin/core/browser/signin_manager_base.h"
#include "components/spellcheck/spellcheck_buildflags.h"
#include "components/subresource_filter/content/browser/content_subresource_filter_throttle_manager.h"
#include "components/task_scheduler_util/variations_util.h"
#include "components/translate/core/common/translate_switches.h"
#include "components/url_formatter/url_fixer.h"
#include "components/variations/variations_associated_data.h"
#include "components/variations/variations_http_header_provider.h"
#include "components/variations/variations_switches.h"
#include "components/version_info/version_info.h"
#include "content/public/browser/browser_child_process_host.h"
#include "content/public/browser/browser_main_parts.h"
#include "content/public/browser/browser_ppapi_host.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/browser_url_handler.h"
#include "content/public/browser/browsing_data_remover.h"
#include "content/public/browser/certificate_request_result_type.h"
#include "content/public/browser/child_process_data.h"
#include "content/public/browser/child_process_security_policy.h"
#include "content/public/browser/client_certificate_delegate.h"
#include "content/public/browser/file_url_loader.h"
#include "content/public/browser/navigation_handle.h"
#include "content/public/browser/navigation_throttle.h"
#include "content/public/browser/overlay_window.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/browser/render_view_host.h"
#include "content/public/browser/resource_context.h"
#include "content/public/browser/site_instance.h"
#include "content/public/browser/storage_partition.h"
#include "content/public/browser/tts_controller.h"
#include "content/public/browser/tts_platform.h"
#include "content/public/browser/url_loader_request_interceptor.h"
#include "content/public/browser/vpn_service_proxy.h"
#include "content/public/browser/web_contents.h"
#include "content/public/browser/web_contents_delegate.h"
#include "content/public/browser/web_ui_url_loader_factory.h"
#include "content/public/common/child_process_host.h"
#include "content/public/common/content_descriptors.h"
#include "content/public/common/content_features.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/renderer_preferences.h"
#include "content/public/common/service_manager_connection.h"
#include "content/public/common/service_names.mojom.h"
#include "content/public/common/url_constants.h"
#include "content/public/common/url_loader_throttle.h"
#include "content/public/common/url_utils.h"
#include "content/public/common/user_agent.h"
#include "content/public/common/web_preferences.h"
#include "device/vr/buildflags/buildflags.h"
#include "extensions/buildflags/buildflags.h"
#include "google_apis/gaia/gaia_urls.h"
#include "google_apis/google_api_keys.h"
#include "gpu/config/gpu_switches.h"
#include "media/audio/audio_manager.h"
#include "media/base/media_switches.h"
#include "media/media_buildflags.h"
#include "media/mojo/buildflags.h"
#include "mojo/public/cpp/bindings/binding_set.h"
#include "mojo/public/cpp/bindings/scoped_interface_endpoint_handle.h"
#include "net/base/load_flags.h"
#include "net/base/mime_util.h"
#include "net/cookies/canonical_cookie.h"
#include "net/cookies/cookie_options.h"
#include "net/ssl/client_cert_store.h"
#include "net/ssl/ssl_cert_request_info.h"
#include "ppapi/buildflags/buildflags.h"
#include "ppapi/host/ppapi_host.h"
#include "printing/buildflags/buildflags.h"
#include "services/network/public/cpp/features.h"
#include "services/network/public/cpp/resource_request.h"
#include "services/preferences/public/cpp/in_process_service_factory.h"
#include "services/preferences/public/mojom/preferences.mojom.h"
#include "services/proxy_resolver/public/mojom/proxy_resolver.mojom.h"
#include "services/service_manager/embedder/switches.h"
#include "services/service_manager/public/cpp/connector.h"
#include "services/service_manager/public/mojom/connector.mojom.h"
#include "services/service_manager/sandbox/sandbox_type.h"
#include "storage/browser/fileapi/external_mount_points.h"
#include "third_party/blink/public/platform/modules/installedapp/installed_app_provider.mojom.h"
#include "third_party/blink/public/platform/modules/webshare/webshare.mojom.h"
#include "third_party/widevine/cdm/buildflags.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/base/ui_base_features.h"
#include "ui/base/ui_features.h"
#include "ui/resources/grit/ui_resources.h"
#include "url/gurl.h"
#include "url/origin.h"

#if defined(OS_WIN)
#include "base/strings/string_tokenizer.h"
#include "chrome/browser/chrome_browser_main_win.h"
#include "chrome/browser/conflicts/module_database_win.h"
#include "chrome/browser/conflicts/module_event_sink_impl_win.h"
#include "chrome/install_static/install_util.h"
#include "chrome/services/util_win/public/mojom/constants.mojom.h"
#include "chrome/services/wifi_util_win/public/mojom/constants.mojom.h"
#include "sandbox/win/src/sandbox_policy.h"
#elif defined(OS_MACOSX)
#include "chrome/browser/chrome_browser_main_mac.h"
#include "services/audio/public/mojom/constants.mojom.h"
#include "services/video_capture/public/mojom/constants.mojom.h"
#elif defined(OS_CHROMEOS)
#include "ash/public/interfaces/constants.mojom.h"
#include "chrome/browser/ash_service_registry.h"
#include "chrome/browser/chromeos/apps/intent_helper/apps_navigation_throttle.h"
#include "chrome/browser/chromeos/arc/fileapi/arc_content_file_system_backend_delegate.h"
#include "chrome/browser/chromeos/arc/fileapi/arc_documents_provider_backend_delegate.h"
#include "chrome/browser/chromeos/chrome_browser_main_chromeos.h"
#include "chrome/browser/chromeos/chrome_content_browser_client_chromeos_part.h"
#include "chrome/browser/chromeos/chrome_service_name.h"
#include "chrome/browser/chromeos/drive/fileapi/drivefs_file_system_backend_delegate.h"
#include "chrome/browser/chromeos/drive/fileapi/file_system_backend_delegate.h"
#include "chrome/browser/chromeos/file_manager/app_id.h"
#include "chrome/browser/chromeos/file_system_provider/fileapi/backend_delegate.h"
#include "chrome/browser/chromeos/fileapi/external_file_url_loader_factory.h"
#include "chrome/browser/chromeos/fileapi/file_system_backend.h"
#include "chrome/browser/chromeos/fileapi/mtp_file_system_backend_delegate.h"
#include "chrome/browser/chromeos/login/signin/merge_session_navigation_throttle.h"
#include "chrome/browser/chromeos/login/signin/merge_session_throttling_utils.h"
#include "chrome/browser/chromeos/login/signin_partition_manager.h"
#include "chrome/browser/chromeos/login/startup_utils.h"
#include "chrome/browser/chromeos/policy/browser_policy_connector_chromeos.h"
#include "chrome/browser/chromeos/policy/policy_cert_service_factory.h"
#include "chrome/browser/chromeos/profiles/profile_helper.h"
#include "chrome/browser/chromeos/system/input_device_settings.h"
#include "chrome/browser/speech/tts_chromeos.h"
#include "chrome/browser/ui/ash/chrome_browser_main_extra_parts_ash.h"
#include "chrome/browser/ui/ash/tablet_mode_client.h"
#include "chrome/browser/ui/browser_dialogs.h"
#include "chromeos/chromeos_constants.h"
#include "chromeos/chromeos_features.h"
#include "chromeos/chromeos_switches.h"
#include "chromeos/services/ime/public/mojom/constants.mojom.h"
#include "chromeos/services/secure_channel/public/mojom/constants.mojom.h"
#include "chromeos/services/secure_channel/secure_channel_service.h"
#include "components/user_manager/user_manager.h"
#include "services/service_manager/public/mojom/interface_provider_spec.mojom.h"
#elif defined(OS_LINUX)
#include "chrome/browser/chrome_browser_main_linux.h"
#elif defined(OS_ANDROID)
#include "base/android/application_status_listener.h"
#include "chrome/browser/android/app_hooks.h"
#include "chrome/browser/android/chrome_context_util.h"
#include "chrome/browser/android/devtools_manager_delegate_android.h"
#include "chrome/browser/android/download/available_offline_content_provider.h"
#include "chrome/browser/android/download/download_manager_service.h"
#include "chrome/browser/android/download/intercept_oma_download_navigation_throttle.h"
#include "chrome/browser/android/ntp/new_tab_page_url_handler.h"
#include "chrome/browser/android/service_tab_launcher.h"
#include "chrome/browser/android/tab_android.h"
#include "chrome/browser/android/webapps/single_tab_mode_tab_helper.h"
#include "chrome/browser/chrome_browser_main_android.h"
#include "chrome/browser/offline_pages/offline_page_auto_fetcher.h"
#include "chrome/common/descriptors_android.h"
#include "chrome/services/media_gallery_util/public/mojom/constants.mojom.h"
#include "components/crash/content/browser/child_exit_observer_android.h"
#include "components/crash/content/browser/crash_memory_metrics_collector_android.h"
#include "components/navigation_interception/intercept_navigation_delegate.h"
#include "content/public/browser/android/java_interfaces.h"
#include "services/proxy_resolver/proxy_resolver_service.h"
#include "services/service_manager/public/cpp/interface_provider.h"
#include "third_party/blink/public/mojom/payments/payment_request.mojom.h"
#include "third_party/blink/public/platform/modules/webauthn/authenticator.mojom.h"
#include "ui/base/resource/resource_bundle_android.h"
#include "ui/base/ui_base_paths.h"
#elif defined(OS_POSIX)
#include "chrome/browser/chrome_browser_main_posix.h"
#endif

#if !defined(OS_ANDROID)
#include "chrome/browser/badging/badge_service_impl.h"
#include "chrome/browser/devtools/chrome_devtools_manager_delegate.h"
#include "chrome/browser/devtools/devtools_window.h"
#include "chrome/browser/media/unified_autoplay_config.h"
#include "chrome/browser/payments/payment_request_factory.h"
#include "chrome/browser/search/instant_service.h"
#include "chrome/browser/search/instant_service_factory.h"
#include "chrome/browser/ui/search/new_tab_page_navigation_throttle.h"
#include "chrome/common/importer/profile_import.mojom.h"
#include "components/services/patch/public/interfaces/constants.mojom.h"
#endif

#if defined(OS_LINUX) || defined(OS_WIN)
#include "chrome/browser/webshare/share_service_impl.h"
#endif

#if defined(OS_WIN) || defined(OS_MACOSX) || \
    (defined(OS_LINUX) && !defined(OS_CHROMEOS))
#include "chrome/browser/browser_switcher/browser_switcher_navigation_throttle.h"
#endif

#if defined(OS_POSIX) && !defined(OS_MACOSX)
#if !defined(OS_ANDROID)
#include "base/debug/leak_annotations.h"
#include "components/crash/content/app/breakpad_linux.h"
#endif  // !defined(OS_ANDROID)
#include "components/crash/content/browser/crash_handler_host_linux.h"
#endif

#if defined(TOOLKIT_VIEWS)
#include "chrome/browser/ui/views/chrome_browser_main_extra_parts_views.h"
#endif

#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
#include "chrome/browser/ui/views/chrome_browser_main_extra_parts_views_linux.h"
#endif

#if defined(USE_X11)
#include "chrome/browser/chrome_browser_main_extra_parts_x11.h"
#endif

#if BUILDFLAG(ENABLE_CAPTIVE_PORTAL_DETECTION)
#include "chrome/browser/captive_portal/captive_portal_tab_helper.h"
#endif

#if BUILDFLAG(ENABLE_NACL)
#include "components/nacl/browser/nacl_browser.h"
#include "components/nacl/browser/nacl_host_message_filter.h"
#include "components/nacl/browser/nacl_process_host.h"
#include "components/nacl/common/nacl_process_type.h"
#include "components/nacl/common/nacl_switches.h"
#endif

#if BUILDFLAG(ENABLE_EXTENSIONS)
#include "chrome/browser/accessibility/animation_policy_prefs.h"
#include "chrome/browser/apps/platform_apps/platform_app_navigation_redirector.h"
#include "chrome/browser/extensions/bookmark_app_experimental_navigation_throttle.h"
#include "chrome/browser/extensions/bookmark_app_navigation_throttle.h"
#include "chrome/browser/extensions/chrome_content_browser_client_extensions_part.h"
#include "chrome/browser/extensions/chrome_extension_web_contents_observer.h"
#include "chrome/browser/extensions/user_script_listener.h"
#include "chrome/browser/media/cast_transport_host_filter.h"
#include "chrome/browser/speech/extension_api/tts_engine_extension_api.h"
#include "chrome/browser/ui/extensions/hosted_app_browser_controller.h"
#include "chrome/services/media_gallery_util/public/mojom/constants.mojom.h"
#include "chrome/services/removable_storage_writer/public/mojom/constants.mojom.h"
#include "components/guest_view/browser/guest_view_base.h"
#include "components/guest_view/browser/guest_view_manager.h"
#include "extensions/browser/api/web_request/web_request_api.h"
#include "extensions/browser/extension_host.h"
#include "extensions/browser/extension_navigation_throttle.h"
#include "extensions/browser/extension_protocols.h"
#include "extensions/browser/extension_registry.h"
#include "extensions/browser/extension_system.h"
#include "extensions/browser/extension_util.h"
#include "extensions/browser/guest_view/extensions_guest_view_message_filter.h"
#include "extensions/browser/guest_view/web_view/web_view_guest.h"
#include "extensions/browser/guest_view/web_view/web_view_permission_helper.h"
#include "extensions/browser/guest_view/web_view/web_view_renderer_state.h"
#include "extensions/browser/process_manager.h"
#include "extensions/common/constants.h"
#include "extensions/common/extension.h"
#include "extensions/common/extension_set.h"
#include "extensions/common/manifest_handlers/background_info.h"
#include "extensions/common/manifest_handlers/shared_module_info.h"
#include "extensions/common/manifest_handlers/web_accessible_resources_info.h"
#include "extensions/common/permissions/permissions_data.h"
#include "extensions/common/permissions/socket_permission.h"
#include "extensions/common/switches.h"
#endif  // BUILDFLAG(ENABLE_EXTENSIONS)

#if BUILDFLAG(ENABLE_PLUGINS)
#include "chrome/browser/plugins/chrome_content_browser_client_plugins_part.h"
#include "chrome/browser/plugins/flash_download_interception.h"
#include "chrome/browser/plugins/plugin_response_interceptor_url_loader_throttle.h"
#endif

#if BUILDFLAG(ENABLE_SUPERVISED_USERS)
#include "chrome/browser/supervised_user/supervised_user_google_auth_navigation_throttle.h"
#endif

#if BUILDFLAG(ENABLE_MEDIA_REMOTING)
#include "chrome/browser/media/cast_remoting_connector.h"
#endif

#if BUILDFLAG(ENABLE_PRINTING)
#include "chrome/browser/printing/printing_message_filter.h"
#include "components/services/pdf_compositor/public/interfaces/pdf_compositor.mojom.h"
#endif

#if BUILDFLAG(ENABLE_PRINT_PREVIEW) || \
    (BUILDFLAG(ENABLE_PRINTING) && defined(OS_WIN))
#include "chrome/services/printing/public/mojom/constants.mojom.h"
#endif

#if BUILDFLAG(ENABLE_LIBRARY_CDMS)
#include "chrome/browser/media/output_protection_impl.h"
#include "chrome/browser/media/platform_verification_impl.h"
#if defined(OS_WIN) && BUILDFLAG(ENABLE_WIDEVINE)
#include "chrome/browser/media/widevine_hardware_caps_win.h"
#include "third_party/widevine/cdm/widevine_cdm_common.h"
#endif
#endif

#if BUILDFLAG(ENABLE_MOJO_CDM) && defined(OS_ANDROID)
#include "chrome/browser/media/android/cdm/media_drm_storage_factory.h"
#endif

#if BUILDFLAG(ENABLE_MOJO_MEDIA_IN_BROWSER_PROCESS)
#include "media/mojo/interfaces/constants.mojom.h"      // nogncheck
#include "media/mojo/services/media_service_factory.h"  // nogncheck
#endif

#if BUILDFLAG(ENABLE_SUPERVISED_USERS)
#include "chrome/browser/supervised_user/supervised_user_navigation_throttle.h"
#endif

#if BUILDFLAG(ENABLE_PRINTING) && defined(OS_CHROMEOS)
#include "chrome/services/cups_ipp_parser/public/mojom/constants.mojom.h"
#endif

#if defined(FULL_SAFE_BROWSING) || defined(OS_CHROMEOS)
#include "chrome/services/file_util/public/mojom/constants.mojom.h"
#endif

#if BUILDFLAG(ENABLE_OFFLINE_PAGES)
#include "chrome/browser/offline_pages/offline_page_tab_helper.h"
#include "chrome/browser/offline_pages/offline_page_url_loader_request_interceptor.h"
#endif

#if BUILDFLAG(ENABLE_SIMPLE_BROWSER_SERVICE_IN_PROCESS)
#include "services/content/simple_browser/public/mojom/constants.mojom.h"
#include "services/content/simple_browser/simple_browser_service.h"
#endif

#if BUILDFLAG(ENABLE_SIMPLE_BROWSER_SERVICE_OUT_OF_PROCESS)
#include "services/content/simple_browser/public/mojom/constants.mojom.h"
#endif

#if BUILDFLAG(ENABLE_ISOLATED_XR_SERVICE)
#include "device/vr/public/mojom/isolated_xr_service.mojom.h"
#endif

using base::FileDescriptor;
using content::BrowserThread;
using content::BrowserURLHandler;
using content::BrowsingDataFilterBuilder;
using content::ChildProcessSecurityPolicy;
using content::QuotaPermissionContext;
using content::RenderFrameHost;
using content::RenderViewHost;
using content::ResourceType;
using content::SiteInstance;
using content::WebContents;
using content::WebPreferences;
using message_center::NotifierId;

#if defined(OS_POSIX)
using content::PosixFileDescriptorInfo;
#endif

#if BUILDFLAG(ENABLE_EXTENSIONS)
using extensions::APIPermission;
using extensions::ChromeContentBrowserClientExtensionsPart;
using extensions::Extension;
using extensions::Manifest;
#endif

#if BUILDFLAG(ENABLE_PLUGINS)
using plugins::ChromeContentBrowserClientPluginsPart;
#endif

namespace {

const storage::QuotaSettings* g_default_quota_settings;

#if BUILDFLAG(ENABLE_PLUGINS)
// TODO(teravest): Add renderer-side API-specific checking for these APIs so
// that blanket permission isn't granted to all dev channel APIs for these.
// http://crbug.com/386743
const char* const kPredefinedAllowedDevChannelOrigins[] = {
  "6EAED1924DB611B6EEF2A664BD077BE7EAD33B8F",  // see crbug.com/383937
  "4EB74897CB187C7633357C2FE832E0AD6A44883A"   // see crbug.com/383937
};

const char* const kPredefinedAllowedFileHandleOrigins[] = {
  "6EAED1924DB611B6EEF2A664BD077BE7EAD33B8F",  // see crbug.com/234789
  "4EB74897CB187C7633357C2FE832E0AD6A44883A"   // see crbug.com/234789
};

const char* const kPredefinedAllowedSocketOrigins[] = {
  "okddffdblfhhnmhodogpojmfkjmhinfp",  // Secure Shell App (dev)
  "pnhechapfaindjhompbnflcldabbghjo",  // Secure Shell App (stable)
  "algkcnfjnajfhgimadimbjhmpaeohhln",  // Secure Shell Extension (dev)
  "iodihamcpbpeioajjeobimgagajmlibd",  // Secure Shell Extension (stable)
  "bglhmjfplikpjnfoegeomebmfnkjomhe",  // see crbug.com/122126
  "gbchcmhmhahfdphkhkmpfmihenigjmpp",  // Chrome Remote Desktop
  "kgngmbheleoaphbjbaiobfdepmghbfah",  // Pre-release Chrome Remote Desktop
  "odkaodonbgfohohmklejpjiejmcipmib",  // Dogfood Chrome Remote Desktop
  "ojoimpklfciegopdfgeenehpalipignm",  // Chromoting canary
  "cbkkbcmdlboombapidmoeolnmdacpkch",  // see crbug.com/129089
  "hhnbmknkdabfoieppbbljkhkfjcmcbjh",  // see crbug.com/134099
  "mablfbjkhmhkmefkjjacnbaikjkipphg",  // see crbug.com/134099
  "pdeelgamlgannhelgoegilelnnojegoh",  // see crbug.com/134099
  "cabapfdbkniadpollkckdnedaanlciaj",  // see crbug.com/134099
  "mapljbgnjledlpdmlchihnmeclmefbba",  // see crbug.com/134099
  "ghbfeebgmiidnnmeobbbaiamklmpbpii",  // see crbug.com/134099
  "jdfhpkjeckflbbleddjlpimecpbjdeep",  // see crbug.com/142514
  "iabmpiboiopbgfabjmgeedhcmjenhbla",  // see crbug.com/165080
  "B7CF8A292249681AF81771650BA4CEEAF19A4560",  // see crbug.com/165080
  "7525AF4F66763A70A883C4700529F647B470E4D2",  // see crbug.com/238084
  "0B549507088E1564D672F7942EB87CA4DAD73972",  // see crbug.com/238084
  "864288364E239573E777D3E0E36864E590E95C74"   // see crbug.com/238084
};
#endif

enum AppLoadedInTabSource {
  // A platform app page tried to load one of its own URLs in a tab.
  APP_LOADED_IN_TAB_SOURCE_APP = 0,

  // A platform app background page tried to load one of its own URLs in a tab.
  APP_LOADED_IN_TAB_SOURCE_BACKGROUND_PAGE,

  // An extension or app tried to load a resource of a different platform app in
  // a tab.
  APP_LOADED_IN_TAB_SOURCE_OTHER_EXTENSION,

  // A non-app and non-extension page tried to load a platform app in a tab.
  APP_LOADED_IN_TAB_SOURCE_OTHER,

  APP_LOADED_IN_TAB_SOURCE_MAX
};

// Cached version of the locale so we can return the locale on the I/O
// thread.
std::string& GetIOThreadApplicationLocale() {
  static base::NoDestructor<std::string> s;
  return *s;
}

// Returns a copy of the given url with its host set to given host and path set
// to given path. Other parts of the url will be the same.
GURL ReplaceURLHostAndPath(const GURL& url,
                           const std::string& host,
                           const std::string& path) {
  url::Replacements<char> replacements;
  replacements.SetHost(host.c_str(), url::Component(0, host.length()));
  replacements.SetPath(path.c_str(), url::Component(0, path.length()));
  return url.ReplaceComponents(replacements);
}

// Handles the rewriting of the new tab page URL based on group policy.
bool HandleNewTabPageLocationOverride(
    GURL* url,
    content::BrowserContext* browser_context) {
  if (!url->SchemeIs(content::kChromeUIScheme) ||
      url->host() != chrome::kChromeUINewTabHost)
    return false;

  Profile* profile = Profile::FromBrowserContext(browser_context);
  std::string ntp_location =
      profile->GetPrefs()->GetString(prefs::kNewTabPageLocationOverride);
  if (ntp_location.empty())
    return false;

  *url = GURL(ntp_location);
  return true;
}

bool CertMatchesFilter(const net::X509Certificate& cert,
                       const base::DictionaryValue& filter) {
  // TODO(markusheintz): This is the minimal required filter implementation.
  // Implement a better matcher.

  // An empty filter matches any client certificate since no requirements are
  // specified at all.
  if (filter.empty())
    return true;

  std::string common_name;
  if (filter.GetString("ISSUER.CN", &common_name) &&
      (cert.issuer().common_name == common_name)) {
    return true;
  }
  return false;
}

#if !defined(OS_ANDROID)
// Check if the current url is whitelisted based on a list of whitelisted urls.
bool IsURLWhitelisted(const GURL& current_url,
                      const base::Value::ListStorage& whitelisted_urls) {
  // Only check on HTTP and HTTPS pages.
  if (!current_url.SchemeIsHTTPOrHTTPS())
    return false;

  for (auto const& value : whitelisted_urls) {
    ContentSettingsPattern pattern =
        ContentSettingsPattern::FromString(value.GetString());
    if (pattern == ContentSettingsPattern::Wildcard() || !pattern.IsValid())
      continue;
    if (pattern.Matches(current_url))
      return true;
  }

  return false;
}

// Check if autoplay is allowed by policy configuration.
bool IsAutoplayAllowedByPolicy(content::WebContents* contents,
                               PrefService* prefs) {
  DCHECK(prefs);

  // Check if we have globally allowed autoplay by policy.
  if (prefs->GetBoolean(prefs::kAutoplayAllowed) &&
      prefs->IsManagedPreference(prefs::kAutoplayAllowed)) {
    return true;
  }

  if (!contents)
    return false;

  // Check if the current URL matches a URL pattern on the whitelist.
  const base::ListValue* autoplay_whitelist =
      prefs->GetList(prefs::kAutoplayWhitelist);
  return autoplay_whitelist &&
         prefs->IsManagedPreference(prefs::kAutoplayWhitelist) &&
         IsURLWhitelisted(contents->GetURL(), autoplay_whitelist->GetList());
}
#endif

#if defined(OS_ANDROID)
int GetCrashSignalFD(const base::CommandLine& command_line) {
  return crashpad::CrashHandlerHost::Get()->GetDeathSignalSocket();
}
#elif defined(OS_POSIX) && !defined(OS_MACOSX)
breakpad::CrashHandlerHostLinux* CreateCrashHandlerHost(
    const std::string& process_type) {
  base::FilePath dumps_path;
  base::PathService::Get(chrome::DIR_CRASH_DUMPS, &dumps_path);
  {
    ANNOTATE_SCOPED_MEMORY_LEAK;
    bool upload = (getenv(env_vars::kHeadless) == NULL);
    breakpad::CrashHandlerHostLinux* crash_handler =
        new breakpad::CrashHandlerHostLinux(process_type, dumps_path, upload);
    crash_handler->StartUploaderThread();
    return crash_handler;
  }
}

int GetCrashSignalFD(const base::CommandLine& command_line) {
  // Extensions have the same process type as renderers.
  if (command_line.HasSwitch(extensions::switches::kExtensionProcess)) {
    static breakpad::CrashHandlerHostLinux* crash_handler = NULL;
    if (!crash_handler)
      crash_handler = CreateCrashHandlerHost("extension");
    return crash_handler->GetDeathSignalSocket();
  }

#if defined(OS_CHROMEOS)
  // Mash services are utility processes, but crashes are reported using the
  // service name as the process type to make the crash console easier to read.
  if (command_line.HasSwitch(switches::kMashServiceName)) {
    static base::NoDestructor<
        std::map<std::string, breakpad::CrashHandlerHostLinux*>>
        crash_handlers;
    std::string service_name =
        command_line.GetSwitchValueASCII(switches::kMashServiceName);
    auto it = crash_handlers->find(service_name);
    if (it == crash_handlers->end()) {
      crash_handlers->insert(
          std::make_pair(service_name, CreateCrashHandlerHost(service_name)));
    }
    return crash_handlers->at(service_name)->GetDeathSignalSocket();
  }
#endif  // defined(OS_CHROMEOS)

  std::string process_type =
      command_line.GetSwitchValueASCII(switches::kProcessType);

  if (process_type == switches::kRendererProcess) {
    static breakpad::CrashHandlerHostLinux* crash_handler = NULL;
    if (!crash_handler)
      crash_handler = CreateCrashHandlerHost(process_type);
    return crash_handler->GetDeathSignalSocket();
  }

  if (process_type == switches::kPpapiPluginProcess) {
    static breakpad::CrashHandlerHostLinux* crash_handler = NULL;
    if (!crash_handler)
      crash_handler = CreateCrashHandlerHost(process_type);
    return crash_handler->GetDeathSignalSocket();
  }

  if (process_type == switches::kGpuProcess) {
    static breakpad::CrashHandlerHostLinux* crash_handler = NULL;
    if (!crash_handler)
      crash_handler = CreateCrashHandlerHost(process_type);
    return crash_handler->GetDeathSignalSocket();
  }

  if (process_type == switches::kUtilityProcess) {
    static breakpad::CrashHandlerHostLinux* crash_handler = nullptr;
    if (!crash_handler)
      crash_handler = CreateCrashHandlerHost(process_type);
    return crash_handler->GetDeathSignalSocket();
  }

  return -1;
}
#endif  // defined(OS_ANDROID)

void SetApplicationLocaleOnIOThread(const std::string& locale) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  GetIOThreadApplicationLocale() = locale;
}

// An implementation of the SSLCertReporter interface used by
// SSLErrorHandler. Uses CertificateReportingService to send reports. The
// service handles queueing and re-sending of failed reports. Each certificate
// error creates a new instance of this class.
class CertificateReportingServiceCertReporter : public SSLCertReporter {
 public:
  explicit CertificateReportingServiceCertReporter(
      content::WebContents* web_contents)
      : service_(CertificateReportingServiceFactory::GetForBrowserContext(
            web_contents->GetBrowserContext())) {}
  ~CertificateReportingServiceCertReporter() override {}

  // SSLCertReporter implementation
  void ReportInvalidCertificateChain(
      const std::string& serialized_report) override {
    service_->Send(serialized_report);
  }

 private:
  CertificateReportingService* service_;

  DISALLOW_COPY_AND_ASSIGN(CertificateReportingServiceCertReporter);
};

#if defined(OS_ANDROID)
float GetDeviceScaleAdjustment() {
  static const float kMinFSM = 1.05f;
  static const int kWidthForMinFSM = 320;
  static const float kMaxFSM = 1.3f;
  static const int kWidthForMaxFSM = 800;

  int minWidth = chrome::android::ChromeContextUtil::GetSmallestDIPWidth();

  if (minWidth <= kWidthForMinFSM)
    return kMinFSM;
  if (minWidth >= kWidthForMaxFSM)
    return kMaxFSM;

  // The font scale multiplier varies linearly between kMinFSM and kMaxFSM.
  float ratio = static_cast<float>(minWidth - kWidthForMinFSM) /
      (kWidthForMaxFSM - kWidthForMinFSM);
  return ratio * (kMaxFSM - kMinFSM) + kMinFSM;
}

void StartDownloadManager(service_manager::mojom::ServiceRequest request) {
  DownloadManagerService::GetInstance()->BindServiceRequest(std::move(request));
}
#endif  // defined(OS_ANDROID)

#if BUILDFLAG(ENABLE_EXTENSIONS)

AppLoadedInTabSource ClassifyAppLoadedInTabSource(
    const GURL& opener_url,
    const extensions::Extension* target_platform_app) {
  if (opener_url.SchemeIs(extensions::kExtensionScheme)) {
    if (opener_url.host_piece() == target_platform_app->id()) {
      // This platform app was trying to window.open() one of its own URLs.
      if (opener_url ==
          extensions::BackgroundInfo::GetBackgroundURL(target_platform_app)) {
        // Source was the background page.
        return APP_LOADED_IN_TAB_SOURCE_BACKGROUND_PAGE;
      } else {
        // Source was a different page inside the app.
        return APP_LOADED_IN_TAB_SOURCE_APP;
      }
    }
    // The forbidden app URL was being opened by a different app or extension.
    return APP_LOADED_IN_TAB_SOURCE_OTHER_EXTENSION;
  }
  // The forbidden app URL was being opened by a non-extension page (e.g. http).
  return APP_LOADED_IN_TAB_SOURCE_OTHER;
}
#endif  // BUILDFLAG(ENABLE_EXTENSIONS)

bool GetDataSaverEnabledPref(const PrefService* prefs) {
  // Enable data saver only when data saver pref is enabled and not part of
  // "Disabled" group of "SaveDataHeader" experiment.
  return prefs->GetBoolean(prefs::kDataSaverEnabled) &&
         base::FieldTrialList::FindFullName("SaveDataHeader")
             .compare("Disabled");
}

WebContents* GetWebContentsFromProcessAndFrameId(int render_process_id,
                                                 int render_frame_id) {
  if (render_process_id) {
    RenderFrameHost* rfh =
        RenderFrameHost::FromID(render_process_id, render_frame_id);
    return WebContents::FromRenderFrameHost(rfh);
  }
  return WebContents::FromFrameTreeNodeId(render_frame_id);
}

#if BUILDFLAG(ENABLE_EXTENSIONS)
// Returns true if there is is an extension matching |url| in
// |opener_render_process_id| with APIPermission::kBackground.
//
// Note that GetExtensionOrAppByURL requires a full URL in order to match with a
// hosted app, even though normal extensions just use the host.
bool URLHasExtensionBackgroundPermission(
    extensions::ProcessMap* process_map,
    extensions::ExtensionRegistry* registry,
    const GURL& url,
    int opener_render_process_id) {
  // Note: includes web URLs that are part of an extension's web extent.
  const Extension* extension =
      registry->enabled_extensions().GetExtensionOrAppByURL(url);
  return extension &&
         extension->permissions_data()->HasAPIPermission(
             APIPermission::kBackground) &&
         process_map->Contains(extension->id(), opener_render_process_id);
}

void InvokeCallbackOnThread(
    scoped_refptr<base::SequencedTaskRunner> task_runner,
    base::Callback<void(bool)> callback,
    bool result) {
  task_runner->PostTask(FROM_HERE, base::BindOnce(std::move(callback), result));
}
#endif

chrome::mojom::PrerenderCanceler* GetPrerenderCanceller(
    const base::Callback<content::WebContents*()>& wc_getter) {
  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
  auto* web_contents = wc_getter.Run();
  if (!web_contents)
    return nullptr;

  return prerender::PrerenderContents::FromWebContents(web_contents);
}

void LaunchURL(
    const GURL& url,
    const content::ResourceRequestInfo::WebContentsGetter& web_contents_getter,
    ui::PageTransition page_transition,
    bool has_user_gesture) {
  // If there is no longer a WebContents, the request may have raced with tab
  // closing. Don't fire the external request. (It may have been a prerender.)
  content::WebContents* web_contents = web_contents_getter.Run();
  if (!web_contents)
    return;

  // Do not launch external requests attached to unswapped prerenders.
  prerender::PrerenderContents* prerender_contents =
      prerender::PrerenderContents::FromWebContents(web_contents);
  if (prerender_contents) {
    prerender_contents->Destroy(prerender::FINAL_STATUS_UNSUPPORTED_SCHEME);
    prerender::ReportPrerenderExternalURL();
    return;
  }

  bool is_whitelisted = false;
  Profile* profile =
      Profile::FromBrowserContext(web_contents->GetBrowserContext());
  PolicyBlacklistService* service =
      PolicyBlacklistFactory::GetForBrowserContext(profile);
  if (service) {
    const policy::URLBlacklist::URLBlacklistState url_state =
        service->GetURLBlacklistState(url);
    is_whitelisted =
        url_state == policy::URLBlacklist::URLBlacklistState::URL_IN_WHITELIST;
  }

  // If the URL is in whitelist, we launch it without asking the user and
  // without any additional security checks. Since the URL is whitelisted,
  // we assume it can be executed.
  if (is_whitelisted) {
    ExternalProtocolHandler::LaunchUrlWithoutSecurityCheck(url, web_contents);
  } else {
    ExternalProtocolHandler::LaunchUrl(
        url, web_contents->GetRenderViewHost()->GetProcess()->GetID(),
        web_contents->GetRenderViewHost()->GetRoutingID(), page_transition,
        has_user_gesture);
  }
}

std::string GetProduct() {
  return version_info::GetProductNameAndVersionForUserAgent();
}

}  // namespace

std::string GetUserAgent() {
  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
  if (command_line->HasSwitch(switches::kUserAgent)) {
    std::string ua = command_line->GetSwitchValueASCII(switches::kUserAgent);
    if (net::HttpUtil::IsValidHeaderValue(ua))
      return ua;
    LOG(WARNING) << "Ignored invalid value for flag --" << switches::kUserAgent;
  }

  std::string product = GetProduct();
#if defined(OS_ANDROID)
  if (command_line->HasSwitch(switches::kUseMobileUserAgent))
    product += " Mobile";
#endif
  return content::BuildUserAgentFromProduct(product);
}

ChromeContentBrowserClient::ChromeContentBrowserClient(
    ChromeFeatureListCreator* chrome_feature_list_creator)
    : chrome_feature_list_creator_(chrome_feature_list_creator),
      weak_factory_(this) {
#if BUILDFLAG(ENABLE_PLUGINS)
  for (size_t i = 0; i < arraysize(kPredefinedAllowedDevChannelOrigins); ++i)
    allowed_dev_channel_origins_.insert(kPredefinedAllowedDevChannelOrigins[i]);
  for (size_t i = 0; i < arraysize(kPredefinedAllowedFileHandleOrigins); ++i)
    allowed_file_handle_origins_.insert(kPredefinedAllowedFileHandleOrigins[i]);
  for (size_t i = 0; i < arraysize(kPredefinedAllowedSocketOrigins); ++i)
    allowed_socket_origins_.insert(kPredefinedAllowedSocketOrigins[i]);

  extra_parts_.push_back(new ChromeContentBrowserClientPluginsPart);
#endif

#if defined(OS_CHROMEOS)
  extra_parts_.push_back(new ChromeContentBrowserClientChromeOsPart);
#endif  // defined(OS_CHROMEOS)

#if BUILDFLAG(ENABLE_EXTENSIONS)
  extra_parts_.push_back(new ChromeContentBrowserClientExtensionsPart);
#endif

  gpu_binder_registry_.AddInterface(
      base::Bind(&metrics::CallStackProfileCollector::Create));
}

ChromeContentBrowserClient::~ChromeContentBrowserClient() {
  for (int i = static_cast<int>(extra_parts_.size()) - 1; i >= 0; --i)
    delete extra_parts_[i];
  extra_parts_.clear();
}

// static
void ChromeContentBrowserClient::RegisterLocalStatePrefs(
    PrefRegistrySimple* registry) {
  registry->RegisterStringPref(prefs::kIsolateOrigins, std::string());
  registry->RegisterBooleanPref(prefs::kSitePerProcess, false);
  registry->RegisterBooleanPref(prefs::kTabLifecyclesEnabled, true);
  registry->RegisterBooleanPref(prefs::kWebDriverOverridesIncompatiblePolicies,
                                false);
}

// static
void ChromeContentBrowserClient::RegisterProfilePrefs(
    user_prefs::PrefRegistrySyncable* registry) {
  registry->RegisterBooleanPref(prefs::kDisable3DAPIs, false);
  registry->RegisterBooleanPref(prefs::kEnableHyperlinkAuditing, true);
  registry->RegisterListPref(prefs::kEnableDeprecatedWebPlatformFeatures);
  // Register user prefs for mapping SitePerProcess and IsolateOrigins in
  // user policy in addition to the same named ones in Local State (which are
  // used for mapping the command-line flags).
  registry->RegisterStringPref(prefs::kIsolateOrigins, std::string());
  registry->RegisterBooleanPref(prefs::kSitePerProcess, false);
#if !defined(OS_ANDROID)
  registry->RegisterBooleanPref(prefs::kAutoplayAllowed, false);
  registry->RegisterListPref(prefs::kAutoplayWhitelist);
#endif
}

// static
void ChromeContentBrowserClient::SetApplicationLocale(
    const std::string& locale) {
  // The common case is that this function is called early in Chrome startup
  // before any threads are created or registered. When there are no threads,
  // we can just set the string without worrying about threadsafety.
  if (!BrowserThread::IsThreadInitialized(BrowserThread::IO)) {
    GetIOThreadApplicationLocale() = locale;
    return;
  }

  // Otherwise we're being called to change the locale. In this case set it on
  // the IO thread.
  DCHECK_CURRENTLY_ON(BrowserThread::UI);

  base::PostTaskWithTraits(
      FROM_HERE, {BrowserThread::IO},
      base::BindOnce(&SetApplicationLocaleOnIOThread, locale));
}

content::BrowserMainParts* ChromeContentBrowserClient::CreateBrowserMainParts(
    const content::MainFunctionParams& parameters) {
  ChromeBrowserMainParts* main_parts;
  // Construct the Main browser parts based on the OS type.
#if defined(OS_WIN)
  main_parts =
      new ChromeBrowserMainPartsWin(parameters, chrome_feature_list_creator_);
#elif defined(OS_MACOSX)
  main_parts =
      new ChromeBrowserMainPartsMac(parameters, chrome_feature_list_creator_);
#elif defined(OS_CHROMEOS)
  main_parts = new chromeos::ChromeBrowserMainPartsChromeos(
      parameters, chrome_feature_list_creator_);
#elif defined(OS_LINUX)
  main_parts =
      new ChromeBrowserMainPartsLinux(parameters, chrome_feature_list_creator_);
#elif defined(OS_ANDROID)
  main_parts = new ChromeBrowserMainPartsAndroid(parameters,
                                                 chrome_feature_list_creator_);
#elif defined(OS_POSIX)
  main_parts =
      new ChromeBrowserMainPartsPosix(parameters, chrome_feature_list_creator_);
#else
  NOTREACHED();
  main_parts =
      new ChromeBrowserMainParts(parameters, chrome_feature_list_creator_);
#endif

  chrome::AddProfilesExtraParts(main_parts);

  // Construct additional browser parts. Stages are called in the order in
  // which they are added.
#if defined(TOOLKIT_VIEWS)
#if defined(OS_LINUX) && !defined(OS_CHROMEOS) && !defined(USE_OZONE)
  main_parts->AddParts(new ChromeBrowserMainExtraPartsViewsLinux());
#else
  main_parts->AddParts(new ChromeBrowserMainExtraPartsViews());
#endif
#endif

#if defined(OS_CHROMEOS)
  // TODO(jamescook): Combine with ChromeBrowserMainPartsChromeos.
  main_parts->AddParts(new ChromeBrowserMainExtraPartsAsh());
#endif

#if defined(USE_X11)
  main_parts->AddParts(new ChromeBrowserMainExtraPartsX11());
#endif

  main_parts->AddParts(new ChromeBrowserMainExtraPartsResourceCoordinator);

  main_parts->AddParts(new ChromeBrowserMainExtraPartsProfiling);

  chrome::AddMetricsExtraParts(main_parts);

  main_parts->AddParts(ChromeService::GetInstance()->CreateExtraParts());

  return main_parts;
}

void ChromeContentBrowserClient::PostAfterStartupTask(
    const base::Location& from_here,
    const scoped_refptr<base::TaskRunner>& task_runner,
    base::OnceClosure task) {
  AfterStartupTaskUtils::PostTask(from_here, task_runner, std::move(task));
}

bool ChromeContentBrowserClient::IsBrowserStartupComplete() {
  return AfterStartupTaskUtils::IsBrowserStartupComplete();
}

void ChromeContentBrowserClient::SetBrowserStartupIsCompleteForTesting() {
  AfterStartupTaskUtils::SetBrowserStartupIsCompleteForTesting();
}

std::string ChromeContentBrowserClient::GetStoragePartitionIdForSite(
    content::BrowserContext* browser_context,
    const GURL& site) {
  std::string partition_id;

  // The partition ID for webview guest processes is the string value of its
  // SiteInstance URL - "chrome-guest://app_id/persist?partition".
  if (site.SchemeIs(content::kGuestScheme))
    partition_id = site.spec();
#if BUILDFLAG(ENABLE_EXTENSIONS)
  // The partition ID for extensions with isolated storage is treated similarly
  // to the above.
  else if (site.SchemeIs(extensions::kExtensionScheme) &&
           extensions::util::SiteHasIsolatedStorage(site, browser_context))
    partition_id = site.spec();
#endif

  DCHECK(IsValidStoragePartitionId(browser_context, partition_id));
  return partition_id;
}

bool ChromeContentBrowserClient::IsValidStoragePartitionId(
    content::BrowserContext* browser_context,
    const std::string& partition_id) {
  // The default ID is empty and is always valid.
  if (partition_id.empty())
    return true;

  return GURL(partition_id).is_valid();
}

void ChromeContentBrowserClient::GetStoragePartitionConfigForSite(
    content::BrowserContext* browser_context,
    const GURL& site,
    bool can_be_default,
    std::string* partition_domain,
    std::string* partition_name,
    bool* in_memory) {
  // Default to the browser-wide storage partition and override based on |site|
  // below.
  partition_domain->clear();
  partition_name->clear();
  *in_memory = false;

#if BUILDFLAG(ENABLE_EXTENSIONS)
  bool success = extensions::WebViewGuest::GetGuestPartitionConfigForSite(
      site, partition_domain, partition_name, in_memory);

  if (!success && site.SchemeIs(extensions::kExtensionScheme)) {
    // If |can_be_default| is false, the caller is stating that the |site|
    // should be parsed as if it had isolated storage. In particular it is
    // important to NOT check ExtensionService for the is_storage_isolated()
    // attribute because this code path is run during Extension uninstall
    // to do cleanup after the Extension has already been unloaded from the
    // ExtensionService.
    bool is_isolated = !can_be_default;
    if (can_be_default) {
      if (extensions::util::SiteHasIsolatedStorage(site, browser_context))
        is_isolated = true;
    }

    if (is_isolated) {
      CHECK(site.has_host());
      // For extensions with isolated storage, the the host of the |site| is
      // the |partition_domain|. The |in_memory| and |partition_name| are only
      // used in guest schemes so they are cleared here.
      *partition_domain = site.host();
      *in_memory = false;
      partition_name->clear();
    }
    success = true;
  }
#endif

  // Assert that if |can_be_default| is false, the code above must have found a
  // non-default partition.  If this fails, the caller has a serious logic
  // error about which StoragePartition they expect to be in and it is not
  // safe to continue.
  CHECK(can_be_default || !partition_domain->empty());
}

content::WebContentsViewDelegate*
    ChromeContentBrowserClient::GetWebContentsViewDelegate(
        content::WebContents* web_contents) {
  return CreateWebContentsViewDelegate(web_contents);
}

bool ChromeContentBrowserClient::AllowGpuLaunchRetryOnIOThread() {
#if defined(OS_ANDROID)
  const base::android::ApplicationState app_state =
      base::android::ApplicationStatusListener::GetState();
  return base::android::APPLICATION_STATE_UNKNOWN == app_state ||
         base::android::APPLICATION_STATE_HAS_RUNNING_ACTIVITIES == app_state ||
         base::android::APPLICATION_STATE_HAS_PAUSED_ACTIVITIES == app_state;
#else
  return true;
#endif
}

void ChromeContentBrowserClient::RenderProcessWillLaunch(
    content::RenderProcessHost* host,
    service_manager::mojom::ServiceRequest* service_request) {
  int id = host->GetID();
  Profile* profile = Profile::FromBrowserContext(host->GetBrowserContext());
  host->AddFilter(new ChromeRenderMessageFilter(id, profile));
#if BUILDFLAG(ENABLE_EXTENSIONS)
  host->AddFilter(new cast::CastTransportHostFilter());
#endif
#if BUILDFLAG(ENABLE_PRINTING)
  host->AddFilter(new printing::PrintingMessageFilter(id, profile));
#endif
  host->AddFilter(new prerender::PrerenderMessageFilter(id, profile));
  host->AddFilter(new TtsMessageFilter(host->GetBrowserContext()));
  WebRtcLoggingHandlerHost* webrtc_logging_handler_host =
      new WebRtcLoggingHandlerHost(id, profile,
                                   g_browser_process->webrtc_log_uploader());
  host->AddFilter(webrtc_logging_handler_host);
  host->SetUserData(
      WebRtcLoggingHandlerHost::kWebRtcLoggingHandlerHostKey,
      std::make_unique<base::UserDataAdapter<WebRtcLoggingHandlerHost>>(
          webrtc_logging_handler_host));

  // The audio manager outlives the host, so it's safe to hand a raw pointer to
  // it to the AudioDebugRecordingsHandler, which is owned by the host.
  AudioDebugRecordingsHandler* audio_debug_recordings_handler =
      new AudioDebugRecordingsHandler(profile);
  host->SetUserData(
      AudioDebugRecordingsHandler::kAudioDebugRecordingsHandlerKey,
      std::make_unique<base::UserDataAdapter<AudioDebugRecordingsHandler>>(
          audio_debug_recordings_handler));

#if BUILDFLAG(ENABLE_NACL)
  host->AddFilter(new nacl::NaClHostMessageFilter(id, profile->IsOffTheRecord(),
                                                  profile->GetPath()));
#endif

#if defined(OS_ANDROID)
  // Data cannot be persisted if the profile is off the record.
  host->AddFilter(
      new cdm::CdmMessageFilterAndroid(!profile->IsOffTheRecord(), false));

  // Register CrashMemoryMetricsCollector to report oom related metrics.
  host->SetUserData(
      CrashMemoryMetricsCollector::kCrashMemoryMetricsCollectorKey,
      std::make_unique<CrashMemoryMetricsCollector>(host));
#endif

  Profile* original_profile = profile->GetOriginalProfile();
  RendererUpdaterFactory::GetForProfile(original_profile)
      ->InitializeRenderer(host);

  for (size_t i = 0; i < extra_parts_.size(); ++i)
    extra_parts_[i]->RenderProcessWillLaunch(host);

  service_manager::mojom::ServicePtr service;
  *service_request = mojo::MakeRequest(&service);
  service_manager::mojom::PIDReceiverPtr pid_receiver;
  service_manager::Identity renderer_identity = host->GetChildIdentity();
  ChromeService::GetInstance()->connector()->RegisterServiceInstance(
      service_manager::Identity(chrome::mojom::kRendererServiceName,
                                renderer_identity.instance_group(),
                                renderer_identity.instance_id(),
                                base::Token::CreateRandom()),
      std::move(service), mojo::MakeRequest(&pid_receiver));
}

GURL ChromeContentBrowserClient::GetEffectiveURL(
    content::BrowserContext* browser_context,
    const GURL& url) {
  Profile* profile = Profile::FromBrowserContext(browser_context);
  if (!profile)
    return url;

#if !defined(OS_ANDROID)
  // If the input |url| should be assigned to the Instant renderer, make its
  // effective URL distinct from other URLs on the search provider's domain.
  // This needs to happen even if |url| corresponds to an isolated origin; see
  // https://crbug.com/755595.
  if (search::ShouldAssignURLToInstantRenderer(url, profile))
    return search::GetEffectiveURLForInstant(url, profile);
#endif

#if BUILDFLAG(ENABLE_EXTENSIONS)
  return ChromeContentBrowserClientExtensionsPart::GetEffectiveURL(profile,
                                                                   url);
#else
  return url;
#endif
}

bool ChromeContentBrowserClient::
    ShouldCompareEffectiveURLsForSiteInstanceSelection(
        content::BrowserContext* browser_context,
        content::SiteInstance* candidate_site_instance,
        bool is_main_frame,
        const GURL& candidate_url,
        const GURL& destination_url) {
  DCHECK(browser_context);
  DCHECK(candidate_site_instance);
#if BUILDFLAG(ENABLE_EXTENSIONS)
  return ChromeContentBrowserClientExtensionsPart::
      ShouldCompareEffectiveURLsForSiteInstanceSelection(
          browser_context, candidate_site_instance, is_main_frame,
          candidate_url, destination_url);
#else
  return true;
#endif
}

bool ChromeContentBrowserClient::ShouldUseMobileFlingCurve() const {
#if defined(OS_ANDROID)
  return true;
#elif defined(OS_CHROMEOS)
  return TabletModeClient::Get() &&
         TabletModeClient::Get()->tablet_mode_enabled();
#else
  return false;
#endif  // defined(OS_ANDROID)
}

bool ChromeContentBrowserClient::ShouldUseProcessPerSite(
    content::BrowserContext* browser_context, const GURL& effective_url) {
  // Non-extension, non-Instant URLs should generally use
  // process-per-site-instance.  Because we expect to use the effective URL,
  // URLs for hosted apps (apart from bookmark apps) should have an extension
  // scheme by now.

  Profile* profile = Profile::FromBrowserContext(browser_context);
  if (!profile)
    return false;

#if !defined(OS_ANDROID)
  if (search::ShouldUseProcessPerSiteForInstantURL(effective_url, profile))
    return true;
#endif

#if BUILDFLAG(ENABLE_EXTENSIONS)
  return ChromeContentBrowserClientExtensionsPart::ShouldUseProcessPerSite(
      profile, effective_url);
#else
  return false;
#endif
}

bool ChromeContentBrowserClient::ShouldUseSpareRenderProcessHost(
    content::BrowserContext* browser_context,
    const GURL& site_url) {
  Profile* profile = Profile::FromBrowserContext(browser_context);
  if (!profile)
    return false;

#if !defined(OS_ANDROID)
  // Instant renderers should not use a spare process, because they require
  // passing switches::kInstantProcess to the renderer process when it
  // launches.  A spare process is launched earlier, before it is known which
  // navigation will use it, so it lacks this flag.
  if (search::ShouldAssignURLToInstantRenderer(site_url, profile))
    return false;
#endif

#if BUILDFLAG(ENABLE_EXTENSIONS)
  return ChromeContentBrowserClientExtensionsPart::
      ShouldUseSpareRenderProcessHost(profile, site_url);
#else
  return true;
#endif
}

bool ChromeContentBrowserClient::DoesSiteRequireDedicatedProcess(
    content::BrowserContext* browser_context,
    const GURL& effective_site_url) {
#if BUILDFLAG(ENABLE_EXTENSIONS)
  if (ChromeContentBrowserClientExtensionsPart::DoesSiteRequireDedicatedProcess(
          browser_context, effective_site_url)) {
    return true;
  }
#endif
  return false;
}

// TODO(creis, nick): https://crbug.com/160576 describes a weakness in our
// origin-lock enforcement, where we don't have a way to efficiently know
// effective URLs on the IO thread, and wind up killing processes that e.g.
// request cookies for their actual URL. This whole function (and its
// ExtensionsPart) should be removed once we add that ability to the IO thread.
bool ChromeContentBrowserClient::ShouldLockToOrigin(
    content::BrowserContext* browser_context,
    const GURL& effective_site_url) {
  // Origin lock to the search scheme would kill processes upon legitimate
  // requests for cookies from the search engine's domain.
  if (effective_site_url.SchemeIs(chrome::kChromeSearchScheme))
    return false;

#if BUILDFLAG(ENABLE_EXTENSIONS)
  if (!ChromeContentBrowserClientExtensionsPart::ShouldLockToOrigin(
          browser_context, effective_site_url)) {
    return false;
  }
#endif
  return true;
}

const char*
ChromeContentBrowserClient::GetInitiatorSchemeBypassingDocumentBlocking() {
#if BUILDFLAG(ENABLE_EXTENSIONS)
  // Don't block responses for extension processes or for content scripts.
  // TODO(creis): When every extension fetch (including content scripts) has
  // been made to go through an extension-specific URLLoaderFactory, this
  // mechanism ought to work by enumerating the host permissions from the
  // extension manifest, and forwarding them on to the network service while
  // brokering the URLLoaderFactory.
  return extensions::kExtensionScheme;
#else
  return nullptr;
#endif
}

void ChromeContentBrowserClient::LogInitiatorSchemeBypassingDocumentBlocking(
    const url::Origin& initiator_origin,
    int render_process_id,
    content::ResourceType resource_type) {
#if BUILDFLAG(ENABLE_EXTENSIONS)
  ChromeContentBrowserClientExtensionsPart::
      LogInitiatorSchemeBypassingDocumentBlocking(
          initiator_origin, render_process_id, resource_type);
#endif
}

network::mojom::URLLoaderFactoryPtrInfo
ChromeContentBrowserClient::CreateURLLoaderFactoryForNetworkRequests(
    content::RenderProcessHost* process,
    network::mojom::NetworkContext* network_context,
    network::mojom::TrustedURLLoaderHeaderClientPtrInfo* header_client,
    const url::Origin& request_initiator) {
#if BUILDFLAG(ENABLE_EXTENSIONS)
  return ChromeContentBrowserClientExtensionsPart::
      CreateURLLoaderFactoryForNetworkRequests(
          process, network_context, header_client, request_initiator);
#else
  return network::mojom::URLLoaderFactoryPtrInfo();
#endif
}

// These are treated as WebUI schemes but do not get WebUI bindings. Also,
// view-source is allowed for these schemes.
void ChromeContentBrowserClient::GetAdditionalWebUISchemes(
    std::vector<std::string>* additional_schemes) {
  additional_schemes->push_back(chrome::kChromeSearchScheme);
  additional_schemes->push_back(dom_distiller::kDomDistillerScheme);
  additional_schemes->push_back(content::kChromeDevToolsScheme);
}

void ChromeContentBrowserClient::GetAdditionalViewSourceSchemes(
    std::vector<std::string>* additional_schemes) {
  GetAdditionalWebUISchemes(additional_schemes);

#if BUILDFLAG(ENABLE_EXTENSIONS)
  additional_schemes->push_back(extensions::kExtensionScheme);
#endif
}

bool ChromeContentBrowserClient::LogWebUIUrl(const GURL& web_ui_url) const {
  return webui::LogWebUIUrl(web_ui_url);
}

bool ChromeContentBrowserClient::IsWebUIAllowedToMakeNetworkRequests(
    const url::Origin& origin) {
  return ChromeWebUIControllerFactory::IsWebUIAllowedToMakeNetworkRequests(
      origin);
}

bool ChromeContentBrowserClient::IsHandledURL(const GURL& url) {
  return ProfileIOData::IsHandledURL(url);
}

bool ChromeContentBrowserClient::CanCommitURL(
    content::RenderProcessHost* process_host,
    const GURL& url) {
#if BUILDFLAG(ENABLE_EXTENSIONS)
  return ChromeContentBrowserClientExtensionsPart::CanCommitURL(
      process_host, url);
#else
  return true;
#endif
}

bool ChromeContentBrowserClient::ShouldAllowOpenURL(
    content::SiteInstance* site_instance, const GURL& url) {
#if BUILDFLAG(ENABLE_EXTENSIONS)
  bool result;
  if (ChromeContentBrowserClientExtensionsPart::ShouldAllowOpenURL(
          site_instance, url, &result))
    return result;
#endif

  // Do not allow chrome://chrome-signin navigate to other chrome:// URLs, since
  // the signin page may host untrusted web content.
  GURL from_url = site_instance->GetSiteURL();
  if (from_url.GetOrigin().spec() == chrome::kChromeUIChromeSigninURL &&
      url.SchemeIs(content::kChromeUIScheme) &&
      url.host_piece() != chrome::kChromeUIChromeSigninHost) {
    VLOG(1) << "Blocked navigation to " << url.spec() << " from "
            << chrome::kChromeUIChromeSigninURL;
    return false;
  }

  return true;
}

namespace {

// Returns whether a SiteInstance holds a NTP. TODO(mastiz): This
// really really really needs to be moved to a shared place where all the code
// that needs to know this can access it. See http://crbug.com/624410.
bool IsNTPSiteInstance(SiteInstance* site_instance) {
  // While using SiteInstance::GetSiteURL() is unreliable and the wrong thing to
  // use for making security decisions 99.44% of the time, for detecting the NTP
  // it is reliable and the correct way. Again, see http://crbug.com/624410.
  return site_instance &&
         site_instance->GetSiteURL().SchemeIs(chrome::kChromeSearchScheme) &&
         (site_instance->GetSiteURL().host_piece() ==
              chrome::kChromeSearchRemoteNtpHost ||
          site_instance->GetSiteURL().host_piece() ==
              chrome::kChromeSearchLocalNtpHost);
}

}  // namespace

void ChromeContentBrowserClient::OverrideNavigationParams(
    SiteInstance* site_instance,
    ui::PageTransition* transition,
    bool* is_renderer_initiated,
    content::Referrer* referrer) {
  DCHECK(transition);
  DCHECK(is_renderer_initiated);
  DCHECK(referrer);
  // TODO(crbug.com/624410): Factor the predicate to identify a URL as an NTP
  // to a shared library.
  if (IsNTPSiteInstance(site_instance) &&
      ui::PageTransitionCoreTypeIs(*transition, ui::PAGE_TRANSITION_LINK)) {
    // Use AUTO_BOOKMARK for clicks on tiles of the new tab page, consistently
    // with native implementations like Android's.
    *transition = ui::PAGE_TRANSITION_AUTO_BOOKMARK;
    *is_renderer_initiated = false;
    *referrer = content::Referrer();
  }

#if BUILDFLAG(ENABLE_EXTENSIONS)
  ChromeContentBrowserClientExtensionsPart::OverrideNavigationParams(
      site_instance, transition, is_renderer_initiated, referrer);
#endif
}

bool ChromeContentBrowserClient::ShouldStayInParentProcessForNTP(
    const GURL& url,
    SiteInstance* parent_site_instance) {
  return url.SchemeIs(chrome::kChromeSearchScheme) &&
         IsNTPSiteInstance(parent_site_instance);
}

bool ChromeContentBrowserClient::IsSuitableHost(
    content::RenderProcessHost* process_host,
    const GURL& site_url) {
  Profile* profile =
      Profile::FromBrowserContext(process_host->GetBrowserContext());
  // This may be NULL during tests. In that case, just assume any site can
  // share any host.
  if (!profile)
    return true;

#if !defined(OS_ANDROID)
  // Instant URLs should only be in the instant process and instant process
  // should only have Instant URLs.
  InstantService* instant_service =
      InstantServiceFactory::GetForProfile(profile);
  if (instant_service) {
    bool is_instant_process = instant_service->IsInstantProcess(
        process_host->GetID());
    bool should_be_in_instant_process =
        search::ShouldAssignURLToInstantRenderer(site_url, profile);
    if (is_instant_process || should_be_in_instant_process)
      return is_instant_process && should_be_in_instant_process;
  }
#endif

#if BUILDFLAG(ENABLE_EXTENSIONS)
  return ChromeContentBrowserClientExtensionsPart::IsSuitableHost(
      profile, process_host, site_url);
#else
  return true;
#endif
}

bool ChromeContentBrowserClient::MayReuseHost(
    content::RenderProcessHost* process_host) {
  // If there is currently a prerender in progress for the host provided,
  // it may not be shared. We require prerenders to be by themselves in a
  // separate process so that we can monitor their resource usage.
  prerender::PrerenderManager* prerender_manager =
      prerender::PrerenderManagerFactory::GetForBrowserContext(
          process_host->GetBrowserContext());
  if (prerender_manager &&
      !prerender_manager->MayReuseProcessHost(process_host)) {
    return false;
  }

  return true;
}

bool ChromeContentBrowserClient::ShouldTryToUseExistingProcessHost(
    content::BrowserContext* browser_context, const GURL& url) {
  // It has to be a valid URL for us to check for an extension.
  if (!url.is_valid())
    return false;

#if BUILDFLAG(ENABLE_EXTENSIONS)
  Profile* profile = Profile::FromBrowserContext(browser_context);
  return ChromeContentBrowserClientExtensionsPart::
      ShouldTryToUseExistingProcessHost(
          profile, url);
#else
  return false;
#endif
}

bool ChromeContentBrowserClient::ShouldSubframesTryToReuseExistingProcess(
    content::RenderFrameHost* main_frame) {
#if BUILDFLAG(ENABLE_EXTENSIONS)
  return ChromeContentBrowserClientExtensionsPart::
      ShouldSubframesTryToReuseExistingProcess(main_frame);
#else
  return true;
#endif
}

void ChromeContentBrowserClient::SiteInstanceGotProcess(
    SiteInstance* site_instance) {
  CHECK(site_instance->HasProcess());

  Profile* profile = Profile::FromBrowserContext(
      site_instance->GetBrowserContext());
  if (!profile)
    return;

#if !defined(OS_ANDROID)
  // Remember the ID of the Instant process to signal the renderer process
  // on startup in |AppendExtraCommandLineSwitches| below.
  if (search::ShouldAssignURLToInstantRenderer(site_instance->GetSiteURL(),
                                               profile)) {
    InstantService* instant_service =
        InstantServiceFactory::GetForProfile(profile);
    if (instant_service)
      instant_service->AddInstantProcess(site_instance->GetProcess()->GetID());
  }
#endif

  for (size_t i = 0; i < extra_parts_.size(); ++i)
    extra_parts_[i]->SiteInstanceGotProcess(site_instance);
}

void ChromeContentBrowserClient::SiteInstanceDeleting(
    SiteInstance* site_instance) {
  if (!site_instance->HasProcess())
    return;

  for (size_t i = 0; i < extra_parts_.size(); ++i)
    extra_parts_[i]->SiteInstanceDeleting(site_instance);
}

bool ChromeContentBrowserClient::ShouldSwapBrowsingInstancesForNavigation(
    SiteInstance* site_instance,
    const GURL& current_url,
    const GURL& new_url) {
#if BUILDFLAG(ENABLE_EXTENSIONS)
  return ChromeContentBrowserClientExtensionsPart::
      ShouldSwapBrowsingInstancesForNavigation(
          site_instance, current_url, new_url);
#else
  return false;
#endif
}

bool ChromeContentBrowserClient::ShouldIsolateErrorPage(bool in_main_frame) {
  // TODO(nasko): Consider supporting error page isolation in subframes if
  // Site Isolation is enabled.
  return in_main_frame;
}

bool ChromeContentBrowserClient::ShouldAssignSiteForURL(const GURL& url) {
  return !url.SchemeIs(chrome::kChromeNativeScheme);
}

std::vector<url::Origin>
ChromeContentBrowserClient::GetOriginsRequiringDedicatedProcess() {
  std::vector<url::Origin> isolated_origin_list;

// Sign-in process isolation is not needed on Android, see
// https://crbug.com/739418.
#if !defined(OS_ANDROID)
  isolated_origin_list.emplace_back(
      url::Origin::Create(GaiaUrls::GetInstance()->gaia_url()));
#endif

  return isolated_origin_list;
}

bool ChromeContentBrowserClient::ShouldEnableStrictSiteIsolation() {
  return base::FeatureList::IsEnabled(features::kSitePerProcess);
}

bool ChromeContentBrowserClient::ShouldDisableSiteIsolation() {
  constexpr int kDefaultMemoryThresholdMb = 1024;

  // TODO(acolwell): Rename feature since it now affects more than just the
  // site-per-process case.
  if (base::FeatureList::IsEnabled(
          features::kSitePerProcessOnlyForHighMemoryClients)) {
    int memory_threshold_mb = base::GetFieldTrialParamByFeatureAsInt(
        features::kSitePerProcessOnlyForHighMemoryClients,
        features::kSitePerProcessOnlyForHighMemoryClientsParamName,
        kDefaultMemoryThresholdMb);
    return base::SysInfo::AmountOfPhysicalMemoryMB() <= memory_threshold_mb;
  }

#if defined(OS_ANDROID)
  if (base::SysInfo::AmountOfPhysicalMemoryMB() <= kDefaultMemoryThresholdMb) {
    return true;
  }
#endif

  return false;
}

bool ChromeContentBrowserClient::IsFileAccessAllowed(
    const base::FilePath& path,
    const base::FilePath& absolute_path,
    const base::FilePath& profile_path) {
  return ChromeNetworkDelegate::IsAccessAllowed(path, absolute_path,
                                                profile_path);
}

namespace {

bool IsAutoReloadEnabled() {
  const base::CommandLine& browser_command_line =
      *base::CommandLine::ForCurrentProcess();
  if (browser_command_line.HasSwitch(switches::kEnableOfflineAutoReload))
    return true;
  if (browser_command_line.HasSwitch(switches::kDisableOfflineAutoReload))
    return false;
  return true;
}

bool IsAutoReloadVisibleOnlyEnabled() {
  const base::CommandLine& browser_command_line =
      *base::CommandLine::ForCurrentProcess();
  if (browser_command_line.HasSwitch(
      switches::kEnableOfflineAutoReloadVisibleOnly)) {
    return true;
  }
  if (browser_command_line.HasSwitch(
      switches::kDisableOfflineAutoReloadVisibleOnly)) {
    return false;
  }
  return true;
}

void MaybeAppendBlinkSettingsSwitchForFieldTrial(
    const base::CommandLine& browser_command_line,
    base::CommandLine* command_line) {
  // List of field trials that modify the blink-settings command line flag. No
  // two field trials in the list should specify the same keys, otherwise one
  // field trial may overwrite another. See Source/core/frame/Settings.in in
  // Blink for the list of valid keys.
  static const char* const kBlinkSettingsFieldTrials[] = {
      // Keys: disallowFetchForDocWrittenScriptsInMainFrame
      //       disallowFetchForDocWrittenScriptsInMainFrameOnSlowConnections
      //       disallowFetchForDocWrittenScriptsInMainFrameIfEffectively2G
      "DisallowFetchForDocWrittenScriptsInMainFrame",
  };

  std::vector<std::string> blink_settings;
  for (const char* field_trial_name : kBlinkSettingsFieldTrials) {
    // Each blink-settings field trial should include a forcing_flag group,
    // to make sure that clients that specify the blink-settings flag on the
    // command line are excluded from the experiment groups. To make
    // sure we assign clients that specify this flag to the forcing_flag
    // group, we must call GetVariationParams for each field trial first
    // (for example, before checking HasSwitch() and returning), since
    // GetVariationParams has the side-effect of assigning the client to
    // a field trial group.
    std::map<std::string, std::string> params;
    if (variations::GetVariationParams(field_trial_name, &params)) {
      for (const auto& param : params) {
        blink_settings.push_back(base::StringPrintf(
            "%s=%s", param.first.c_str(), param.second.c_str()));
      }
    }
  }

  if (blink_settings.empty()) {
    return;
  }

  if (browser_command_line.HasSwitch(switches::kBlinkSettings) ||
      command_line->HasSwitch(switches::kBlinkSettings)) {
    // The field trials should be configured to force users that specify the
    // blink-settings flag into a group with no params, and we return
    // above if no params were specified, so it's an error if we reach
    // this point.
    LOG(WARNING) << "Received field trial params, "
                    "but blink-settings switch already specified.";
    return;
  }

  command_line->AppendSwitchASCII(switches::kBlinkSettings,
                                  base::JoinString(blink_settings, ","));
}

#if defined(OS_ANDROID)
template <typename Interface>
void ForwardToJavaFrameRegistry(
    mojo::InterfaceRequest<Interface> request,
    content::RenderFrameHost* render_frame_host) {
  render_frame_host->GetJavaInterfaces()->GetInterface(std::move(request));
}

template <typename Interface>
void ForwardToJavaWebContentsRegistry(
    mojo::InterfaceRequest<Interface> request,
    content::RenderFrameHost* render_frame_host) {
  content::WebContents* contents =
      content::WebContents::FromRenderFrameHost(render_frame_host);
  if (contents)
    contents->GetJavaInterfaces()->GetInterface(std::move(request));
}
#endif

}  // namespace

void ChromeContentBrowserClient::AppendExtraCommandLineSwitches(
    base::CommandLine* command_line,
    int child_process_id) {
#if defined(OS_MACOSX)
  std::unique_ptr<metrics::ClientInfo> client_info =
      GoogleUpdateSettings::LoadMetricsClientInfo();
  if (client_info) {
    command_line->AppendSwitchASCII(switches::kMetricsClientID,
                                    client_info->client_id);
  }
#elif defined(OS_POSIX)
#if defined(OS_ANDROID)
  bool enable_crash_reporter = true;
#else
  bool enable_crash_reporter = breakpad::IsCrashReporterEnabled();
#endif
  if (enable_crash_reporter) {
    std::string switch_value;
    std::unique_ptr<metrics::ClientInfo> client_info =
        GoogleUpdateSettings::LoadMetricsClientInfo();
    if (client_info)
      switch_value = client_info->client_id;
    switch_value.push_back(',');
    switch_value.append(chrome::GetChannelName());
    command_line->AppendSwitchASCII(switches::kEnableCrashReporter,
                                    switch_value);
  }
#endif

  if (logging::DialogsAreSuppressed())
    command_line->AppendSwitch(switches::kNoErrorDialogs);

  std::string process_type =
      command_line->GetSwitchValueASCII(switches::kProcessType);
  const base::CommandLine& browser_command_line =
      *base::CommandLine::ForCurrentProcess();

  static const char* const kCommonSwitchNames[] = {
    switches::kUserAgent,
    switches::kUserDataDir,  // Make logs go to the right file.
  };
  command_line->CopySwitchesFrom(browser_command_line, kCommonSwitchNames,
                                 arraysize(kCommonSwitchNames));

  static const char* const kDinosaurEasterEggSwitches[] = {
      error_page::switches::kDisableDinosaurEasterEgg,
  };
  command_line->CopySwitchesFrom(browser_command_line,
                                 kDinosaurEasterEggSwitches,
                                 arraysize(kDinosaurEasterEggSwitches));

#if defined(OS_CHROMEOS)
  // On Chrome OS need to pass primary user homedir (in multi-profiles session).
  base::FilePath homedir;
  base::PathService::Get(base::DIR_HOME, &homedir);
  command_line->AppendSwitchASCII(chromeos::switches::kHomedir,
                                  homedir.value().c_str());
#endif

  if (process_type == switches::kRendererProcess) {
    content::RenderProcessHost* process =
        content::RenderProcessHost::FromID(child_process_id);
    Profile* profile =
        process ? Profile::FromBrowserContext(process->GetBrowserContext())
                : NULL;
    for (size_t i = 0; i < extra_parts_.size(); ++i) {
      extra_parts_[i]->AppendExtraRendererCommandLineSwitches(
          command_line, process, profile);
    }

#if defined(OS_CHROMEOS)
    const std::string& login_profile =
        browser_command_line.GetSwitchValueASCII(
            chromeos::switches::kLoginProfile);
    if (!login_profile.empty())
      command_line->AppendSwitchASCII(
          chromeos::switches::kLoginProfile, login_profile);
#endif

    MaybeCopyDisableWebRtcEncryptionSwitch(command_line,
                                           browser_command_line,
                                           chrome::GetChannel());

    if (process) {
      PrefService* prefs = profile->GetPrefs();
      // Currently this pref is only registered if applied via a policy.
      if (prefs->HasPrefPath(prefs::kDisable3DAPIs) &&
          prefs->GetBoolean(prefs::kDisable3DAPIs)) {
        // Turn this policy into a command line switch.
        command_line->AppendSwitch(switches::kDisable3DAPIs);
      }

      const base::ListValue* switches =
          prefs->GetList(prefs::kEnableDeprecatedWebPlatformFeatures);
      if (switches) {
        // Enable any deprecated features that have been re-enabled by policy.
        for (auto it = switches->begin(); it != switches->end(); ++it) {
          std::string switch_to_enable;
          if (it->GetAsString(&switch_to_enable))
            command_line->AppendSwitch(switch_to_enable);
        }
      }

      // Disable client-side phishing detection in the renderer if it is
      // disabled in the Profile preferences or the browser process.
      if (!prefs->GetBoolean(prefs::kSafeBrowsingEnabled) ||
          !g_browser_process->safe_browsing_detection_service()) {
        command_line->AppendSwitch(
            switches::kDisableClientSidePhishingDetection);
      }

      if (prefs->GetBoolean(prefs::kPrintPreviewDisabled))
        command_line->AppendSwitch(switches::kDisablePrintPreview);

#if !defined(OS_ANDROID)
      InstantService* instant_service =
          InstantServiceFactory::GetForProfile(profile);
      if (instant_service &&
          instant_service->IsInstantProcess(process->GetID())) {
        command_line->AppendSwitch(switches::kInstantProcess);
      }
#endif

      if (prefs->HasPrefPath(prefs::kAllowDinosaurEasterEgg) &&
          !prefs->GetBoolean(prefs::kAllowDinosaurEasterEgg)) {
        command_line->AppendSwitch(
            error_page::switches::kDisableDinosaurEasterEgg);
      }

      if (prefs->HasPrefPath(prefs::kUnsafelyTreatInsecureOriginAsSecure)) {
        command_line->AppendSwitchASCII(
            switches::kUnsafelyTreatInsecureOriginAsSecure,
            prefs->GetString(prefs::kUnsafelyTreatInsecureOriginAsSecure));
      }
    }

    if (IsAutoReloadEnabled())
      command_line->AppendSwitch(switches::kEnableOfflineAutoReload);
    if (IsAutoReloadVisibleOnlyEnabled()) {
      command_line->AppendSwitch(
          switches::kEnableOfflineAutoReloadVisibleOnly);
    }

    {
      // Enable showing a saved copy if the user explicitly enabled it.
      // Note that as far as the renderer is concerned, the feature is
      // enabled if-and-only-if one of the kEnableShowSavedCopy* switches
      // is on the command line; the yes/no/default behavior is only at
      // the browser command line level.

      // Command line switches override
      const std::string& show_saved_copy_value =
          browser_command_line.GetSwitchValueASCII(
              error_page::switches::kShowSavedCopy);
      if (show_saved_copy_value ==
              error_page::switches::kEnableShowSavedCopyPrimary ||
          show_saved_copy_value ==
              error_page::switches::kEnableShowSavedCopySecondary ||
          show_saved_copy_value ==
              error_page::switches::kDisableShowSavedCopy) {
        command_line->AppendSwitchASCII(error_page::switches::kShowSavedCopy,
                                        show_saved_copy_value);
      }
    }
    MaybeAppendBlinkSettingsSwitchForFieldTrial(
        browser_command_line, command_line);

#if defined(OS_ANDROID)
    // If the platform is Android, force the distillability service on.
    command_line->AppendSwitch(switches::kEnableDistillabilityService);
#endif

    // Please keep this in alphabetical order.
    static const char* const kSwitchNames[] = {
      autofill::switches::kEnableSuggestionsWithSubstringMatch,
      autofill::switches::kIgnoreAutocompleteOffForAutofill,
      autofill::switches::kShowAutofillSignatures,
#if BUILDFLAG(ENABLE_EXTENSIONS)
      extensions::switches::kAllowHTTPBackgroundPage,
      extensions::switches::kAllowLegacyExtensionManifests,
      extensions::switches::kDisableExtensionsHttpThrottling,
      extensions::switches::kEnableEmbeddedExtensionOptions,
      extensions::switches::kEnableExperimentalExtensionApis,
      extensions::switches::kExtensionsOnChromeURLs,
      extensions::switches::kSetExtensionThrottleTestParams,  // For tests only.
      extensions::switches::kWhitelistedExtensionID,
#endif
      switches::kAllowInsecureLocalhost,
      switches::kAppsGalleryURL,
      switches::kCloudPrintURL,
      switches::kCloudPrintXmppEndpoint,
      switches::kDisableBundledPpapiFlash,
      switches::kDisableCastStreamingHWEncoding,
      switches::kDisableJavaScriptHarmonyShipping,
      variations::switches::kEnableBenchmarking,
      switches::kEnableDistillabilityService,
      switches::kEnableNaCl,
#if BUILDFLAG(ENABLE_NACL)
      switches::kEnableNaClDebug,
      switches::kEnableNaClNonSfiMode,
#endif
      switches::kEnableNetBenchmarking,
#if BUILDFLAG(ENABLE_NACL)
      switches::kForcePNaClSubzero,
#endif
      switches::kForceUIDirection,
      switches::kJavaScriptHarmony,
      switches::kOriginTrialDisabledFeatures,
      switches::kOriginTrialDisabledTokens,
      switches::kOriginTrialPublicKey,
      switches::kPpapiFlashArgs,
      switches::kPpapiFlashPath,
      switches::kPpapiFlashVersion,
      switches::kReaderModeHeuristics,
      translate::switches::kTranslateSecurityOrigin,
    };

    command_line->CopySwitchesFrom(browser_command_line, kSwitchNames,
                                   arraysize(kSwitchNames));
  } else if (process_type == switches::kUtilityProcess) {
#if BUILDFLAG(ENABLE_EXTENSIONS)
    static const char* const kSwitchNames[] = {
      extensions::switches::kAllowHTTPBackgroundPage,
      extensions::switches::kEnableExperimentalExtensionApis,
      extensions::switches::kExtensionsOnChromeURLs,
      extensions::switches::kWhitelistedExtensionID,
    };

    command_line->CopySwitchesFrom(browser_command_line, kSwitchNames,
                                   arraysize(kSwitchNames));
#endif
  } else if (process_type == service_manager::switches::kZygoteProcess) {
    static const char* const kSwitchNames[] = {
      // Load (in-process) Pepper plugins in-process in the zygote pre-sandbox.
      switches::kDisableBundledPpapiFlash,
#if BUILDFLAG(ENABLE_NACL)
      switches::kEnableNaClDebug,
      switches::kEnableNaClNonSfiMode,
      switches::kForcePNaClSubzero,
      switches::kNaClDangerousNoSandboxNonSfi,
#endif
      switches::kPpapiFlashPath,
      switches::kPpapiFlashVersion,
    };

    command_line->CopySwitchesFrom(browser_command_line, kSwitchNames,
                                   arraysize(kSwitchNames));
  } else if (process_type == switches::kGpuProcess) {
    // If --ignore-gpu-blacklist is passed in, don't send in crash reports
    // because GPU is expected to be unreliable.
    if (browser_command_line.HasSwitch(switches::kIgnoreGpuBlacklist) &&
        !command_line->HasSwitch(switches::kDisableBreakpad))
      command_line->AppendSwitch(switches::kDisableBreakpad);
  }

  StackSamplingConfiguration::Get()->AppendCommandLineSwitchForChildProcess(
      process_type,
      command_line);
}

void ChromeContentBrowserClient::AdjustUtilityServiceProcessCommandLine(
    const service_manager::Identity& identity,
    base::CommandLine* command_line) {
#if defined(OS_CHROMEOS)
  bool copy_switches = false;
  if (identity.name() == ash::mojom::kServiceName) {
    copy_switches = true;
    command_line->AppendSwitch(switches::kMessageLoopTypeUi);
  }
  if (ash_service_registry::IsAshRelatedServiceName(identity.name())) {
    // Ash services also need command line flags, as some flags are used to
    // configure the compositor.
    copy_switches = true;
    command_line->AppendSwitchASCII(switches::kMashServiceName,
                                    identity.name());
  }
  // TODO(crbug.com/906954): whitelist flags to copy.
  if (copy_switches) {
    for (const auto& sw : base::CommandLine::ForCurrentProcess()->GetSwitches())
      command_line->AppendSwitchNative(sw.first, sw.second);
  }
#endif

#if defined(OS_MACOSX)
  // On Mac, the video-capture and audio services require a CFRunLoop, provided
  // by a UI message loop, to run AVFoundation and CoreAudio code.
  // See https://crbug.com/834581
  if (identity.name() == video_capture::mojom::kServiceName ||
      identity.name() == audio::mojom::kServiceName)
    command_line->AppendSwitch(switches::kMessageLoopTypeUi);
#endif
}

std::string ChromeContentBrowserClient::GetApplicationLocale() {
  if (BrowserThread::CurrentlyOn(BrowserThread::IO))
    return GetIOThreadApplicationLocale();
  return g_browser_process->GetApplicationLocale();
}

std::string ChromeContentBrowserClient::GetAcceptLangs(
    content::BrowserContext* context) {
  Profile* profile = Profile::FromBrowserContext(context);
  return profile->GetPrefs()->GetString(prefs::kAcceptLanguages);
}

const gfx::ImageSkia* ChromeContentBrowserClient::GetDefaultFavicon() {
  ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
  return rb.GetNativeImageNamed(IDR_DEFAULT_FAVICON).ToImageSkia();
}

bool ChromeContentBrowserClient::IsDataSaverEnabled(
    content::BrowserContext* browser_context) {
  Profile* profile = Profile::FromBrowserContext(browser_context);
  if (!profile)
    return false;
  PrefService* prefs = profile->GetPrefs();
  return prefs && prefs->GetBoolean(prefs::kDataSaverEnabled);
}

void ChromeContentBrowserClient::UpdateRendererPreferencesForWorker(
    content::BrowserContext* browser_context,
    content::RendererPreferences* out_prefs) {
  DCHECK(browser_context);
  DCHECK(out_prefs);
  renderer_preferences_util::UpdateFromSystemSettings(
      out_prefs, Profile::FromBrowserContext(browser_context));
}

void ChromeContentBrowserClient::NavigationRequestStarted(
    int frame_tree_node_id,
    const GURL& url,
    std::unique_ptr<net::HttpRequestHeaders>* extra_headers,
    int* extra_load_flags) {
  WebContents* web_contents =
      WebContents::FromFrameTreeNodeId(frame_tree_node_id);
  content::BrowserContext* browser_context = web_contents->GetBrowserContext();
  *extra_headers =
      client_hints::GetAdditionalNavigationRequestClientHintsHeaders(
          browser_context, url);
  prerender::PrerenderContents* prerender_contents =
      prerender::PrerenderContents::FromWebContents(web_contents);
  if (prerender_contents &&
      prerender_contents->prerender_mode() == prerender::PREFETCH_ONLY) {
    *extra_load_flags = net::LOAD_PREFETCH;
    if (*extra_headers == nullptr)
      *extra_headers = std::make_unique<net::HttpRequestHeaders>();
    extra_headers->get()->SetHeader(prerender::kPurposeHeaderName,
                                    prerender::kPurposeHeaderValue);
  }

  if (!browser_context->IsOffTheRecord()) {
    // Add policy headers for non-incognito requests.
    policy::PolicyHeaderService* policy_header_service =
        policy::PolicyHeaderServiceFactory::GetForBrowserContext(
            browser_context);
    if (policy_header_service)
      policy_header_service->AddPolicyHeaders(url, extra_headers);
  }
}

void ChromeContentBrowserClient::NavigationRequestRedirected(
    int frame_tree_node_id,
    const GURL& url,
    base::Optional<net::HttpRequestHeaders>* modified_request_headers) {
  WebContents* web_contents =
      WebContents::FromFrameTreeNodeId(frame_tree_node_id);
  content::BrowserContext* browser_context = web_contents->GetBrowserContext();

  if (!browser_context->IsOffTheRecord()) {
    // Add policy headers for non-incognito requests.
    policy::PolicyHeaderService* policy_header_service =
        policy::PolicyHeaderServiceFactory::GetForBrowserContext(
            browser_context);
    if (policy_header_service) {
      std::unique_ptr<net::HttpRequestHeaders> extra_headers;
      policy_header_service->AddPolicyHeaders(url, &extra_headers);
      if (extra_headers)
        *modified_request_headers = std::move(*extra_headers);
    }
  }

  std::unique_ptr<net::HttpRequestHeaders> client_hints_extra_headers =
      client_hints::GetAdditionalNavigationRequestClientHintsHeaders(
          browser_context, url);
  if (client_hints_extra_headers) {
    if (!modified_request_headers->has_value())
      *modified_request_headers = net::HttpRequestHeaders();
    modified_request_headers->value().MergeFrom(*client_hints_extra_headers);
  }
}

bool ChromeContentBrowserClient::AllowAppCache(
    const GURL& manifest_url,
    const GURL& first_party,
    content::ResourceContext* context) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  ProfileIOData* io_data = ProfileIOData::FromResourceContext(context);
  return io_data->GetCookieSettings()->IsCookieAccessAllowed(manifest_url,
                                                             first_party);
}

bool ChromeContentBrowserClient::AllowServiceWorker(
    const GURL& scope,
    const GURL& first_party_url,
    content::ResourceContext* context,
    base::RepeatingCallback<content::WebContents*()> wc_getter) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);

#if BUILDFLAG(ENABLE_EXTENSIONS)
  // Check if this is an extension-related service worker, and, if so, if it's
  // allowed (this can return false if, e.g., the extension is disabled).
  // If it's not allowed, return immediately. We deliberately do *not* report
  // to the TabSpecificContentSettings, since the service worker is blocked
  // because of the extension, rather than because of the user's content
  // settings.
  if (!ChromeContentBrowserClientExtensionsPart::AllowServiceWorker(
          scope, first_party_url, context)) {
    return false;
  }
#endif

  ProfileIOData* io_data = ProfileIOData::FromResourceContext(context);

  // Check if JavaScript is allowed.
  content_settings::SettingInfo info;
  std::unique_ptr<base::Value> value =
      io_data->GetHostContentSettingsMap()->GetWebsiteSetting(
          first_party_url, first_party_url, CONTENT_SETTINGS_TYPE_JAVASCRIPT,
          std::string(), &info);
  ContentSetting setting = content_settings::ValueToContentSetting(value.get());
  bool allow_javascript = (setting == CONTENT_SETTING_ALLOW);

  // Check if cookies are allowed.
  bool allow_serviceworker =
      io_data->GetCookieSettings()->IsCookieAccessAllowed(scope,
                                                          first_party_url);
  // Record access to database for potential display in UI.
  // Only post the task if this is for a specific tab.
  if (!wc_getter.is_null()) {
    base::PostTaskWithTraits(
        FROM_HERE, {BrowserThread::UI},
        base::BindOnce(&TabSpecificContentSettings::ServiceWorkerAccessed,
                       std::move(wc_getter), scope, !allow_javascript,
                       !allow_serviceworker));
  }
  return allow_javascript && allow_serviceworker;
}

bool ChromeContentBrowserClient::AllowSharedWorker(
    const GURL& worker_url,
    const GURL& main_frame_url,
    const std::string& name,
    const url::Origin& constructor_origin,
    content::BrowserContext* context,
    int render_process_id,
    int render_frame_id) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);

  // Check if cookies are allowed.
  bool allow =
      CookieSettingsFactory::GetForProfile(Profile::FromBrowserContext(context))
          ->IsCookieAccessAllowed(worker_url, main_frame_url);

  TabSpecificContentSettings::SharedWorkerAccessed(
      render_process_id, render_frame_id, worker_url, name, constructor_origin,
      !allow);
  return allow;
}

bool ChromeContentBrowserClient::AllowGetCookie(
    const GURL& url,
    const GURL& first_party,
    const net::CookieList& cookie_list,
    content::ResourceContext* context,
    int render_process_id,
    int render_frame_id) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  ProfileIOData* io_data = ProfileIOData::FromResourceContext(context);
  bool allow =
      io_data->GetCookieSettings()->IsCookieAccessAllowed(url, first_party);
  OnCookiesRead(render_process_id, render_frame_id, url, first_party,
                cookie_list, !allow);

  return allow;
}

bool ChromeContentBrowserClient::AllowSetCookie(
    const GURL& url,
    const GURL& first_party,
    const net::CanonicalCookie& cookie,
    content::ResourceContext* context,
    int render_process_id,
    int render_frame_id) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  ProfileIOData* io_data = ProfileIOData::FromResourceContext(context);
  content_settings::CookieSettings* cookie_settings =
      io_data->GetCookieSettings();
  bool allow = cookie_settings->IsCookieAccessAllowed(url, first_party);

  OnCookieChange(render_process_id, render_frame_id, url, first_party, cookie,
                 !allow);
  return allow;
}

void ChromeContentBrowserClient::OnCookiesRead(
    int process_id,
    int routing_id,
    const GURL& url,
    const GURL& first_party_url,
    const net::CookieList& cookie_list,
    bool blocked_by_policy) {
  base::RepeatingCallback<content::WebContents*(void)> wc_getter =
      base::BindRepeating(&GetWebContentsFromProcessAndFrameId, process_id,
                          routing_id);
  base::PostTaskWithTraits(
      FROM_HERE, {BrowserThread::UI},
      base::BindOnce(&TabSpecificContentSettings::CookiesRead, wc_getter, url,
                     first_party_url, cookie_list, blocked_by_policy));
}

void ChromeContentBrowserClient::OnCookieChange(
    int process_id,
    int routing_id,
    const GURL& url,
    const GURL& first_party_url,
    const net::CanonicalCookie& cookie,
    bool blocked_by_policy) {
  base::RepeatingCallback<content::WebContents*(void)> wc_getter =
      base::BindRepeating(&GetWebContentsFromProcessAndFrameId, process_id,
                          routing_id);
  base::PostTaskWithTraits(
      FROM_HERE, {BrowserThread::UI},
      base::BindOnce(&TabSpecificContentSettings::CookieChanged, wc_getter, url,
                     first_party_url, cookie, blocked_by_policy));
}

void ChromeContentBrowserClient::AllowWorkerFileSystem(
    const GURL& url,
    content::ResourceContext* context,
    const std::vector<content::GlobalFrameRoutingId>& render_frames,
    base::Callback<void(bool)> callback) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  ProfileIOData* io_data = ProfileIOData::FromResourceContext(context);
  content_settings::CookieSettings* cookie_settings =
      io_data->GetCookieSettings();
  bool allow = cookie_settings->IsCookieAccessAllowed(url, url);

#if BUILDFLAG(ENABLE_EXTENSIONS)
  GuestPermissionRequestHelper(url, render_frames, callback, allow);
#else
  FileSystemAccessed(url, render_frames, callback, allow);
#endif
}

#if BUILDFLAG(ENABLE_EXTENSIONS)
void ChromeContentBrowserClient::GuestPermissionRequestHelper(
    const GURL& url,
    const std::vector<content::GlobalFrameRoutingId>& render_frames,
    base::Callback<void(bool)> callback,
    bool allow) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  std::map<int, int> process_map;
  std::map<int, int>::const_iterator it;
  bool has_web_view_guest = false;
  // Record access to file system for potential display in UI.
  for (const auto& it : render_frames) {
    if (process_map.find(it.child_id) != process_map.end())
      continue;

    process_map.insert(std::pair<int, int>(it.child_id, it.frame_routing_id));

    if (extensions::WebViewRendererState::GetInstance()->IsGuest(it.child_id))
      has_web_view_guest = true;
  }
  if (!has_web_view_guest) {
    FileSystemAccessed(url, render_frames, callback, allow);
    return;
  }
  DCHECK_EQ(1U, process_map.size());
  it = process_map.begin();
  base::PostTaskWithTraits(
      FROM_HERE, {BrowserThread::UI},
      base::BindOnce(
          &ChromeContentBrowserClient::RequestFileSystemPermissionOnUIThread,
          it->first, it->second, url, allow,
          base::Bind(
              &ChromeContentBrowserClient::FileSystemAccessed,
              weak_factory_.GetWeakPtr(), url, render_frames,
              base::Bind(&InvokeCallbackOnThread,
                         base::SequencedTaskRunnerHandle::Get(), callback))));
}

void ChromeContentBrowserClient::RequestFileSystemPermissionOnUIThread(
    int render_process_id,
    int render_frame_id,
    const GURL& url,
    bool allowed_by_default,
    const base::Callback<void(bool)>& callback) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
  extensions::WebViewPermissionHelper* web_view_permission_helper =
      extensions::WebViewPermissionHelper::FromFrameID(
          render_process_id, render_frame_id);
  web_view_permission_helper->RequestFileSystemPermission(url,
                                                          allowed_by_default,
                                                          callback);
}
#endif

void ChromeContentBrowserClient::FileSystemAccessed(
    const GURL& url,
    const std::vector<content::GlobalFrameRoutingId>& render_frames,
    base::Callback<void(bool)> callback,
    bool allow) {
  // Record access to file system for potential display in UI.
  for (const auto& it : render_frames) {
    base::PostTaskWithTraits(
        FROM_HERE, {BrowserThread::UI},
        base::BindOnce(&TabSpecificContentSettings::FileSystemAccessed,
                       it.child_id, it.frame_routing_id, url, !allow));
  }
  callback.Run(allow);
}

bool ChromeContentBrowserClient::AllowWorkerIndexedDB(
    const GURL& url,
    content::ResourceContext* context,
    const std::vector<content::GlobalFrameRoutingId>& render_frames) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  ProfileIOData* io_data = ProfileIOData::FromResourceContext(context);
  content_settings::CookieSettings* cookie_settings =
      io_data->GetCookieSettings();
  bool allow = cookie_settings->IsCookieAccessAllowed(url, url);

  // Record access to IndexedDB for potential display in UI.
  for (const auto& it : render_frames) {
    base::PostTaskWithTraits(
        FROM_HERE, {BrowserThread::UI},
        base::BindOnce(&TabSpecificContentSettings::IndexedDBAccessed,
                       it.child_id, it.frame_routing_id, url, !allow));
  }

  return allow;
}

ChromeContentBrowserClient::AllowWebBluetoothResult
ChromeContentBrowserClient::AllowWebBluetooth(
    content::BrowserContext* browser_context,
    const url::Origin& requesting_origin,
    const url::Origin& embedding_origin) {
  // TODO(crbug.com/598890): Don't disable if
  // base::CommandLine::ForCurrentProcess()->
  // HasSwitch(switches::kEnableWebBluetooth) is true.
  if (variations::GetVariationParamValue(
          PermissionContextBase::kPermissionsKillSwitchFieldStudy,
          "Bluetooth") ==
      PermissionContextBase::kPermissionsKillSwitchBlockedValue) {
    // The kill switch is enabled for this permission. Block requests.
    return AllowWebBluetoothResult::BLOCK_GLOBALLY_DISABLED;
  }

  const HostContentSettingsMap* const content_settings =
      HostContentSettingsMapFactory::GetForProfile(
          Profile::FromBrowserContext(browser_context));

  if (content_settings->GetContentSetting(
          requesting_origin.GetURL(), embedding_origin.GetURL(),
          CONTENT_SETTINGS_TYPE_BLUETOOTH_GUARD,
          std::string()) == CONTENT_SETTING_BLOCK) {
    return AllowWebBluetoothResult::BLOCK_POLICY;
  }
  return AllowWebBluetoothResult::ALLOW;
}

std::string ChromeContentBrowserClient::GetWebBluetoothBlocklist() {
  return variations::GetVariationParamValue("WebBluetoothBlocklist",
                                            "blocklist_additions");
}

net::CookieStore* ChromeContentBrowserClient::OverrideCookieStoreForURL(
    const GURL& url,
    content::ResourceContext* context) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
#if BUILDFLAG(ENABLE_EXTENSIONS)
  if (url.SchemeIs(extensions::kExtensionScheme)) {
    ProfileIOData* io_data = ProfileIOData::FromResourceContext(context);
    return io_data->GetExtensionsCookieStore();
  }
#endif

  return nullptr;
}

#if defined(OS_CHROMEOS)
void ChromeContentBrowserClient::OnTrustAnchorUsed(
    const std::string& username_hash) {
  policy::PolicyCertServiceFactory::SetUsedPolicyCertificates(username_hash);
}
#endif

scoped_refptr<network::SharedURLLoaderFactory>
ChromeContentBrowserClient::GetSystemSharedURLLoaderFactory() {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI) ||
         !BrowserThread::IsThreadInitialized(BrowserThread::UI));

  if (!SystemNetworkContextManager::GetInstance())
    return nullptr;

  return SystemNetworkContextManager::GetInstance()
      ->GetSharedURLLoaderFactory();
}

network::mojom::NetworkContext*
ChromeContentBrowserClient::GetSystemNetworkContext() {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
  DCHECK(g_browser_process->system_network_context_manager());
  return g_browser_process->system_network_context_manager()->GetContext();
}

std::string ChromeContentBrowserClient::GetGeolocationApiKey() {
  return google_apis::GetAPIKey();
}

#if defined(OS_ANDROID)
bool ChromeContentBrowserClient::ShouldUseGmsCoreGeolocationProvider() {
  // Indicate that Chrome uses the GMS core location provider.
  return true;
}
#endif

QuotaPermissionContext*
ChromeContentBrowserClient::CreateQuotaPermissionContext() {
  return new ChromeQuotaPermissionContext();
}

void ChromeContentBrowserClient::GetQuotaSettings(
    content::BrowserContext* context,
    content::StoragePartition* partition,
    storage::OptionalQuotaSettingsCallback callback) {
  if (g_default_quota_settings) {
    // For debugging tests harness can inject settings.
    std::move(callback).Run(*g_default_quota_settings);
    return;
  }
  storage::GetNominalDynamicSettings(
      partition->GetPath(), context->IsOffTheRecord(), std::move(callback));
}

content::GeneratedCodeCacheSettings
ChromeContentBrowserClient::GetGeneratedCodeCacheSettings(
    content::BrowserContext* context) {
  base::FilePath cache_path;
  chrome::GetUserCacheDirectory(context->GetPath(), &cache_path);
  // If we pass 0 for size, disk_cache will pick a default size using the
  // heuristics based on available disk size. These are implemented in
  // disk_cache::PreferredCacheSize in net/disk_cache/cache_util.cc.
  return content::GeneratedCodeCacheSettings(true, 0, cache_path);
}

void ChromeContentBrowserClient::AllowCertificateError(
    content::WebContents* web_contents,
    int cert_error,
    const net::SSLInfo& ssl_info,
    const GURL& request_url,
    ResourceType resource_type,
    bool strict_enforcement,
    bool expired_previous_decision,
    const base::Callback<void(content::CertificateRequestResultType)>&
        callback) {
  DCHECK(web_contents);
  if (resource_type != content::RESOURCE_TYPE_MAIN_FRAME) {
    // A sub-resource has a certificate error. The user doesn't really
    // have a context for making the right decision, so block the
    // request hard, without an info bar to allow showing the insecure
    // content.
    if (!callback.is_null())
      callback.Run(content::CERTIFICATE_REQUEST_RESULT_TYPE_DENY);
    return;
  }

  // If the tab is being prerendered, cancel the prerender and the request.
  prerender::PrerenderContents* prerender_contents =
      prerender::PrerenderContents::FromWebContents(web_contents);
  if (prerender_contents) {
    prerender_contents->Destroy(prerender::FINAL_STATUS_SSL_ERROR);
    if (!callback.is_null()) {
      callback.Run(content::CERTIFICATE_REQUEST_RESULT_TYPE_CANCEL);
    }
    return;
  }

  if (base::FeatureList::IsEnabled(features::kSSLCommittedInterstitials)) {
    // We deny the request here in order to trigger the committed interstitials
    // code path (committing certificate error pages as navigations) instead of
    // the old code path.
    callback.Run(content::CERTIFICATE_REQUEST_RESULT_TYPE_DENY);
    return;
  }

  // Otherwise, display an SSL blocking page. The interstitial page takes
  // ownership of ssl_blocking_page. We pass a null BlockingPageReadyCallback()
  // to indicate that we don't want SSLErrorHandler to take the committed
  // interstitials code path.
  SSLErrorHandler::HandleSSLError(
      web_contents, cert_error, ssl_info, request_url,
      expired_previous_decision,
      std::make_unique<CertificateReportingServiceCertReporter>(web_contents),
      callback, SSLErrorHandler::BlockingPageReadyCallback());
}

namespace {

// Attempts to auto-select a client certificate according to the value of
// |CONTENT_SETTINGS_TYPE_AUTO_SELECT_CERTIFICATE| content setting for
// |requesting_url|. If no certificate was auto-selected, returns nullptr.
std::unique_ptr<net::ClientCertIdentity> AutoSelectCertificate(
    Profile* profile,
    const GURL& requesting_url,
    net::ClientCertIdentityList& client_certs) {
  HostContentSettingsMap* host_content_settings_map =
      HostContentSettingsMapFactory::GetForProfile(profile);
  std::unique_ptr<base::Value> setting =
      host_content_settings_map->GetWebsiteSetting(
          requesting_url, requesting_url,
          CONTENT_SETTINGS_TYPE_AUTO_SELECT_CERTIFICATE, std::string(), NULL);

  if (!setting)
    return nullptr;

  const base::DictionaryValue* setting_dict;
  if (!setting->GetAsDictionary(&setting_dict)) {
    NOTREACHED();
    return nullptr;
  }

  const base::Value* filters =
      setting_dict->FindKeyOfType("filters", base::Value::Type::LIST);
  if (filters) {
    for (const base::Value& filter : filters->GetList()) {
      const base::DictionaryValue* filter_dict;
      if (!filter.GetAsDictionary(&filter_dict)) {
        NOTREACHED();
        continue;
      }
      // Use the first certificate that is matched by the filter.
      for (size_t i = 0; i < client_certs.size(); ++i) {
        if (CertMatchesFilter(*client_certs[i]->certificate(), *filter_dict)) {
          return std::move(client_certs[i]);
        }
      }
    }
  } else {
    // |setting_dict| has the wrong format (e.g. single filter instead of a
    // list of filters). This content setting is only provided by
    // the |PolicyProvider|, which should always set it to a valid format.
    // Therefore, delete the invalid value.
    host_content_settings_map->SetWebsiteSettingDefaultScope(
        requesting_url, requesting_url,
        CONTENT_SETTINGS_TYPE_AUTO_SELECT_CERTIFICATE, std::string(), nullptr);
  }

  return nullptr;
}

void AddDataReductionProxyBinding(
    content::ResourceContext* resource_context,
    data_reduction_proxy::mojom::DataReductionProxyRequest request) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  auto* io_data = ProfileIOData::FromResourceContext(resource_context);
  if (io_data && io_data->data_reduction_proxy_io_data()) {
    io_data->data_reduction_proxy_io_data()->Clone(std::move(request));
  }
}

}  // namespace

void ChromeContentBrowserClient::SelectClientCertificate(
    content::WebContents* web_contents,
    net::SSLCertRequestInfo* cert_request_info,
    net::ClientCertIdentityList client_certs,
    std::unique_ptr<content::ClientCertificateDelegate> delegate) {
  prerender::PrerenderContents* prerender_contents =
      prerender::PrerenderContents::FromWebContents(web_contents);
  if (prerender_contents) {
    prerender_contents->Destroy(
        prerender::FINAL_STATUS_SSL_CLIENT_CERTIFICATE_REQUESTED);
    return;
  }

  GURL requesting_url("https://" + cert_request_info->host_and_port.ToString());
  DCHECK(requesting_url.is_valid())
      << "Invalid URL string: https://"
      << cert_request_info->host_and_port.ToString();

  bool may_show_cert_selection = true;

  Profile* profile =
      Profile::FromBrowserContext(web_contents->GetBrowserContext());
#if defined(OS_CHROMEOS)
  if (chromeos::ProfileHelper::IsSigninProfile(profile)) {
    // TODO(pmarko): crbug.com/723849: Set |may_show_cert_selection| to false
    // and remove the command-line flag after prototype phase when the
    // DeviceLoginScreenAutoSelectCertificateForUrls policy is live.
    may_show_cert_selection =
        chromeos::switches::IsSigninFrameClientCertUserSelectionEnabled();

    content::StoragePartition* storage_partition =
        content::BrowserContext::GetStoragePartition(
            profile, web_contents->GetSiteInstance());
    chromeos::login::SigninPartitionManager* signin_partition_manager =
        chromeos::login::SigninPartitionManager::Factory::GetForBrowserContext(
            profile);

    // On the sign-in profile, only allow client certs in the context of the
    // sign-in frame.
    if (!signin_partition_manager->IsCurrentSigninStoragePartition(
            storage_partition)) {
      LOG(WARNING)
          << "Client cert requested in sign-in profile in wrong context.";
      // Continue without client certificate. We do this to mimic the case of no
      // client certificate being present in the profile's certificate store.
      delegate->ContinueWithCertificate(nullptr, nullptr);
      return;
    }
    VLOG(1) << "Client cert requested in sign-in profile.";
  }
#endif  // defined(OS_CHROMEOS)

  std::unique_ptr<net::ClientCertIdentity> auto_selected_identity =
      AutoSelectCertificate(profile, requesting_url, client_certs);
  if (auto_selected_identity) {
    // The callback will own |auto_selected_identity| and |delegate|, keeping
    // them alive until after ContinueWithCertificate is called.
    scoped_refptr<net::X509Certificate> cert =
        auto_selected_identity->certificate();
    net::ClientCertIdentity::SelfOwningAcquirePrivateKey(
        std::move(auto_selected_identity),
        base::Bind(&content::ClientCertificateDelegate::ContinueWithCertificate,
                   base::Passed(&delegate), std::move(cert)));
    return;
  }

  if (!may_show_cert_selection) {
    LOG(WARNING) << "No client cert matched by policy and user selection is "
                    "not allowed.";
    // Continue without client certificate. We do this to mimic the case of no
    // client certificate being present in the profile's certificate store.
    delegate->ContinueWithCertificate(nullptr, nullptr);
    return;
  }

  chrome::ShowSSLClientCertificateSelector(web_contents, cert_request_info,
                                           std::move(client_certs),
                                           std::move(delegate));
}

content::MediaObserver* ChromeContentBrowserClient::GetMediaObserver() {
  return MediaCaptureDevicesDispatcher::GetInstance();
}

content::PlatformNotificationService*
ChromeContentBrowserClient::GetPlatformNotificationService() {
  return PlatformNotificationServiceImpl::GetInstance();
}

bool ChromeContentBrowserClient::CanCreateWindow(
    RenderFrameHost* opener,
    const GURL& opener_url,
    const GURL& opener_top_level_frame_url,
    const GURL& source_origin,
    content::mojom::WindowContainerType container_type,
    const GURL& target_url,
    const content::Referrer& referrer,
    const std::string& frame_name,
    WindowOpenDisposition disposition,
    const blink::mojom::WindowFeatures& features,
    bool user_gesture,
    bool opener_suppressed,
    bool* no_javascript_access) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
  DCHECK(opener);

  content::WebContents* web_contents =
      content::WebContents::FromRenderFrameHost(opener);
  Profile* profile =
      Profile::FromBrowserContext(web_contents->GetBrowserContext());
  DCHECK(profile);
  *no_javascript_access = false;

  // If the opener is trying to create a background window but doesn't have
  // the appropriate permission, fail the attempt.
  if (container_type == content::mojom::WindowContainerType::BACKGROUND) {
#if BUILDFLAG(ENABLE_EXTENSIONS)
    auto* process_map = extensions::ProcessMap::Get(profile);
    auto* registry = extensions::ExtensionRegistry::Get(profile);
    if (!URLHasExtensionBackgroundPermission(process_map, registry, opener_url,
                                             opener->GetProcess()->GetID())) {
      return false;
    }

    // Note: this use of GetExtensionOrAppByURL is safe but imperfect.  It may
    // return a recently installed Extension even if this CanCreateWindow call
    // was made by an old copy of the page in a normal web process.  That's ok,
    // because the permission check above would have caused an early return
    // already. We must use the full URL to find hosted apps, though, and not
    // just the origin.
    const Extension* extension =
        registry->enabled_extensions().GetExtensionOrAppByURL(opener_url);
    if (extension && !extensions::BackgroundInfo::AllowJSAccess(extension))
      *no_javascript_access = true;
#endif

    return true;
  }

#if BUILDFLAG(ENABLE_EXTENSIONS)
  if (extensions::WebViewRendererState::GetInstance()->IsGuest(
          opener->GetProcess()->GetID())) {
    return true;
  }

  if (target_url.SchemeIs(extensions::kExtensionScheme)) {
    // Intentionally duplicating |registry| code from above because we want to
    // reduce calls to retrieve them as this function is a SYNC IPC handler.
    auto* registry = extensions::ExtensionRegistry::Get(profile);
    const Extension* extension =
        registry->enabled_extensions().GetExtensionOrAppByURL(target_url);
    if (extension && extension->is_platform_app()) {
      UMA_HISTOGRAM_ENUMERATION(
          "Extensions.AppLoadedInTab",
          ClassifyAppLoadedInTabSource(opener_url, extension),
          APP_LOADED_IN_TAB_SOURCE_MAX);

      // window.open() may not be used to load v2 apps in a regular tab.
      return false;
    }
  }
#endif

#if BUILDFLAG(ENABLE_PLUGINS)
  HostContentSettingsMap* content_settings =
      HostContentSettingsMapFactory::GetForProfile(profile);
  if (FlashDownloadInterception::ShouldStopFlashDownloadAction(
          content_settings, opener_top_level_frame_url, target_url,
          user_gesture)) {
    FlashDownloadInterception::InterceptFlashDownloadNavigation(
        web_contents, opener_top_level_frame_url);
    return false;
  }
#endif

  // Don't let prerenders open popups.
  if (auto* prerender_contents =
          prerender::PrerenderContents::FromWebContents(web_contents)) {
    prerender_contents->Destroy(prerender::FINAL_STATUS_CREATE_NEW_WINDOW);
    return false;
  }

  BlockedWindowParams blocked_params(target_url, referrer, frame_name,
                                     disposition, features, user_gesture,
                                     opener_suppressed);
  NavigateParams nav_params = blocked_params.CreateNavigateParams(web_contents);
  if (MaybeBlockPopup(web_contents, opener_top_level_frame_url, &nav_params,
                      nullptr /*=open_url_params*/,
                      blocked_params.features())) {
    return false;
  }

#if defined(OS_ANDROID)
  auto* single_tab_mode_helper =
      SingleTabModeTabHelper::FromWebContents(web_contents);
  if (single_tab_mode_helper &&
      single_tab_mode_helper->block_all_new_windows()) {
    if (TabAndroid* tab_android = TabAndroid::FromWebContents(web_contents)) {
      tab_android->HandlePopupNavigation(&nav_params);
    }
    return false;
  }
#endif

  return true;
}

void ChromeContentBrowserClient::ResourceDispatcherHostCreated() {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);

  safe_browsing_service_ = g_browser_process->safe_browsing_service();

  for (size_t i = 0; i < extra_parts_.size(); ++i)
    extra_parts_[i]->ResourceDispatcherHostCreated();

  return g_browser_process->ResourceDispatcherHostCreated();
}

content::SpeechRecognitionManagerDelegate*
    ChromeContentBrowserClient::CreateSpeechRecognitionManagerDelegate() {
  return new speech::ChromeSpeechRecognitionManagerDelegate();
}

content::TtsControllerDelegate*
ChromeContentBrowserClient::GetTtsControllerDelegate() {
  TtsControllerDelegateImpl* delegate =
      TtsControllerDelegateImpl::GetInstance();
#if !defined(OS_ANDROID)
  TtsExtensionEngine* tts_extension_engine = TtsExtensionEngine::GetInstance();
  delegate->SetTtsEngineDelegate(tts_extension_engine);
#endif
  return delegate;
}

content::TtsPlatform* ChromeContentBrowserClient::GetTtsPlatform() {
#ifdef OS_CHROMEOS
  return TtsPlatformImplChromeOs::GetInstance();
#else
  return nullptr;
#endif
}

net::NetLog* ChromeContentBrowserClient::GetNetLog() {
  return g_browser_process->net_log();
}

void ChromeContentBrowserClient::OverrideWebkitPrefs(
    RenderViewHost* rvh, WebPreferences* web_prefs) {
  Profile* profile = Profile::FromBrowserContext(
      rvh->GetProcess()->GetBrowserContext());
  PrefService* prefs = profile->GetPrefs();

// Fill font preferences. These are not registered on Android
// - http://crbug.com/308033, http://crbug.com/696364.
#if !defined(OS_ANDROID)
  FontFamilyCache::FillFontFamilyMap(profile,
                                     prefs::kWebKitStandardFontFamilyMap,
                                     &web_prefs->standard_font_family_map);
  FontFamilyCache::FillFontFamilyMap(profile,
                                     prefs::kWebKitFixedFontFamilyMap,
                                     &web_prefs->fixed_font_family_map);
  FontFamilyCache::FillFontFamilyMap(profile,
                                     prefs::kWebKitSerifFontFamilyMap,
                                     &web_prefs->serif_font_family_map);
  FontFamilyCache::FillFontFamilyMap(profile,
                                     prefs::kWebKitSansSerifFontFamilyMap,
                                     &web_prefs->sans_serif_font_family_map);
  FontFamilyCache::FillFontFamilyMap(profile,
                                     prefs::kWebKitCursiveFontFamilyMap,
                                     &web_prefs->cursive_font_family_map);
  FontFamilyCache::FillFontFamilyMap(profile,
                                     prefs::kWebKitFantasyFontFamilyMap,
                                     &web_prefs->fantasy_font_family_map);
  FontFamilyCache::FillFontFamilyMap(profile,
                                     prefs::kWebKitPictographFontFamilyMap,
                                     &web_prefs->pictograph_font_family_map);

  web_prefs->default_font_size =
      prefs->GetInteger(prefs::kWebKitDefaultFontSize);
  web_prefs->default_fixed_font_size =
      prefs->GetInteger(prefs::kWebKitDefaultFixedFontSize);
  web_prefs->minimum_font_size =
      prefs->GetInteger(prefs::kWebKitMinimumFontSize);
  web_prefs->minimum_logical_font_size =
      prefs->GetInteger(prefs::kWebKitMinimumLogicalFontSize);
#endif

  web_prefs->default_encoding = prefs->GetString(prefs::kDefaultCharset);

  web_prefs->dom_paste_enabled =
      prefs->GetBoolean(prefs::kWebKitDomPasteEnabled);
  web_prefs->javascript_can_access_clipboard =
      prefs->GetBoolean(prefs::kWebKitJavascriptCanAccessClipboard);
  web_prefs->tabs_to_links = prefs->GetBoolean(prefs::kWebkitTabsToLinks);

  if (!prefs->GetBoolean(prefs::kWebKitJavascriptEnabled))
    web_prefs->javascript_enabled = false;

  // Only allow disabling web security via the command-line flag if the user
  // has specified a distinct profile directory. This still enables tests to
  // disable web security by setting the pref directly.
  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
  if (!prefs->GetBoolean(prefs::kWebKitWebSecurityEnabled)) {
    web_prefs->web_security_enabled = false;
  } else if (!web_prefs->web_security_enabled &&
             command_line->HasSwitch(switches::kDisableWebSecurity) &&
             !command_line->HasSwitch(switches::kUserDataDir)) {
    LOG(ERROR) << "Web security may only be disabled if '--user-data-dir' is "
               "also specified.";
    web_prefs->web_security_enabled = true;
  }

  if (!prefs->GetBoolean(prefs::kWebKitPluginsEnabled))
    web_prefs->plugins_enabled = false;
  web_prefs->loads_images_automatically =
      prefs->GetBoolean(prefs::kWebKitLoadsImagesAutomatically);

  if (prefs->GetBoolean(prefs::kDisable3DAPIs)) {
    web_prefs->webgl1_enabled = false;
    web_prefs->webgl2_enabled = false;
  }

  web_prefs->allow_running_insecure_content =
      prefs->GetBoolean(prefs::kWebKitAllowRunningInsecureContent);
#if defined(OS_ANDROID)
  web_prefs->font_scale_factor =
      static_cast<float>(prefs->GetDouble(prefs::kWebKitFontScaleFactor));
  web_prefs->device_scale_adjustment = GetDeviceScaleAdjustment();
  web_prefs->force_enable_zoom =
      prefs->GetBoolean(prefs::kWebKitForceEnableZoom);
#endif

#if defined(OS_ANDROID)
  web_prefs->password_echo_enabled =
      prefs->GetBoolean(prefs::kWebKitPasswordEchoEnabled);
#else
  web_prefs->password_echo_enabled = browser_defaults::kPasswordEchoEnabled;
#endif

  web_prefs->text_areas_are_resizable =
      prefs->GetBoolean(prefs::kWebKitTextAreasAreResizable);
  web_prefs->hyperlink_auditing_enabled =
      prefs->GetBoolean(prefs::kEnableHyperlinkAuditing);

#if BUILDFLAG(ENABLE_EXTENSIONS)
  std::string image_animation_policy =
      prefs->GetString(prefs::kAnimationPolicy);
  if (image_animation_policy == kAnimationPolicyOnce)
    web_prefs->animation_policy =
        content::IMAGE_ANIMATION_POLICY_ANIMATION_ONCE;
  else if (image_animation_policy == kAnimationPolicyNone)
    web_prefs->animation_policy = content::IMAGE_ANIMATION_POLICY_NO_ANIMATION;
  else
    web_prefs->animation_policy = content::IMAGE_ANIMATION_POLICY_ALLOWED;
#endif

  // Make sure we will set the default_encoding with canonical encoding name.
  web_prefs->default_encoding =
      base::GetCanonicalEncodingNameByAliasName(web_prefs->default_encoding);
  if (web_prefs->default_encoding.empty()) {
    prefs->ClearPref(prefs::kDefaultCharset);
    web_prefs->default_encoding = prefs->GetString(prefs::kDefaultCharset);
  }
  DCHECK(!web_prefs->default_encoding.empty());

  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kEnablePotentiallyAnnoyingSecurityFeatures)) {
    web_prefs->disable_reading_from_canvas = true;
    web_prefs->strict_mixed_content_checking = true;
    web_prefs->strict_powerful_feature_restrictions = true;
  }

  web_prefs->data_saver_enabled = GetDataSaverEnabledPref(prefs);

  web_prefs->data_saver_holdback_web_api_enabled =
      base::GetFieldTrialParamByFeatureAsBool(features::kDataSaverHoldback,
                                              "holdback_web", false);
  // Media holdback is enabled by default. Enabling this by default decouples
  // the behavior of the media stack (e.g., autoplay or preloading of
  // metadata) from the state of the data saver.
  web_prefs->data_saver_holdback_media_api_enabled =
      base::GetFieldTrialParamByFeatureAsBool(features::kDataSaverHoldback,
                                              "holdback_media", true);

  content::WebContents* contents =
      content::WebContents::FromRenderViewHost(rvh);
  if (contents) {
#if defined(OS_ANDROID)
    TabAndroid* tab_android = TabAndroid::FromWebContents(contents);
    if (tab_android) {
      web_prefs->embedded_media_experience_enabled =
          tab_android->ShouldEnableEmbeddedMediaExperience();

      if (base::FeatureList::IsEnabled(
              features::kAllowAutoplayUnmutedInWebappManifestScope)) {
        web_prefs->media_playback_gesture_whitelist_scope =
            tab_android->GetWebappManifestScope();
      }

      web_prefs->picture_in_picture_enabled =
          tab_android->IsPictureInPictureEnabled();
    }
#endif  // defined(OS_ANDROID)

#if BUILDFLAG(ENABLE_EXTENSIONS)
    Browser* browser = chrome::FindBrowserWithWebContents(contents);
    if (browser && browser->hosted_app_controller() &&
        browser->hosted_app_controller()->created_for_installed_pwa()) {
      web_prefs->strict_mixed_content_checking = true;
    }
#endif

    web_prefs->immersive_mode_enabled = vr::VrTabHelper::IsInVr(contents);
  }

#if defined(OS_ANDROID)
  web_prefs->video_fullscreen_detection_enabled = true;

  web_prefs->enable_media_download_in_product_help =
      base::FeatureList::IsEnabled(
          feature_engagement::kIPHMediaDownloadFeature);
#endif  // defined(OS_ANDROID)

  if (base::FeatureList::IsEnabled(features::kLowPriorityIframes)) {
    // Obtain the maximum effective connection type at which the feature is
    // enabled.
    std::string effective_connection_type_param =
        base::GetFieldTrialParamValueByFeature(
            features::kLowPriorityIframes,
            "max_effective_connection_type_threshold");

    base::Optional<net::EffectiveConnectionType> effective_connection_type =
        net::GetEffectiveConnectionTypeForName(effective_connection_type_param);
    if (effective_connection_type) {
      web_prefs->low_priority_iframes_threshold =
          effective_connection_type.value();
    }
  }

  web_prefs->lazy_load_enabled =
      (base::FeatureList::IsEnabled(features::kLazyFrameLoading) ||
       base::FeatureList::IsEnabled(features::kLazyImageLoading)) &&
      (!contents || !contents->GetDelegate() ||
       contents->GetDelegate()->ShouldAllowLazyLoad());

  if (base::FeatureList::IsEnabled(features::kLazyFrameLoading)) {
    const char* param_name =
        web_prefs->data_saver_enabled
            ? "lazy_frame_loading_distance_thresholds_px_by_ect"
            : "lazy_frame_loading_distance_thresholds_px_by_ect_with_data_"
              "saver_enabled";

    base::StringPairs pairs;
    base::SplitStringIntoKeyValuePairs(
        base::GetFieldTrialParamValueByFeature(features::kLazyFrameLoading,
                                               param_name),
        ':', ',', &pairs);

    for (const auto& pair : pairs) {
      base::Optional<net::EffectiveConnectionType> effective_connection_type =
          net::GetEffectiveConnectionTypeForName(pair.first);
      int value = 0;
      if (effective_connection_type && base::StringToInt(pair.second, &value)) {
        web_prefs->lazy_frame_loading_distance_thresholds_px
            [effective_connection_type.value()] = value;
      }
    }
  }

  if (base::FeatureList::IsEnabled(features::kLazyImageLoading)) {
    const char* param_name =
        web_prefs->data_saver_enabled
            ? "lazy_image_loading_distance_thresholds_px_by_ect"
            : "lazy_image_loading_distance_thresholds_px_by_ect_with_data_"
              "saver_enabled";

    base::StringPairs pairs;
    base::SplitStringIntoKeyValuePairs(
        base::GetFieldTrialParamValueByFeature(features::kLazyImageLoading,
                                               param_name),
        ':', ',', &pairs);

    for (const auto& pair : pairs) {
      base::Optional<net::EffectiveConnectionType> effective_connection_type =
          net::GetEffectiveConnectionTypeForName(pair.first);
      int value = 0;
      if (effective_connection_type && base::StringToInt(pair.second, &value)) {
        web_prefs->lazy_image_loading_distance_thresholds_px
            [effective_connection_type.value()] = value;
      }
    }
  }

  if (base::FeatureList::IsEnabled(
          features::kNetworkQualityEstimatorWebHoldback)) {
    std::string effective_connection_type_param =
        base::GetFieldTrialParamValueByFeature(
            features::kNetworkQualityEstimatorWebHoldback,
            "web_effective_connection_type_override");

    base::Optional<net::EffectiveConnectionType> effective_connection_type =
        net::GetEffectiveConnectionTypeForName(effective_connection_type_param);
    DCHECK(effective_connection_type_param.empty() ||
           effective_connection_type);
    if (effective_connection_type) {
      DCHECK_NE(net::EFFECTIVE_CONNECTION_TYPE_UNKNOWN,
                effective_connection_type.value());
      web_prefs->network_quality_estimator_web_holdback =
          effective_connection_type.value();
    }
  }

#if !defined(OS_ANDROID)
  if (IsAutoplayAllowedByPolicy(contents, prefs)) {
    // If autoplay is allowed by policy then force the no user gesture required
    // autoplay policy.
    web_prefs->autoplay_policy =
        content::AutoplayPolicy::kNoUserGestureRequired;
  } else if (base::FeatureList::IsEnabled(media::kAutoplayDisableSettings) &&
             web_prefs->autoplay_policy ==
                 content::AutoplayPolicy::kDocumentUserActivationRequired) {
    // If the autoplay disable settings feature is enabled and the autoplay
    // policy is set to using the unified policy then set the default autoplay
    // policy based on user preference.
    web_prefs->autoplay_policy =
        UnifiedAutoplayConfig::ShouldBlockAutoplay(profile)
            ? content::AutoplayPolicy::kDocumentUserActivationRequired
            : content::AutoplayPolicy::kNoUserGestureRequired;
  }
#endif  // !defined(OS_ANDROID)

  web_prefs->translate_service_available = TranslateService::IsAvailable(prefs);
  for (size_t i = 0; i < extra_parts_.size(); ++i)
    extra_parts_[i]->OverrideWebkitPrefs(rvh, web_prefs);
}

void ChromeContentBrowserClient::BrowserURLHandlerCreated(
    BrowserURLHandler* handler) {
  for (size_t i = 0; i < extra_parts_.size(); ++i)
    extra_parts_[i]->BrowserURLHandlerCreated(handler);

  // about: handler. Must come before chrome: handler, since it will
  // rewrite about: urls to chrome: URLs and then expect chrome: to
  // actually handle them.  Also relies on a preliminary fixup phase.
  handler->SetFixupHandler(&FixupBrowserAboutURL);
  handler->AddHandlerPair(&WillHandleBrowserAboutURL,
                          BrowserURLHandler::null_handler());

  // The group policy NTP URL handler must be registered before the other NTP
  // URL handlers below.
  handler->AddHandlerPair(&HandleNewTabPageLocationOverride,
                          BrowserURLHandler::null_handler());

#if defined(OS_ANDROID)
  // Handler to rewrite chrome://newtab on Android.
  handler->AddHandlerPair(&chrome::android::HandleAndroidNativePageURL,
                          BrowserURLHandler::null_handler());
#else
  // Handler to rewrite chrome://newtab for InstantExtended.
  handler->AddHandlerPair(&search::HandleNewTabURLRewrite,
                          &search::HandleNewTabURLReverseRewrite);
#endif

  // chrome: & friends.
  handler->AddHandlerPair(&ChromeContentBrowserClient::HandleWebUI,
                          &ChromeContentBrowserClient::HandleWebUIReverse);

  // Handler to rewrite Preview's Server Lite Page, to show the original URL to
  // the user.
  handler->AddHandlerPair(&HandlePreviewsLitePageURLRewrite,
                          &HandlePreviewsLitePageURLRewriteReverse);
}

base::FilePath ChromeContentBrowserClient::GetDefaultDownloadDirectory() {
  return DownloadPrefs::GetDefaultDownloadDirectory();
}

std::string ChromeContentBrowserClient::GetDefaultDownloadName() {
  return l10n_util::GetStringUTF8(IDS_DEFAULT_DOWNLOAD_FILENAME);
}

base::FilePath ChromeContentBrowserClient::GetShaderDiskCacheDirectory() {
  base::FilePath user_data_dir;
  base::PathService::Get(chrome::DIR_USER_DATA, &user_data_dir);
  DCHECK(!user_data_dir.empty());
  return user_data_dir.Append(FILE_PATH_LITERAL("ShaderCache"));
}

base::FilePath ChromeContentBrowserClient::GetGrShaderDiskCacheDirectory() {
  base::FilePath user_data_dir;
  base::PathService::Get(chrome::DIR_USER_DATA, &user_data_dir);
  DCHECK(!user_data_dir.empty());
  return user_data_dir.Append(FILE_PATH_LITERAL("GrShaderCache"));
}

void ChromeContentBrowserClient::DidCreatePpapiPlugin(
    content::BrowserPpapiHost* browser_host) {
#if BUILDFLAG(ENABLE_PLUGINS)
  ChromeContentBrowserClientPluginsPart::DidCreatePpapiPlugin(browser_host);
#endif
}

content::BrowserPpapiHost*
    ChromeContentBrowserClient::GetExternalBrowserPpapiHost(
        int plugin_process_id) {
#if BUILDFLAG(ENABLE_NACL)
  content::BrowserChildProcessHostIterator iter(PROCESS_TYPE_NACL_LOADER);
  while (!iter.Done()) {
    nacl::NaClProcessHost* host = static_cast<nacl::NaClProcessHost*>(
        iter.GetDelegate());
    if (host->process() &&
        host->process()->GetData().id == plugin_process_id) {
      // Found the plugin.
      return host->browser_ppapi_host();
    }
    ++iter;
  }
#endif
  return NULL;
}

bool ChromeContentBrowserClient::AllowPepperSocketAPI(
    content::BrowserContext* browser_context,
    const GURL& url,
    bool private_api,
    const content::SocketPermissionRequest* params) {
#if BUILDFLAG(ENABLE_PLUGINS) && BUILDFLAG(ENABLE_EXTENSIONS)
  return ChromeContentBrowserClientPluginsPart::AllowPepperSocketAPI(
      browser_context, url, private_api, params, allowed_socket_origins_);
#else
  return false;
#endif
}

bool ChromeContentBrowserClient::IsPepperVpnProviderAPIAllowed(
    content::BrowserContext* browser_context,
    const GURL& url) {
#if BUILDFLAG(ENABLE_PLUGINS) && BUILDFLAG(ENABLE_EXTENSIONS)
  return ChromeContentBrowserClientPluginsPart::IsPepperVpnProviderAPIAllowed(
      browser_context, url);
#else
  return false;
#endif
}

std::unique_ptr<content::VpnServiceProxy>
ChromeContentBrowserClient::GetVpnServiceProxy(
    content::BrowserContext* browser_context) {
#if BUILDFLAG(ENABLE_EXTENSIONS)
  return ChromeContentBrowserClientExtensionsPart::GetVpnServiceProxy(
      browser_context);
#else
  return nullptr;
#endif
}

std::unique_ptr<ui::SelectFilePolicy>
ChromeContentBrowserClient::CreateSelectFilePolicy(WebContents* web_contents) {
  return std::make_unique<ChromeSelectFilePolicy>(web_contents);
}

void ChromeContentBrowserClient::GetAdditionalAllowedSchemesForFileSystem(
    std::vector<std::string>* additional_allowed_schemes) {
  ContentBrowserClient::GetAdditionalAllowedSchemesForFileSystem(
      additional_allowed_schemes);
  additional_allowed_schemes->push_back(content::kChromeDevToolsScheme);
  additional_allowed_schemes->push_back(content::kChromeUIScheme);
  for (size_t i = 0; i < extra_parts_.size(); ++i) {
    extra_parts_[i]->GetAdditionalAllowedSchemesForFileSystem(
        additional_allowed_schemes);
  }
}

void ChromeContentBrowserClient::GetSchemesBypassingSecureContextCheckWhitelist(
    std::set<std::string>* schemes) {
  *schemes = secure_origin_whitelist::GetSchemesBypassingSecureContextCheck();
}

void ChromeContentBrowserClient::GetURLRequestAutoMountHandlers(
    std::vector<storage::URLRequestAutoMountHandler>* handlers) {
  for (size_t i = 0; i < extra_parts_.size(); ++i)
    extra_parts_[i]->GetURLRequestAutoMountHandlers(handlers);
}

::rappor::RapporService* ChromeContentBrowserClient::GetRapporService() {
  return g_browser_process->rappor_service();
}

void ChromeContentBrowserClient::GetAdditionalFileSystemBackends(
    content::BrowserContext* browser_context,
    const base::FilePath& storage_partition_path,
    std::vector<std::unique_ptr<storage::FileSystemBackend>>*
        additional_backends) {
#if defined(OS_CHROMEOS)
  storage::ExternalMountPoints* external_mount_points =
      content::BrowserContext::GetMountPoints(browser_context);
  DCHECK(external_mount_points);
  auto backend = std::make_unique<chromeos::FileSystemBackend>(
      std::make_unique<drive::FileSystemBackendDelegate>(),
      std::make_unique<chromeos::file_system_provider::BackendDelegate>(),
      std::make_unique<chromeos::MTPFileSystemBackendDelegate>(
          storage_partition_path),
      std::make_unique<arc::ArcContentFileSystemBackendDelegate>(),
      std::make_unique<arc::ArcDocumentsProviderBackendDelegate>(),
      std::make_unique<drive::DriveFsFileSystemBackendDelegate>(
          Profile::FromBrowserContext(browser_context)),
      external_mount_points, storage::ExternalMountPoints::GetSystemInstance());
  backend->AddSystemMountPoints();
  DCHECK(backend->CanHandleType(storage::kFileSystemTypeExternal));
  additional_backends->push_back(std::move(backend));
#endif

  for (size_t i = 0; i < extra_parts_.size(); ++i) {
    extra_parts_[i]->GetAdditionalFileSystemBackends(
        browser_context, storage_partition_path, additional_backends);
  }
}

#if defined(OS_POSIX) && !defined(OS_MACOSX)
void ChromeContentBrowserClient::GetAdditionalMappedFilesForChildProcess(
    const base::CommandLine& command_line,
    int child_process_id,
    PosixFileDescriptorInfo* mappings) {

#if defined(OS_ANDROID)
  base::MemoryMappedFile::Region region;
  int fd = ui::GetMainAndroidPackFd(&region);
  mappings->ShareWithRegion(kAndroidUIResourcesPakDescriptor, fd, region);

  fd = ui::GetCommonResourcesPackFd(&region);
  mappings->ShareWithRegion(kAndroidChrome100PercentPakDescriptor, fd, region);

  fd = ui::GetLocalePackFd(&region);
  mappings->ShareWithRegion(kAndroidLocalePakDescriptor, fd, region);

  // Optional secondary locale .pak file.
  fd = ui::GetSecondaryLocalePackFd(&region);
  if (fd != -1) {
    mappings->ShareWithRegion(kAndroidSecondaryLocalePakDescriptor, fd, region);
  }

  base::FilePath app_data_path;
  base::PathService::Get(base::DIR_ANDROID_APP_DATA, &app_data_path);
  DCHECK(!app_data_path.empty());
#endif  // defined(OS_ANDROID)
  int crash_signal_fd = GetCrashSignalFD(command_line);
  if (crash_signal_fd >= 0) {
    mappings->Share(service_manager::kCrashDumpSignal, crash_signal_fd);
  }
}
#endif  // defined(OS_POSIX) && !defined(OS_MACOSX)

#if defined(OS_WIN)
base::string16 ChromeContentBrowserClient::GetAppContainerSidForSandboxType(
    int sandbox_type) const {
  // TODO(wfh): Add support for more process types here. crbug.com/499523
  switch (sandbox_type) {
    case service_manager::SANDBOX_TYPE_RENDERER:
      return base::string16(install_static::GetSandboxSidPrefix()) +
             L"129201922";
    case service_manager::SANDBOX_TYPE_UTILITY:
      return base::string16();
    case service_manager::SANDBOX_TYPE_GPU:
      return base::string16();
    case service_manager::SANDBOX_TYPE_PPAPI:
      return base::string16(install_static::GetSandboxSidPrefix()) +
             L"129201925";
#if BUILDFLAG(ENABLE_NACL)
    case PROCESS_TYPE_NACL_LOADER:
      return base::string16();
    case PROCESS_TYPE_NACL_BROKER:
      return base::string16();
#endif
  }

  // Should never reach here.
  CHECK(0);
  return base::string16();
}

bool ChromeContentBrowserClient::PreSpawnRenderer(
    sandbox::TargetPolicy* policy) {
  // This code is duplicated in nacl_exe_win_64.cc.
  // Allow the server side of a pipe restricted to the "chrome.nacl."
  // namespace so that it cannot impersonate other system or other chrome
  // service pipes.
  sandbox::ResultCode result = policy->AddRule(
      sandbox::TargetPolicy::SUBSYS_NAMED_PIPES,
      sandbox::TargetPolicy::NAMEDPIPES_ALLOW_ANY,
      L"\\\\.\\pipe\\chrome.nacl.*");
  if (result != sandbox::SBOX_ALL_OK)
    return false;
  return result == sandbox::SBOX_ALL_OK;
}
#endif  // defined(OS_WIN)

void ChromeContentBrowserClient::ExposeInterfacesToRenderer(
    service_manager::BinderRegistry* registry,
    blink::AssociatedInterfaceRegistry* associated_registry,
    content::RenderProcessHost* render_process_host) {
  // The CacheStatsRecorder is an associated binding, instead of a
  // non-associated one, because the sender (in the renderer process) posts the
  // message after a time delay, in order to rate limit. The association
  // protects against the render process host ID being recycled in that time
  // gap between the preparation and the execution of that IPC.
  associated_registry->AddInterface(
      base::Bind(&CacheStatsRecorder::Create, render_process_host->GetID()));

  scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner =
      base::CreateSingleThreadTaskRunnerWithTraits(
          {content::BrowserThread::UI});
  registry->AddInterface(
      base::Bind(&rappor::RapporRecorderImpl::Create,
                 g_browser_process->rappor_service()),
      ui_task_runner);
  registry->AddInterface(
      base::BindRepeating(&metrics::CallStackProfileCollector::Create));

  if (NetBenchmarking::CheckBenchmarkingEnabled()) {
    Profile* profile =
        Profile::FromBrowserContext(render_process_host->GetBrowserContext());
    auto* loading_predictor =
        predictors::LoadingPredictorFactory::GetForProfile(profile);
    registry->AddInterface(
        base::BindRepeating(
            &NetBenchmarking::Create,
            loading_predictor ? loading_predictor->GetWeakPtr() : nullptr,
            render_process_host->GetID()),
        ui_task_runner);
  }

#if defined(SAFE_BROWSING_DB_LOCAL) || defined(SAFE_BROWSING_DB_REMOTE)
  if (safe_browsing_service_) {
    content::ResourceContext* resource_context =
        render_process_host->GetBrowserContext()->GetResourceContext();
    registry->AddInterface(
        base::Bind(
            &safe_browsing::MojoSafeBrowsingImpl::MaybeCreate,
            render_process_host->GetID(), resource_context,
            base::Bind(
                &ChromeContentBrowserClient::GetSafeBrowsingUrlCheckerDelegate,
                base::Unretained(this), resource_context)),
        base::CreateSingleThreadTaskRunnerWithTraits({BrowserThread::IO}));
  }
#endif  // defined(SAFE_BROWSING_DB_LOCAL) || defined(SAFE_BROWSING_DB_REMOTE)

  if (data_reduction_proxy::params::IsEnabledWithNetworkService()) {
    registry->AddInterface(base::BindRepeating(
        &AddDataReductionProxyBinding,
        render_process_host->GetBrowserContext()->GetResourceContext()));
  }

#if defined(OS_WIN)
  // Add the ModuleEventSink interface. This is the interface used by renderer
  // processes to notify the browser of modules in their address space. The
  // process handle is not yet available at this point so pass in a callback
  // to allow to retrieve a duplicate at the time the interface is actually
  // created. It is safe to pass a raw pointer to |render_process_host|: the
  // callback will be invoked in the context of ModuleDatabase::GetInstance,
  // which is invoked by Mojo initialization, which occurs while the
  // |render_process_host| is alive.
  auto get_process = base::BindRepeating(
      [](content::RenderProcessHost* host) -> base::Process {
        return host->GetProcess().Duplicate();
      },
      base::Unretained(render_process_host));
  // The ModuleDatabase is a global singleton so passing an unretained pointer
  // is safe.
  registry->AddInterface(
      base::BindRepeating(&ModuleEventSinkImpl::Create, std::move(get_process),
                          content::PROCESS_TYPE_RENDERER,
                          base::Unretained(ModuleDatabase::GetInstance())),
      ui_task_runner);
#endif
#if defined(OS_ANDROID)
  Profile* profile =
      Profile::FromBrowserContext(render_process_host->GetBrowserContext());
  registry->AddInterface(
      base::BindRepeating(&android::AvailableOfflineContentProvider::Create,
                          profile),
      base::CreateSingleThreadTaskRunnerWithTraits({BrowserThread::UI}));
#endif

  for (auto* ep : extra_parts_) {
    ep->ExposeInterfacesToRenderer(registry, associated_registry,
                                   render_process_host);
  }
}

void ChromeContentBrowserClient::ExposeInterfacesToMediaService(
    service_manager::BinderRegistry* registry,
    content::RenderFrameHost* render_frame_host) {
#if BUILDFLAG(ENABLE_LIBRARY_CDMS)
  registry->AddInterface(
      base::Bind(&OutputProtectionImpl::Create, render_frame_host));
  registry->AddInterface(
      base::Bind(&PlatformVerificationImpl::Create, render_frame_host));
#endif  // BUILDFLAG(ENABLE_LIBRARY_CDMS)

#if BUILDFLAG(ENABLE_MOJO_CDM) && defined(OS_ANDROID)
  registry->AddInterface(base::Bind(&CreateMediaDrmStorage, render_frame_host));
#endif
}

void ChromeContentBrowserClient::BindInterfaceRequestFromFrame(
    content::RenderFrameHost* render_frame_host,
    const std::string& interface_name,
    mojo::ScopedMessagePipeHandle interface_pipe) {
  if (!frame_interfaces_ && !frame_interfaces_parameterized_ &&
      !worker_interfaces_parameterized_) {
    InitWebContextInterfaces();
  }

  if (!frame_interfaces_parameterized_->TryBindInterface(
          interface_name, &interface_pipe, render_frame_host)) {
    frame_interfaces_->TryBindInterface(interface_name, &interface_pipe);
  }
}

bool ChromeContentBrowserClient::BindAssociatedInterfaceRequestFromFrame(
    content::RenderFrameHost* render_frame_host,
    const std::string& interface_name,
    mojo::ScopedInterfaceEndpointHandle* handle) {
  if (interface_name == autofill::mojom::AutofillDriver::Name_) {
    autofill::ContentAutofillDriverFactory::BindAutofillDriver(
        autofill::mojom::AutofillDriverAssociatedRequest(std::move(*handle)),
        render_frame_host);
    return true;
  }

  return false;
}

void ChromeContentBrowserClient::BindInterfaceRequestFromWorker(
    content::RenderProcessHost* render_process_host,
    const url::Origin& origin,
    const std::string& interface_name,
    mojo::ScopedMessagePipeHandle interface_pipe) {
  if (!frame_interfaces_ && !frame_interfaces_parameterized_ &&
      !worker_interfaces_parameterized_) {
    InitWebContextInterfaces();
  }

  worker_interfaces_parameterized_->BindInterface(
      interface_name, std::move(interface_pipe), render_process_host, origin);
}

void ChromeContentBrowserClient::BindInterfaceRequest(
    const service_manager::BindSourceInfo& source_info,
    const std::string& interface_name,
    mojo::ScopedMessagePipeHandle* interface_pipe) {
  if (source_info.identity.name() == content::mojom::kGpuServiceName)
    gpu_binder_registry_.TryBindInterface(interface_name, interface_pipe);
}

void ChromeContentBrowserClient::RegisterIOThreadServiceHandlers(
    content::ServiceManagerConnection* connection) {
  connection->AddServiceRequestHandler(
      chrome::mojom::kServiceName,
      ChromeService::GetInstance()->CreateChromeServiceRequestHandler());

#if defined(OS_ANDROID)
  connection->AddServiceRequestHandler(
      proxy_resolver::mojom::kProxyResolverServiceName,
      base::BindRepeating([](service_manager::mojom::ServiceRequest request) {
        service_manager::Service::RunAsyncUntilTermination(
            std::make_unique<proxy_resolver::ProxyResolverService>(
                std::move(request)));
      }));
  connection->AddServiceRequestHandler(
      "download_manager", base::BindRepeating(&StartDownloadManager));
#endif
}

void ChromeContentBrowserClient::RegisterOutOfProcessServices(
    OutOfProcessServiceMap* services) {
#if BUILDFLAG(ENABLE_ISOLATED_XR_SERVICE)
  (*services)[device::mojom::kVrIsolatedServiceName] = base::BindRepeating(
      &l10n_util::GetStringUTF16, IDS_ISOLATED_XR_PROCESS_NAME);
#endif

#if BUILDFLAG(ENABLE_PRINTING)
  (*services)[printing::mojom::kServiceName] =
      base::BindRepeating(&l10n_util::GetStringUTF16,
                          IDS_UTILITY_PROCESS_PDF_COMPOSITOR_SERVICE_NAME);
#endif

#if BUILDFLAG(ENABLE_PRINT_PREVIEW) || \
    (BUILDFLAG(ENABLE_PRINTING) && defined(OS_WIN))
  (*services)[printing::mojom::kChromePrintingServiceName] =
      base::BindRepeating(&l10n_util::GetStringUTF16,
                          IDS_UTILITY_PROCESS_PRINTING_SERVICE_NAME);
#endif

  (*services)[heap_profiling::mojom::kServiceName] = base::BindRepeating(
      &l10n_util::GetStringUTF16, IDS_UTILITY_PROCESS_PROFILING_SERVICE_NAME);

#if BUILDFLAG(ENABLE_EXTENSIONS) || defined(OS_ANDROID)
  (*services)[chrome::mojom::kMediaGalleryUtilServiceName] =
      base::BindRepeating(&l10n_util::GetStringUTF16,
                          IDS_UTILITY_PROCESS_MEDIA_GALLERY_UTILITY_NAME);
#endif

#if BUILDFLAG(ENABLE_EXTENSIONS)
  (*services)[chrome::mojom::kRemovableStorageWriterServiceName] =
      base::BindRepeating(&l10n_util::GetStringUTF16,
                          IDS_UTILITY_PROCESS_IMAGE_WRITER_NAME);
#endif

#if defined(OS_WIN)
  (*services)[chrome::mojom::kUtilWinServiceName] = base::BindRepeating(
      &l10n_util::GetStringUTF16, IDS_UTILITY_PROCESS_UTILITY_WIN_NAME);
#endif

#if defined(OS_WIN) && BUILDFLAG(ENABLE_EXTENSIONS)
  (*services)[chrome::mojom::kWifiUtilWinServiceName] =
      base::BindRepeating(&l10n_util::GetStringUTF16,
                          IDS_UTILITY_PROCESS_WIFI_CREDENTIALS_GETTER_NAME);
#endif

#if !defined(OS_ANDROID)
  (*services)[chrome::mojom::kProfileImportServiceName] = base::BindRepeating(
      &l10n_util::GetStringUTF16, IDS_UTILITY_PROCESS_PROFILE_IMPORTER_NAME);

  (*services)[proxy_resolver::mojom::kProxyResolverServiceName] =
      base::BindRepeating(&l10n_util::GetStringUTF16,
                          IDS_UTILITY_PROCESS_PROXY_RESOLVER_NAME);
#endif

#if BUILDFLAG(ENABLE_PRINTING) && defined(OS_CHROMEOS)
  (*services)[chrome::mojom::kCupsIppParserServiceName] =
      base::BindRepeating(&l10n_util::GetStringUTF16,
                          IDS_UTILITY_PROCESS_CUPS_IPP_PARSER_SERVICE_NAME);
#endif

#if defined(FULL_SAFE_BROWSING) || defined(OS_CHROMEOS)
  (*services)[chrome::mojom::kFileUtilServiceName] = base::BindRepeating(
      &l10n_util::GetStringUTF16, IDS_UTILITY_PROCESS_FILE_UTILITY_NAME);
#endif

#if !defined(OS_ANDROID)
  (*services)[patch::mojom::kServiceName] = base::BindRepeating(
      &l10n_util::GetStringUTF16, IDS_UTILITY_PROCESS_PATCH_NAME);
#endif

  (*services)[unzip::mojom::kServiceName] = base::BindRepeating(
      &l10n_util::GetStringUTF16, IDS_UTILITY_PROCESS_UNZIP_NAME);

#if defined(OS_CHROMEOS)
  ash_service_registry::RegisterOutOfProcessServices(services);

  (*services)[chromeos::ime::mojom::kServiceName] = base::BindRepeating(
      &l10n_util::GetStringUTF16, IDS_UTILITY_PROCESS_IME_SERVICE_NAME);
#endif

#if BUILDFLAG(ENABLE_SIMPLE_BROWSER_SERVICE_OUT_OF_PROCESS)
  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kLaunchSimpleBrowserSwitch)) {
    (*services)[simple_browser::mojom::kServiceName] =
        base::BindRepeating([]() -> base::string16 {
          return base::ASCIIToUTF16("Simple Browser");
        });
  }
#endif

#if !defined(OS_ANDROID)
  if (base::FeatureList::IsEnabled(mirroring::features::kMirroringService) &&
      base::FeatureList::IsEnabled(features::kAudioServiceAudioStreams) &&
      base::FeatureList::IsEnabled(network::features::kNetworkService)) {
    (*services)[mirroring::mojom::kServiceName] =
        base::BindRepeating(&base::ASCIIToUTF16, "Mirroring Service");
  }
#endif
}

void ChromeContentBrowserClient::HandleServiceRequest(
    const std::string& service_name,
    service_manager::mojom::ServiceRequest request) {
  if (service_name == prefs::mojom::kLocalStateServiceName) {
    if (!g_browser_process || !g_browser_process->pref_service_factory())
      return;

    service_manager::Service::RunAsyncUntilTermination(
        g_browser_process->pref_service_factory()->CreatePrefService(
            std::move(request)));
  }

#if BUILDFLAG(ENABLE_MOJO_MEDIA_IN_BROWSER_PROCESS)
  if (service_name == media::mojom::kMediaServiceName) {
    service_manager::Service::RunAsyncUntilTermination(
        media::CreateMediaService(std::move(request)));
  }
#endif

#if BUILDFLAG(ENABLE_SIMPLE_BROWSER_SERVICE_IN_PROCESS)
  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kLaunchInProcessSimpleBrowserSwitch) &&
      service_name == simple_browser::mojom::kServiceName) {
    service_manager::Service::RunAsyncUntilTermination(
        std::make_unique<simple_browser::SimpleBrowserService>(
            std::move(request), simple_browser::SimpleBrowserService::
                                    UIInitializationMode::kUseEnvironmentUI));
  }
#endif

#if defined(OS_CHROMEOS)
  if (base::FeatureList::IsEnabled(chromeos::features::kMultiDeviceApi) &&
      service_name == chromeos::secure_channel::mojom::kServiceName) {
    service_manager::Service::RunAsyncUntilTermination(
        std::make_unique<chromeos::secure_channel::SecureChannelService>(
            std::move(request)));
  }

  auto service = ash_service_registry::HandleServiceRequest(service_name,
                                                            std::move(request));
  if (service)
    service_manager::Service::RunAsyncUntilTermination(std::move(service));
#endif
}

bool ChromeContentBrowserClient::ShouldTerminateOnServiceQuit(
    const service_manager::Identity& id) {
#if defined(OS_CHROMEOS)
  return ash_service_registry::ShouldTerminateOnServiceQuit(id.name());
#endif
  return false;
}

std::unique_ptr<base::Value>
ChromeContentBrowserClient::GetServiceManifestOverlay(base::StringPiece name) {
  ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
  int id = -1;
  if (name == content::mojom::kBrowserServiceName)
    id = IDR_CHROME_CONTENT_BROWSER_MANIFEST_OVERLAY;
  else if (name == content::mojom::kGpuServiceName)
    id = IDR_CHROME_CONTENT_GPU_MANIFEST_OVERLAY;
  else if (name == content::mojom::kPackagedServicesServiceName)
    id = IDR_CHROME_CONTENT_PACKAGED_SERVICES_MANIFEST_OVERLAY;
  else if (name == content::mojom::kPluginServiceName)
    id = IDR_CHROME_CONTENT_PLUGIN_MANIFEST_OVERLAY;
  else if (name == content::mojom::kRendererServiceName)
    id = IDR_CHROME_CONTENT_RENDERER_MANIFEST_OVERLAY;
  else if (name == content::mojom::kUtilityServiceName)
    id = IDR_CHROME_CONTENT_UTILITY_MANIFEST_OVERLAY;
  if (id == -1)
    return nullptr;

  base::StringPiece manifest_contents =
      rb.GetRawDataResourceForScale(id, ui::ScaleFactor::SCALE_FACTOR_NONE);
  return base::JSONReader::Read(manifest_contents);
}

std::vector<content::ContentBrowserClient::ServiceManifestInfo>
ChromeContentBrowserClient::GetExtraServiceManifests() {
  return std::vector<content::ContentBrowserClient::ServiceManifestInfo>({
#if BUILDFLAG(ENABLE_NACL)
    {nacl::kNaClLoaderServiceName, IDR_NACL_LOADER_MANIFEST},
#if defined(OS_WIN)
        {nacl::kNaClBrokerServiceName, IDR_NACL_BROKER_MANIFEST},
#endif  // defined(OS_WIN)
#endif  // BUILDFLAG(ENABLE_NACL)
#if BUILDFLAG(ENABLE_PRINTING)
        {printing::mojom::kServiceName, IDR_PDF_COMPOSITOR_MANIFEST},
#endif
        {chrome::mojom::kRendererServiceName,
         IDR_CHROME_RENDERER_SERVICE_MANIFEST},
  });
}

std::vector<std::string> ChromeContentBrowserClient::GetStartupServices() {
#if defined(OS_ANDROID)
  return {"download_manager"};
#else
  return {};
#endif
}

void ChromeContentBrowserClient::OpenURL(
    content::SiteInstance* site_instance,
    const content::OpenURLParams& params,
    const base::RepeatingCallback<void(content::WebContents*)>& callback) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
  DCHECK(ShouldAllowOpenURL(site_instance, params.url));

  content::BrowserContext* browser_context = site_instance->GetBrowserContext();

#if defined(OS_ANDROID)
  ServiceTabLauncher::GetInstance()->LaunchTab(browser_context, params,
                                               callback);
#else
  NavigateParams nav_params(Profile::FromBrowserContext(browser_context),
                            params.url, params.transition);
  nav_params.FillNavigateParamsFromOpenURLParams(params);
  nav_params.user_gesture = params.user_gesture;

  Navigate(&nav_params);
  callback.Run(nav_params.navigated_or_inserted_contents);
#endif
}

content::ControllerPresentationServiceDelegate*
ChromeContentBrowserClient::GetControllerPresentationServiceDelegate(
    content::WebContents* web_contents) {
  if (media_router::MediaRouterEnabled(web_contents->GetBrowserContext())) {
    return media_router::PresentationServiceDelegateImpl::
        GetOrCreateForWebContents(web_contents);
  }
  return nullptr;
}

content::ReceiverPresentationServiceDelegate*
ChromeContentBrowserClient::GetReceiverPresentationServiceDelegate(
    content::WebContents* web_contents) {
  if (media_router::MediaRouterEnabled(web_contents->GetBrowserContext())) {
    // ReceiverPresentationServiceDelegateImpl exists only for WebContents
    // created for offscreen presentations. The WebContents must belong to
    // an incognito profile.
    if (auto* impl = media_router::ReceiverPresentationServiceDelegateImpl::
            FromWebContents(web_contents)) {
      DCHECK(web_contents->GetBrowserContext()->IsOffTheRecord());
      return impl;
    }
  }
  return nullptr;
}

void ChromeContentBrowserClient::RecordURLMetric(const std::string& metric,
                                                 const GURL& url) {
  if (url.is_valid()) {
    rappor::SampleDomainAndRegistryFromGURL(g_browser_process->rappor_service(),
                                            metric, url);
  }
}

std::string ChromeContentBrowserClient::GetMetricSuffixForURL(const GURL& url) {
  // Don't change these returned strings. They are written (in hashed form) into
  // UMA logs. If you add more strings, you must update histograms.xml and get
  // histograms review. Only Google domains should be here for privacy purposes.
  // TODO(falken): Ideally Chrome would log the relevant UMA directly and this
  // function could be removed.
  if (page_load_metrics::IsGoogleSearchResultUrl(url))
    return "search";
  if (url.host() == "docs.google.com")
    return "docs";
  return std::string();
}

std::vector<std::unique_ptr<content::NavigationThrottle>>
ChromeContentBrowserClient::CreateThrottlesForNavigation(
    content::NavigationHandle* handle) {
  std::vector<std::unique_ptr<content::NavigationThrottle>> throttles;

  // MetricsNavigationThrottle requires that it runs before NavigationThrottles
  // that may delay or cancel navigations, so only NavigationThrottles that
  // don't delay or cancel navigations (e.g. throttles that are only observing
  // callbacks without affecting navigation behavior) should be added before
  // MetricsNavigationThrottle.
  if (handle->IsInMainFrame()) {
    throttles.push_back(
        page_load_metrics::MetricsNavigationThrottle::Create(handle));
  }

#if BUILDFLAG(ENABLE_PLUGINS)
  std::unique_ptr<content::NavigationThrottle> flash_url_throttle =
      FlashDownloadInterception::MaybeCreateThrottleFor(handle);
  if (flash_url_throttle)
    throttles.push_back(std::move(flash_url_throttle));
#endif

#if BUILDFLAG(ENABLE_SUPERVISED_USERS)
  std::unique_ptr<content::NavigationThrottle> supervised_user_throttle =
      SupervisedUserNavigationThrottle::MaybeCreateThrottleFor(handle);
  if (supervised_user_throttle)
    throttles.push_back(std::move(supervised_user_throttle));
#endif

#if defined(OS_ANDROID)
  // TODO(davidben): This is insufficient to integrate with prerender properly.
  // https://crbug.com/370595
  prerender::PrerenderContents* prerender_contents =
      prerender::PrerenderContents::FromWebContents(handle->GetWebContents());
  if (!prerender_contents && handle->IsInMainFrame()) {
    throttles.push_back(
        navigation_interception::InterceptNavigationDelegate::CreateThrottleFor(
            handle));
  }
  throttles.push_back(InterceptOMADownloadNavigationThrottle::Create(handle));
#elif BUILDFLAG(ENABLE_EXTENSIONS)
  if (handle->IsInMainFrame()) {
    // Redirect some navigations to apps that have registered matching URL
    // handlers ('url_handlers' in the manifest).
    auto url_to_app_throttle =
        PlatformAppNavigationRedirector::MaybeCreateThrottleFor(handle);
    if (url_to_app_throttle)
      throttles.push_back(std::move(url_to_app_throttle));
  }

  if (base::FeatureList::IsEnabled(features::kDesktopPWAWindowing)) {
    if (base::FeatureList::IsEnabled(features::kDesktopPWAsLinkCapturing)) {
      auto bookmark_app_experimental_throttle =
          extensions::BookmarkAppExperimentalNavigationThrottle::
              MaybeCreateThrottleFor(handle);
      if (bookmark_app_experimental_throttle)
        throttles.push_back(std::move(bookmark_app_experimental_throttle));
    } else if (!base::FeatureList::IsEnabled(
                   features::kDesktopPWAsStayInWindow)) {
      // Only add the bookmark app navigation throttle if the stay in
      // window flag is not set, as the navigation throttle controls
      // opening out of scope links in the browser.
      auto bookmark_app_throttle =
          extensions::BookmarkAppNavigationThrottle::MaybeCreateThrottleFor(
              handle);
      if (bookmark_app_throttle)
        throttles.push_back(std::move(bookmark_app_throttle));
    }
  }
  if (base::FeatureList::IsEnabled(
          features::kMimeHandlerViewInCrossProcessFrame)) {
    auto plugin_frame_attach_throttle =
        extensions::ExtensionsGuestViewMessageFilter::MaybeCreateThrottle(
            handle);
    if (plugin_frame_attach_throttle)
      throttles.push_back(std::move(plugin_frame_attach_throttle));
  }
#endif

#if defined(OS_CHROMEOS)
  // Check if we need to add merge session throttle. This throttle will postpone
  // loading of main frames.
  if (handle->IsInMainFrame()) {
    // Add interstitial page while merge session process (cookie reconstruction
    // from OAuth2 refresh token in ChromeOS login) is still in progress while
    // we are attempting to load a google property.
    if (merge_session_throttling_utils::ShouldAttachNavigationThrottle() &&
        !merge_session_throttling_utils::AreAllSessionMergedAlready() &&
        handle->GetURL().SchemeIsHTTPOrHTTPS()) {
      throttles.push_back(MergeSessionNavigationThrottle::Create(handle));
    }

    auto url_to_apps_throttle =
        chromeos::AppsNavigationThrottle::MaybeCreate(handle);
    if (url_to_apps_throttle)
      throttles.push_back(std::move(url_to_apps_throttle));
  }
#endif

#if BUILDFLAG(ENABLE_EXTENSIONS)
  throttles.push_back(
      std::make_unique<extensions::ExtensionNavigationThrottle>(handle));

  std::unique_ptr<content::NavigationThrottle> user_script_throttle =
      extensions::ExtensionsBrowserClient::Get()
          ->GetUserScriptListener()
          ->CreateNavigationThrottle(handle);
  if (user_script_throttle)
    throttles.push_back(std::move(user_script_throttle));
#endif

#if BUILDFLAG(ENABLE_SUPERVISED_USERS)
  std::unique_ptr<content::NavigationThrottle> supervised_user_nav_throttle =
      SupervisedUserGoogleAuthNavigationThrottle::MaybeCreate(handle);
  if (supervised_user_nav_throttle)
    throttles.push_back(std::move(supervised_user_nav_throttle));
#endif

  content::WebContents* web_contents = handle->GetWebContents();
  if (auto* subresource_filter_client =
          ChromeSubresourceFilterClient::FromWebContents(web_contents)) {
    subresource_filter_client->MaybeAppendNavigationThrottles(handle,
                                                              &throttles);
  }

#if !defined(OS_ANDROID)
  // BackgroundTabNavigationThrottle is used by TabManager, which is only
  // enabled on non-Android platforms.
  std::unique_ptr<content::NavigationThrottle>
      background_tab_navigation_throttle = resource_coordinator::
          BackgroundTabNavigationThrottle::MaybeCreateThrottleFor(handle);
  if (background_tab_navigation_throttle)
    throttles.push_back(std::move(background_tab_navigation_throttle));
#endif

#if defined(SAFE_BROWSING_DB_LOCAL)
  std::unique_ptr<content::NavigationThrottle>
      password_protection_navigation_throttle =
          safe_browsing::MaybeCreateNavigationThrottle(handle);
  if (password_protection_navigation_throttle) {
    throttles.push_back(std::move(password_protection_navigation_throttle));
  }
#endif

  std::unique_ptr<content::NavigationThrottle> pdf_iframe_throttle =
      PDFIFrameNavigationThrottle::MaybeCreateThrottleFor(handle);
  if (pdf_iframe_throttle)
    throttles.push_back(std::move(pdf_iframe_throttle));

  std::unique_ptr<content::NavigationThrottle> tab_under_throttle =
      TabUnderNavigationThrottle::MaybeCreate(handle);
  if (tab_under_throttle)
    throttles.push_back(std::move(tab_under_throttle));

  throttles.push_back(std::make_unique<PolicyBlacklistNavigationThrottle>(
      handle, handle->GetWebContents()->GetBrowserContext()));

  if (base::FeatureList::IsEnabled(features::kSSLCommittedInterstitials)) {
    throttles.push_back(std::make_unique<SSLErrorNavigationThrottle>(
        handle,
        std::make_unique<CertificateReportingServiceCertReporter>(web_contents),
        base::Bind(&SSLErrorHandler::HandleSSLError)));
  }

  std::unique_ptr<content::NavigationThrottle> https_upgrade_timing_throttle =
      TypedNavigationTimingThrottle::MaybeCreateThrottleFor(handle);
  if (https_upgrade_timing_throttle)
    throttles.push_back(std::move(https_upgrade_timing_throttle));

#if !defined(OS_ANDROID)
  std::unique_ptr<content::NavigationThrottle> devtools_throttle =
      DevToolsWindow::MaybeCreateNavigationThrottle(handle);
  if (devtools_throttle)
    throttles.push_back(std::move(devtools_throttle));

  std::unique_ptr<content::NavigationThrottle> new_tab_page_throttle =
      NewTabPageNavigationThrottle::MaybeCreateThrottleFor(handle);
  if (new_tab_page_throttle)
    throttles.push_back(std::move(new_tab_page_throttle));
#endif

  std::unique_ptr<content::NavigationThrottle> previews_lite_page_throttle =
      PreviewsLitePageDecider::MaybeCreateThrottleFor(handle);
  if (previews_lite_page_throttle)
    throttles.push_back(std::move(previews_lite_page_throttle));

#if defined(OS_WIN) || defined(OS_MACOSX) || \
    (defined(OS_LINUX) && !defined(OS_CHROMEOS))
  std::unique_ptr<content::NavigationThrottle> browser_switcher_throttle =
      browser_switcher::BrowserSwitcherNavigationThrottle ::
          MaybeCreateThrottleFor(handle);
  if (browser_switcher_throttle)
    throttles.push_back(std::move(browser_switcher_throttle));
#endif

  return throttles;
}

std::unique_ptr<content::NavigationUIData>
ChromeContentBrowserClient::GetNavigationUIData(
    content::NavigationHandle* navigation_handle) {
  return std::make_unique<ChromeNavigationUIData>(navigation_handle);
}

void ChromeContentBrowserClient::GetHardwareSecureDecryptionCaps(
    const std::string& key_system,
    const base::flat_set<media::CdmProxy::Protocol>& cdm_proxy_protocols,
    base::flat_set<media::VideoCodec>* video_codecs,
    base::flat_set<media::EncryptionMode>* encryption_schemes) {
#if defined(OS_WIN) && BUILDFLAG(ENABLE_LIBRARY_CDMS) && \
    BUILDFLAG(ENABLE_WIDEVINE)
  if (key_system == kWidevineKeySystem) {
    GetWidevineHardwareCaps(cdm_proxy_protocols, video_codecs,
                            encryption_schemes);
  }
#endif
}

content::DevToolsManagerDelegate*
ChromeContentBrowserClient::GetDevToolsManagerDelegate() {
#if defined(OS_ANDROID)
  return new DevToolsManagerDelegateAndroid();
#else
  return new ChromeDevToolsManagerDelegate();
#endif
}

content::TracingDelegate* ChromeContentBrowserClient::GetTracingDelegate() {
  return new ChromeTracingDelegate();
}

bool ChromeContentBrowserClient::IsPluginAllowedToCallRequestOSFileHandle(
    content::BrowserContext* browser_context,
    const GURL& url) {
#if BUILDFLAG(ENABLE_PLUGINS) && BUILDFLAG(ENABLE_EXTENSIONS)
  return ChromeContentBrowserClientPluginsPart::
      IsPluginAllowedToCallRequestOSFileHandle(browser_context, url,
                                               allowed_file_handle_origins_);
#else
  return false;
#endif
}

bool ChromeContentBrowserClient::IsPluginAllowedToUseDevChannelAPIs(
    content::BrowserContext* browser_context,
    const GURL& url) {
#if BUILDFLAG(ENABLE_PLUGINS) && BUILDFLAG(ENABLE_EXTENSIONS)
  return ChromeContentBrowserClientPluginsPart::
      IsPluginAllowedToUseDevChannelAPIs(browser_context, url,
                                         allowed_dev_channel_origins_);
#else
  return false;
#endif
}

void ChromeContentBrowserClient::OverridePageVisibilityState(
    RenderFrameHost* render_frame_host,
    content::PageVisibilityState* visibility_state) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);

  WebContents* web_contents =
      WebContents::FromRenderFrameHost(render_frame_host);
  DCHECK(web_contents);

  prerender::PrerenderManager* prerender_manager =
      prerender::PrerenderManagerFactory::GetForBrowserContext(
          web_contents->GetBrowserContext());
  if (prerender_manager &&
      prerender_manager->IsWebContentsPrerendering(web_contents, nullptr)) {
    *visibility_state = content::PageVisibilityState::kPrerender;
  }
}

void ChromeContentBrowserClient::InitWebContextInterfaces() {
  frame_interfaces_ = std::make_unique<service_manager::BinderRegistry>();
  frame_interfaces_parameterized_ = std::make_unique<
      service_manager::BinderRegistryWithArgs<content::RenderFrameHost*>>();
  worker_interfaces_parameterized_ =
      std::make_unique<service_manager::BinderRegistryWithArgs<
          content::RenderProcessHost*, const url::Origin&>>();

  // Register mojo ContentTranslateDriver interface only for main frame.
  frame_interfaces_parameterized_->AddInterface(base::BindRepeating(
      &ChromeLanguageDetectionTabHelper::BindContentTranslateDriver));

  frame_interfaces_parameterized_->AddInterface(
      base::BindRepeating(&ChromePasswordManagerClient::BindCredentialManager));
  frame_interfaces_parameterized_->AddInterface(
      base::Bind(&InsecureSensitiveInputDriverFactory::BindDriver));

#if defined(OS_ANDROID)
  frame_interfaces_parameterized_->AddInterface(base::Bind(
      &ForwardToJavaFrameRegistry<blink::mojom::InstalledAppProvider>));
  frame_interfaces_parameterized_->AddInterface(
      base::Bind(&ForwardToJavaFrameRegistry<payments::mojom::PaymentRequest>));
  frame_interfaces_parameterized_->AddInterface(
      base::Bind(&ForwardToJavaFrameRegistry<blink::mojom::Authenticator>));
#else
  if (base::FeatureList::IsEnabled(features::kWebPayments)) {
    frame_interfaces_parameterized_->AddInterface(
        base::Bind(&payments::CreatePaymentRequest));
  }
#endif

#if defined(OS_ANDROID)
  frame_interfaces_parameterized_->AddInterface(base::Bind(
      &ForwardToJavaWebContentsRegistry<blink::mojom::ShareService>));
#elif defined(OS_LINUX) || defined(OS_WIN)
  frame_interfaces_->AddInterface(base::Bind(&ShareServiceImpl::Create));
#endif

#if !defined(OS_ANDROID)
  frame_interfaces_->AddInterface(
      base::BindRepeating(&BadgeServiceImpl::Create));
#endif

  frame_interfaces_parameterized_->AddInterface(
      base::BindRepeating(&NavigationPredictor::Create));

#if defined(OS_ANDROID)
  frame_interfaces_parameterized_->AddInterface(
      base::BindRepeating(&offline_pages::OfflinePageAutoFetcher::Create),
      base::CreateSingleThreadTaskRunnerWithTraits({BrowserThread::UI}));
#endif
}

void ChromeContentBrowserClient::MaybeCopyDisableWebRtcEncryptionSwitch(
    base::CommandLine* to_command_line,
    const base::CommandLine& from_command_line,
    version_info::Channel channel) {
#if defined(OS_ANDROID)
  const version_info::Channel kMaxDisableEncryptionChannel =
      version_info::Channel::BETA;
#else
  const version_info::Channel kMaxDisableEncryptionChannel =
      version_info::Channel::DEV;
#endif
  if (channel <= kMaxDisableEncryptionChannel) {
    static const char* const kWebRtcDevSwitchNames[] = {
      switches::kDisableWebRtcEncryption,
    };
    to_command_line->CopySwitchesFrom(from_command_line,
                                      kWebRtcDevSwitchNames,
                                      arraysize(kWebRtcDevSwitchNames));
  }
}

#if BUILDFLAG(ENABLE_MEDIA_REMOTING)
void ChromeContentBrowserClient::CreateMediaRemoter(
    content::RenderFrameHost* render_frame_host,
    media::mojom::RemotingSourcePtr source,
    media::mojom::RemoterRequest request) {
  CastRemotingConnector::CreateMediaRemoter(
      render_frame_host, std::move(source), std::move(request));
}
#endif  // BUILDFLAG(ENABLE_MEDIA_REMOTING)

std::unique_ptr<base::TaskScheduler::InitParams>
ChromeContentBrowserClient::GetTaskSchedulerInitParams() {
  return task_scheduler_util::GetTaskSchedulerInitParamsForBrowser();
}

base::FilePath ChromeContentBrowserClient::GetLoggingFileName(
    const base::CommandLine& command_line) {
  return logging::GetLogFileName(command_line);
}

std::vector<std::unique_ptr<content::URLLoaderThrottle>>
ChromeContentBrowserClient::CreateURLLoaderThrottles(
    const network::ResourceRequest& request,
    content::ResourceContext* resource_context,
    const base::RepeatingCallback<content::WebContents*()>& wc_getter,
    content::NavigationUIData* navigation_ui_data,
    int frame_tree_node_id) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);

  bool network_service_enabled =
      base::FeatureList::IsEnabled(network::features::kNetworkService);
  std::vector<std::unique_ptr<content::URLLoaderThrottle>> result;

  ProfileIOData* io_data = nullptr;
  // Only set |io_data| if needed, as in unit tests |resource_context| is a
  // MockResourceContext and the cast doesn't work.
  if (safe_browsing_service_ ||
      data_reduction_proxy::params::IsEnabledWithNetworkService()) {
    io_data = ProfileIOData::FromResourceContext(resource_context);
  }

  if (io_data && io_data->data_reduction_proxy_io_data() &&
      data_reduction_proxy::params::IsEnabledWithNetworkService()) {
    net::HttpRequestHeaders headers;
    data_reduction_proxy::DataReductionProxyRequestOptions* request_options =
        io_data->data_reduction_proxy_io_data()->request_options();
    request_options->AddPageIDRequestHeader(&headers,
                                            request_options->GeneratePageId());
    result.push_back(std::make_unique<
                     data_reduction_proxy::DataReductionProxyURLLoaderThrottle>(
        headers,
        io_data->data_reduction_proxy_io_data()->GetThrottleManager()));
  }

#if defined(SAFE_BROWSING_DB_LOCAL) || defined(SAFE_BROWSING_DB_REMOTE)
  if (io_data && safe_browsing_service_) {
    bool matches_enterprise_whitelist = safe_browsing::IsURLWhitelistedByPolicy(
        request.url, io_data->safe_browsing_whitelist_domains());
    if (!matches_enterprise_whitelist &&
        (network_service_enabled ||
         base::FeatureList::IsEnabled(
             safe_browsing::kCheckByURLLoaderThrottle))) {
      auto* delegate = GetSafeBrowsingUrlCheckerDelegate(resource_context);
      if (delegate && !delegate->ShouldSkipRequestCheck(
                          resource_context, request.url, frame_tree_node_id,
                          -1 /* render_process_id */, -1 /* render_frame_id */,
                          request.originated_from_service_worker)) {
        auto safe_browsing_throttle =
            safe_browsing::BrowserURLLoaderThrottle::MaybeCreate(delegate,
                                                                 wc_getter);
        if (safe_browsing_throttle)
          result.push_back(std::move(safe_browsing_throttle));
      }
    }
  }
#endif  // defined(SAFE_BROWSING_DB_LOCAL) || defined(SAFE_BROWSING_DB_REMOTE)

  if (network_service_enabled) {
    ChromeNavigationUIData* chrome_navigation_ui_data =
        static_cast<ChromeNavigationUIData*>(navigation_ui_data);
    if (chrome_navigation_ui_data &&
        chrome_navigation_ui_data->prerender_mode() !=
            prerender::NO_PRERENDER) {
      result.push_back(std::make_unique<prerender::PrerenderURLLoaderThrottle>(
          chrome_navigation_ui_data->prerender_mode(),
          chrome_navigation_ui_data->prerender_histogram_prefix(),
          base::BindOnce(GetPrerenderCanceller, wc_getter),
          base::CreateSingleThreadTaskRunnerWithTraits({BrowserThread::UI})));
    }
  }

  if (io_data) {
    bool is_off_the_record = io_data->IsOffTheRecord();
    bool is_signed_in =
        !is_off_the_record &&
        !io_data->google_services_account_id()->GetValue().empty();

    chrome::mojom::DynamicParams dynamic_params = {
        io_data->force_google_safesearch()->GetValue(),
        io_data->force_youtube_restrict()->GetValue(),
        io_data->allowed_domains_for_apps()->GetValue(),
        variations::VariationsHttpHeaderProvider::GetInstance()
            ->GetClientDataHeader(is_signed_in)};
    result.push_back(std::make_unique<GoogleURLLoaderThrottle>(
        is_off_the_record, std::move(dynamic_params)));
  }

#if BUILDFLAG(ENABLE_PLUGINS)
  if (network_service_enabled) {
    result.push_back(
        std::make_unique<PluginResponseInterceptorURLLoaderThrottle>(
            resource_context, request.resource_type, frame_tree_node_id));
  }
#endif

  if (network_service_enabled) {
    auto delegate = std::make_unique<signin::HeaderModificationDelegateImpl>(
        resource_context);
    auto signin_throttle = signin::URLLoaderThrottle::MaybeCreate(
        std::move(delegate), navigation_ui_data, wc_getter);
    if (signin_throttle)
      result.push_back(std::move(signin_throttle));
  }
  return result;
}

void ChromeContentBrowserClient::RegisterNonNetworkNavigationURLLoaderFactories(
    int frame_tree_node_id,
    NonNetworkURLLoaderFactoryMap* factories) {
#if BUILDFLAG(ENABLE_EXTENSIONS) || defined(OS_CHROMEOS)
  content::WebContents* web_contents =
      content::WebContents::FromFrameTreeNodeId(frame_tree_node_id);
#if BUILDFLAG(ENABLE_EXTENSIONS)
  factories->emplace(
      extensions::kExtensionScheme,
      extensions::CreateExtensionNavigationURLLoaderFactory(
          web_contents->GetBrowserContext(),
          !!extensions::WebViewGuest::FromWebContents(web_contents)));
#endif  // BUILDFLAG(ENABLE_EXTENSIONS)
#if defined(OS_CHROMEOS)
  Profile* profile =
      Profile::FromBrowserContext(web_contents->GetBrowserContext());
  factories->emplace(
      content::kExternalFileScheme,
      std::make_unique<chromeos::ExternalFileURLLoaderFactory>(profile));
#endif  // defined(OS_CHROMEOS)
#endif  // BUILDFLAG(ENABLE_EXTENSIONS) || defined(OS_CHROMEOS)
}

namespace {

// The FileURLLoaderFactory provided to the extension background pages.
// Checks with the ChildProcessSecurityPolicy to validate the file access.
class FileURLLoaderFactory : public network::mojom::URLLoaderFactory {
 public:
  explicit FileURLLoaderFactory(int child_id) : child_id_(child_id) {}

 private:
  // network::mojom::URLLoaderFactory:
  void CreateLoaderAndStart(network::mojom::URLLoaderRequest loader,
                            int32_t routing_id,
                            int32_t request_id,
                            uint32_t options,
                            const network::ResourceRequest& request,
                            network::mojom::URLLoaderClientPtr client,
                            const net::MutableNetworkTrafficAnnotationTag&
                                traffic_annotation) override {
    if (!content::ChildProcessSecurityPolicy::GetInstance()->CanRequestURL(
            child_id_, request.url)) {
      client->OnComplete(
          network::URLLoaderCompletionStatus(net::ERR_ACCESS_DENIED));
      return;
    }
    content::CreateFileURLLoader(request, std::move(loader), std::move(client),
                                 /*observer=*/nullptr);
  }

  void Clone(network::mojom::URLLoaderFactoryRequest loader) override {
    bindings_.AddBinding(this, std::move(loader));
  }

  int child_id_;
  mojo::BindingSet<network::mojom::URLLoaderFactory> bindings_;
  DISALLOW_COPY_AND_ASSIGN(FileURLLoaderFactory);
};

}  // namespace

void ChromeContentBrowserClient::
    RegisterNonNetworkSubresourceURLLoaderFactories(
        int render_process_id,
        int render_frame_id,
        NonNetworkURLLoaderFactoryMap* factories) {
#if defined(OS_CHROMEOS) || BUILDFLAG(ENABLE_EXTENSIONS)
  content::RenderFrameHost* frame_host =
      RenderFrameHost::FromID(render_process_id, render_frame_id);
  WebContents* web_contents = WebContents::FromRenderFrameHost(frame_host);
#endif  // defined(OS_CHROMEOS) || BUILDFLAG(ENABLE_EXTENSIONS)

#if defined(OS_CHROMEOS)
  if (web_contents) {
    Profile* profile =
        Profile::FromBrowserContext(web_contents->GetBrowserContext());
    factories->emplace(
        content::kExternalFileScheme,
        std::make_unique<chromeos::ExternalFileURLLoaderFactory>(profile));
  }
#endif  // defined(OS_CHROMEOS)

#if BUILDFLAG(ENABLE_EXTENSIONS)
  auto factory = extensions::CreateExtensionURLLoaderFactory(render_process_id,
                                                             render_frame_id);
  if (factory)
    factories->emplace(extensions::kExtensionScheme, std::move(factory));

  // This logic should match
  // ChromeExtensionWebContentsObserver::RenderFrameCreated.
  if (!web_contents)
    return;

  Profile* profile =
      Profile::FromBrowserContext(web_contents->GetBrowserContext());
  InstantService* instant_service =
      InstantServiceFactory::GetForProfile(profile);
  // The test below matches what's done by ShouldServiceRequestIOThread in
  // local_ntp_source.cc.
  if (instant_service->IsInstantProcess(render_process_id)) {
    factories->emplace(
        chrome::kChromeSearchScheme,
        content::CreateWebUIURLLoader(
            frame_host, chrome::kChromeSearchScheme,
            /*allowed_webui_hosts=*/base::flat_set<std::string>()));
  }

  extensions::ChromeExtensionWebContentsObserver* web_observer =
      extensions::ChromeExtensionWebContentsObserver::FromWebContents(
          web_contents);

  // There is nothing to do if no ChromeExtensionWebContentsObserver is attached
  // to the |web_contents|.
  if (!web_observer)
    return;

  const Extension* extension =
      web_observer->GetExtensionFromFrame(frame_host, false);
  if (!extension)
    return;

  std::vector<std::string> allowed_webui_hosts;
  // Support for chrome:// scheme if appropriate.
  if ((extension->is_extension() || extension->is_platform_app()) &&
      Manifest::IsComponentLocation(extension->location())) {
    // Components of chrome that are implemented as extensions or platform apps
    // are allowed to use chrome://resources/ and chrome://theme/ URLs.
    allowed_webui_hosts.emplace_back(content::kChromeUIResourcesHost);
    allowed_webui_hosts.emplace_back(chrome::kChromeUIThemeHost);
  }
  if (extension->is_extension() || extension->is_legacy_packaged_app() ||
      (extension->is_platform_app() &&
       Manifest::IsComponentLocation(extension->location()))) {
    // Extensions, legacy packaged apps, and component platform apps are allowed
    // to use chrome://favicon/ and chrome://extension-icon/ URLs. Hosted apps
    // are not allowed because they are served via web servers (and are
    // generally never given access to Chrome APIs).
    allowed_webui_hosts.emplace_back(chrome::kChromeUIExtensionIconHost);
    allowed_webui_hosts.emplace_back(chrome::kChromeUIFaviconHost);
  }
  if (!allowed_webui_hosts.empty()) {
    factories->emplace(
        content::kChromeUIScheme,
        content::CreateWebUIURLLoader(frame_host, content::kChromeUIScheme,
                                      std::move(allowed_webui_hosts)));
  }

  // Extension with a background page get file access that gets approval from
  // ChildProcessSecurityPolicy.
  extensions::ExtensionHost* host =
      extensions::ProcessManager::Get(web_contents->GetBrowserContext())
          ->GetBackgroundHostForExtension(extension->id());
  if (host) {
    factories->emplace(url::kFileScheme, std::make_unique<FileURLLoaderFactory>(
                                             render_process_id));
  }
#endif  // BUILDFLAG(ENABLE_EXTENSIONS)
}

bool ChromeContentBrowserClient::WillCreateURLLoaderFactory(
    content::BrowserContext* browser_context,
    content::RenderFrameHost* frame,
    int render_process_id,
    bool is_navigation,
    const url::Origin& request_initiator,
    network::mojom::URLLoaderFactoryRequest* factory_request,
    network::mojom::TrustedURLLoaderHeaderClientPtrInfo* header_client,
    bool* bypass_redirect_checks) {
  DCHECK(base::FeatureList::IsEnabled(network::features::kNetworkService));
  bool use_proxy = false;

#if BUILDFLAG(ENABLE_EXTENSIONS)
  auto* web_request_api =
      extensions::BrowserContextKeyedAPIFactory<extensions::WebRequestAPI>::Get(
          browser_context);

  // NOTE: Some unit test environments do not initialize
  // BrowserContextKeyedAPI factories for e.g. WebRequest.
  if (web_request_api) {
    bool use_proxy_for_web_request =
        web_request_api->MaybeProxyURLLoaderFactory(
            browser_context, frame, render_process_id, is_navigation,
            factory_request, header_client);
    if (bypass_redirect_checks)
      *bypass_redirect_checks = use_proxy_for_web_request;
    use_proxy |= use_proxy_for_web_request;
  }
#endif

  use_proxy |= signin::ProxyingURLLoaderFactory::MaybeProxyRequest(
      frame, is_navigation, request_initiator, factory_request);

  return use_proxy;
}

std::vector<std::unique_ptr<content::URLLoaderRequestInterceptor>>
ChromeContentBrowserClient::WillCreateURLLoaderRequestInterceptors(
    content::NavigationUIData* navigation_ui_data,
    int frame_tree_node_id) {
  std::vector<std::unique_ptr<content::URLLoaderRequestInterceptor>>
      interceptors;
#if BUILDFLAG(ENABLE_OFFLINE_PAGES)
  interceptors.push_back(
      std::make_unique<offline_pages::OfflinePageURLLoaderRequestInterceptor>(
          navigation_ui_data, frame_tree_node_id));
#endif
  return interceptors;
}

void ChromeContentBrowserClient::WillCreateWebSocket(
    content::RenderFrameHost* frame,
    network::mojom::WebSocketRequest* request,
    network::mojom::AuthenticationHandlerPtr* auth_handler) {
#if BUILDFLAG(ENABLE_EXTENSIONS)
  auto* web_request_api =
      extensions::BrowserContextKeyedAPIFactory<extensions::WebRequestAPI>::Get(
          frame->GetProcess()->GetBrowserContext());

  // NOTE: Some unit test environments do not initialize
  // BrowserContextKeyedAPI factories for e.g. WebRequest.
  if (!web_request_api)
    return;

  web_request_api->MaybeProxyWebSocket(frame, request, auth_handler);
#endif
}

void ChromeContentBrowserClient::OnNetworkServiceCreated(
    network::mojom::NetworkService* network_service) {
  if (!base::FeatureList::IsEnabled(network::features::kNetworkService))
    return;

  PrefService* local_state;
  if (g_browser_process) {
    DCHECK(g_browser_process->local_state());
    local_state = g_browser_process->local_state();
  } else {
    DCHECK(chrome_feature_list_creator_->local_state());
    local_state = chrome_feature_list_creator_->local_state();
  }

  if (!data_use_measurement::ChromeDataUseMeasurement::GetInstance())
    data_use_measurement::ChromeDataUseMeasurement::CreateInstance(local_state);

  if (!SystemNetworkContextManager::GetInstance()) {
    DCHECK(!g_browser_process);
    SystemNetworkContextManager::CreateInstance(local_state);
  }
  // Need to set up global NetworkService state before anything else uses it.
  SystemNetworkContextManager::GetInstance()->OnNetworkServiceCreated(
      network_service);
}

network::mojom::NetworkContextPtr
ChromeContentBrowserClient::CreateNetworkContext(
    content::BrowserContext* context,
    bool in_memory,
    const base::FilePath& relative_partition_path) {
  Profile* profile = Profile::FromBrowserContext(context);
  return profile->CreateNetworkContext(in_memory, relative_partition_path);
}

bool ChromeContentBrowserClient::AllowRenderingMhtmlOverHttp(
    content::NavigationUIData* navigation_ui_data) {
#if BUILDFLAG(ENABLE_OFFLINE_PAGES)
  // It is OK to load the saved offline copy, in MHTML format.
  ChromeNavigationUIData* chrome_navigation_ui_data =
      static_cast<ChromeNavigationUIData*>(navigation_ui_data);
  if (!chrome_navigation_ui_data)
    return false;
  offline_pages::OfflinePageNavigationUIData* offline_page_data =
      chrome_navigation_ui_data->GetOfflinePageNavigationUIData();
  return offline_page_data && offline_page_data->is_offline_page();
#else
  return false;
#endif
}

bool ChromeContentBrowserClient::ShouldForceDownloadResource(
    const GURL& url,
    const std::string& mime_type) {
#if BUILDFLAG(ENABLE_EXTENSIONS)
  // Special-case user scripts to get downloaded instead of viewed.
  return extensions::UserScript::IsURLUserScript(url, mime_type);
#else
  return false;
#endif
}

void ChromeContentBrowserClient::CreateWebUsbService(
    content::RenderFrameHost* render_frame_host,
    mojo::InterfaceRequest<blink::mojom::WebUsbService> request) {
  if (!base::FeatureList::IsEnabled(features::kWebUsb))
    return;

#if BUILDFLAG(ENABLE_EXTENSIONS)
  // WebUSB is not supported in Apps/Extensions. https://crbug.com/770896
  if (render_frame_host->GetSiteInstance()->GetSiteURL().SchemeIs(
          extensions::kExtensionScheme)) {
    return;
  }
#endif

  WebContents* web_contents =
      WebContents::FromRenderFrameHost(render_frame_host);
  if (!web_contents) {
    NOTREACHED();
    return;
  }

  UsbTabHelper* tab_helper =
      UsbTabHelper::GetOrCreateForWebContents(web_contents);
  tab_helper->CreateWebUsbService(render_frame_host, std::move(request));
}

std::unique_ptr<content::AuthenticatorRequestClientDelegate>
ChromeContentBrowserClient::GetWebAuthenticationRequestDelegate(
    content::RenderFrameHost* render_frame_host) {
  return AuthenticatorRequestScheduler::CreateRequestDelegate(
      render_frame_host);
}

#if defined(OS_MACOSX)
bool ChromeContentBrowserClient::
    IsWebAuthenticationTouchIdAuthenticatorSupported() {
  return true;
}
#endif

std::unique_ptr<net::ClientCertStore>
ChromeContentBrowserClient::CreateClientCertStore(
    content::ResourceContext* resource_context) {
  if (!resource_context)
    return nullptr;
  return ProfileIOData::FromResourceContext(resource_context)
      ->CreateClientCertStore();
}

scoped_refptr<content::LoginDelegate>
ChromeContentBrowserClient::CreateLoginDelegate(
    net::AuthChallengeInfo* auth_info,
    content::ResourceRequestInfo::WebContentsGetter web_contents_getter,
    const content::GlobalRequestID& request_id,
    bool is_request_for_main_frame,
    const GURL& url,
    scoped_refptr<net::HttpResponseHeaders> response_headers,
    bool first_auth_attempt,
    LoginAuthRequiredCallback auth_required_callback) {
  return CreateLoginPrompt(
      auth_info, web_contents_getter, request_id, is_request_for_main_frame,
      url, std::move(response_headers), std::move(auth_required_callback));
}

bool ChromeContentBrowserClient::HandleExternalProtocol(
    const GURL& url,
    content::ResourceRequestInfo::WebContentsGetter web_contents_getter,
    int child_id,
    content::NavigationUIData* navigation_data,
    bool is_main_frame,
    ui::PageTransition page_transition,
    bool has_user_gesture,
    const std::string& method,
    const net::HttpRequestHeaders& headers) {
#if BUILDFLAG(ENABLE_EXTENSIONS)
  // External protocols are disabled for guests. An exception is made for the
  // "mailto" protocol, so that pages that utilize it work properly in a
  // WebView.
  ChromeNavigationUIData* chrome_data =
      static_cast<ChromeNavigationUIData*>(navigation_data);
  if ((extensions::WebViewRendererState::GetInstance()->IsGuest(child_id) ||
       (chrome_data &&
        chrome_data->GetExtensionNavigationUIData()->is_web_view())) &&
      !url.SchemeIs(url::kMailToScheme)) {
    return false;
  }
#endif  // BUILDFLAG(ENABLE_EXTENSIONS)

#if defined(OS_ANDROID)
  // Main frame external protocols are handled by
  // InterceptNavigationResourceThrottle.
  if (is_main_frame)
    return false;
#endif  // defined(ANDROID)

  base::PostTaskWithTraits(FROM_HERE, {BrowserThread::UI},
                           base::BindOnce(&LaunchURL, url, web_contents_getter,
                                          page_transition, has_user_gesture));
  return true;
}

std::unique_ptr<content::OverlayWindow>
ChromeContentBrowserClient::CreateWindowForPictureInPicture(
    content::PictureInPictureWindowController* controller) {
#if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_LINUX) || \
    defined(OS_CHROMEOS)
  // Note: content::OverlayWindow::Create() is defined by platform-specific
  // implementation in chrome/browser/ui/views. This layering hack, which goes
  // through //content and ContentBrowserClient, allows us to work around the
  // dependency constraints that disallow directly calling
  // chrome/browser/ui/views code either from here or from other code in
  // chrome/browser.
  return content::OverlayWindow::Create(controller);
#else
  return nullptr;
#endif
}

bool ChromeContentBrowserClient::IsSafeRedirectTarget(
    const GURL& url,
    content::ResourceContext* context) {
#if BUILDFLAG(ENABLE_EXTENSIONS)
  if (url.SchemeIs(extensions::kExtensionScheme)) {
    ProfileIOData* io_data = ProfileIOData::FromResourceContext(context);
    const Extension* extension =
        io_data->GetExtensionInfoMap()->extensions().GetByID(url.host());
    if (!extension)
      return false;
    return extensions::WebAccessibleResourcesInfo::IsResourceWebAccessible(
        extension, url.path());
  }
#endif  // BUILDFLAG(ENABLE_EXTENSIONS)
  return true;
}

void ChromeContentBrowserClient::RegisterRendererPreferenceWatcherForWorkers(
    content::BrowserContext* browser_context,
    content::mojom::RendererPreferenceWatcherPtr watcher) {
  Profile* profile = Profile::FromBrowserContext(browser_context);
  PrefWatcher::Get(profile)->RegisterWatcherForWorkers(std::move(watcher));
}

// Static; handles rewriting Web UI URLs.
bool ChromeContentBrowserClient::HandleWebUI(
    GURL* url,
    content::BrowserContext* browser_context) {
  // Rewrite chrome://help and chrome://chrome to chrome://settings/help.
  if (url->SchemeIs(content::kChromeUIScheme) &&
      (url->host() == chrome::kChromeUIHelpHost ||
       (url->host() == chrome::kChromeUIUberHost &&
        (url->path().empty() || url->path() == "/")))) {
    *url = ReplaceURLHostAndPath(*url, chrome::kChromeUISettingsHost,
                                 chrome::kChromeUIHelpHost);
    return true;  // Return true to update the displayed URL.
  }

  if (!ChromeWebUIControllerFactory::GetInstance()->UseWebUIForURL(
          browser_context, *url)) {
    return false;
  }

#if defined(OS_CHROMEOS)
  // Special case : in ChromeOS in Guest mode bookmarks and history are
  // disabled for security reasons. New tab page explains the reasons, so
  // we redirect user to new tab page.
  if (user_manager::UserManager::Get()->IsLoggedInAsGuest()) {
    if (url->SchemeIs(content::kChromeUIScheme) &&
        (url->DomainIs(chrome::kChromeUIBookmarksHost) ||
         url->DomainIs(chrome::kChromeUIHistoryHost))) {
      // Rewrite with new tab URL
      *url = GURL(chrome::kChromeUINewTabURL);
    }
  }
#endif

  return true;
}

bool ChromeContentBrowserClient::ShowPaymentHandlerWindow(
    content::BrowserContext* browser_context,
    const GURL& url,
    base::OnceCallback<void(bool, int, int)> callback) {
#if defined(OS_ANDROID)
  return false;
#else
  payments::PaymentRequestDisplayManagerFactory::GetInstance()
      ->GetForBrowserContext(browser_context)
      ->ShowPaymentHandlerWindow(url, std::move(callback));
  return true;
#endif
}

// Static; reverse URL handler for Web UI. Maps "chrome://chrome/foo/" to
// "chrome://foo/".
bool ChromeContentBrowserClient::HandleWebUIReverse(
    GURL* url,
    content::BrowserContext* browser_context) {
  // No need to actually reverse-rewrite the URL, but return true to update the
  // displayed URL when rewriting chrome://help to chrome://settings/help.
  return url->SchemeIs(content::kChromeUIScheme) &&
         url->host() == chrome::kChromeUISettingsHost;
}

// static
void ChromeContentBrowserClient::SetDefaultQuotaSettingsForTesting(
    const storage::QuotaSettings* settings) {
  g_default_quota_settings = settings;
}

safe_browsing::UrlCheckerDelegate*
ChromeContentBrowserClient::GetSafeBrowsingUrlCheckerDelegate(
    content::ResourceContext* resource_context) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);

  ProfileIOData* io_data = ProfileIOData::FromResourceContext(resource_context);
  if (!io_data->safe_browsing_enabled()->GetValue())
    return nullptr;

  // |safe_browsing_service_| may be unavailable in tests.
  if (safe_browsing_service_ && !safe_browsing_url_checker_delegate_) {
    safe_browsing_url_checker_delegate_ =
        base::MakeRefCounted<safe_browsing::UrlCheckerDelegateImpl>(
            safe_browsing_service_->database_manager(),
            safe_browsing_service_->ui_manager());
  }

  return safe_browsing_url_checker_delegate_.get();
}

base::Optional<std::string>
ChromeContentBrowserClient::GetOriginPolicyErrorPage(
    content::OriginPolicyErrorReason error_reason,
    const url::Origin& origin,
    const GURL& url) {
  return security_interstitials::OriginPolicyUI::GetErrorPage(error_reason,
                                                              origin, url);
}

bool ChromeContentBrowserClient::CanIgnoreCertificateErrorIfNeeded() {
  // We require --user-data-dir flag too so that no dangerous changes are made
  // in the user's regular profile.
  return base::CommandLine::ForCurrentProcess()->HasSwitch(
      switches::kUserDataDir);
}

void ChromeContentBrowserClient::OnNetworkServiceDataUseUpdate(
    int32_t network_traffic_annotation_id_hash,
    int64_t recv_bytes,
    int64_t sent_bytes) {
  if (data_use_measurement::ChromeDataUseMeasurement::GetInstance()) {
    data_use_measurement::ChromeDataUseMeasurement::GetInstance()
        ->ReportNetworkServiceDataUse(network_traffic_annotation_id_hash,
                                      recv_bytes, sent_bytes);
  }
}

content::PreviewsState ChromeContentBrowserClient::DetermineAllowedPreviews(
    content::PreviewsState initial_state,
    content::NavigationHandle* navigation_handle,
    const GURL& current_navigation_url) {
  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);

  // If this is not a main frame, return the initial state. If there are no
  // previews in the state, return the state as is.
  if (!navigation_handle->IsInMainFrame() ||
      navigation_handle->IsSameDocument()) {
    return initial_state;
  }

  if (!current_navigation_url.SchemeIsHTTPOrHTTPS()) {
    return content::PREVIEWS_OFF;
  }

  content::WebContents* web_contents = navigation_handle->GetWebContents();
  content::WebContentsDelegate* delegate = web_contents->GetDelegate();

  auto* browser_context = web_contents->GetBrowserContext();

  PreviewsService* previews_service = PreviewsServiceFactory::GetForProfile(
      Profile::FromBrowserContext(browser_context));
  auto* data_reduction_proxy_settings =
      DataReductionProxyChromeSettingsFactory::GetForBrowserContext(
          browser_context);
  // If the profile does not support previews or Data Saver, do not turn on
  // Previews.
  if (!previews_service || !previews_service->previews_ui_service() ||
      !data_reduction_proxy_settings) {
    return content::PREVIEWS_OFF;
  }

  PreviewsUITabHelper* ui_tab_helper =
      PreviewsUITabHelper::FromWebContents(web_contents);
  // If this tab does not have a PreviewsUITabHelper, no preview should be
  // served.
  if (!ui_tab_helper)
    return content::PREVIEWS_OFF;

  DCHECK(!browser_context->IsOffTheRecord());

  // Other previews objects should all exist and be initialized if we have made
  // it past earlier checks.
  previews::PreviewsDeciderImpl* previews_decider_impl =
      previews_service->previews_ui_service()->previews_decider_impl();
  DCHECK(previews_decider_impl);

  // Start with an unspecified state.
  content::PreviewsState previews_state = content::PREVIEWS_UNSPECIFIED;

  previews::PreviewsUserData* previews_data =
      ui_tab_helper->GetPreviewsUserData(navigation_handle);

  // Certain PreviewsStates are used within URLLoaders (Offline, server
  // previews) and cannot re-evaluate PreviewsState during a redirect, so they
  // should not change. Assume this is a redirect when PreviewsUserData already
  // exists and a Lite Page Redirect preview is not being attempted, since it
  // may also create a previews_data before this point.
  bool is_redirect = false;
  if (previews_data) {
    is_redirect = !previews_data->server_lite_page_info();
  } else {
    previews_data = ui_tab_helper->CreatePreviewsUserDataForNavigationHandle(
        navigation_handle, previews_decider_impl->GeneratePageId());
  }

  DCHECK(previews_data);

  bool is_reload =
      navigation_handle->GetReloadType() != content::ReloadType::NONE;

  content::PreviewsState server_previews_enabled_state =
      content::SERVER_LOFI_ON | content::SERVER_LITE_PAGE_ON;

  // For now, treat server previews types as a single decision, and do not
  // re-evaluate upon redirect. Plumbing does not exist to modify the CPAT
  // header, nor does the plumbing exist to modify the PreviewsState within the
  // URLLoader.
  if (is_redirect) {
    // Copy the server state that was used before the redirect for the initial
    // URL.
    previews_state |= (previews_data->allowed_previews_state() &
                       server_previews_enabled_state);
  } else {
    if (previews_decider_impl->ShouldAllowPreviewAtNavigationStart(
            previews_data, current_navigation_url, is_reload,
            previews::PreviewsType::LITE_PAGE)) {
      previews_state |= server_previews_enabled_state;
    }
  }

  // Evaluate client LoFi, Offline, NoScript, and ResourceBlocking previews.
  previews_state |= previews::DetermineAllowedClientPreviewsState(
      previews_data, current_navigation_url, is_reload, is_redirect,
      data_reduction_proxy_settings->IsDataReductionProxyEnabled(),
      previews_decider_impl);

  if (previews_state & content::PREVIEWS_OFF) {
    previews_data->set_allowed_previews_state(content::PREVIEWS_OFF);
    return content::PREVIEWS_OFF;
  }

  if (previews_state & content::PREVIEWS_NO_TRANSFORM) {
    previews_data->set_allowed_previews_state(content::PREVIEWS_NO_TRANSFORM);
    return content::PREVIEWS_NO_TRANSFORM;
  }

  // At this point, if no Preview is allowed, don't allow previews.
  if (previews_state == content::PREVIEWS_UNSPECIFIED) {
    previews_data->set_allowed_previews_state(content::PREVIEWS_OFF);
    return content::PREVIEWS_OFF;
  }

  content::PreviewsState embedder_state = content::PREVIEWS_UNSPECIFIED;
  if (delegate) {
    delegate->AdjustPreviewsStateForNavigation(web_contents, &embedder_state);
  }

  // If the allowed previews are limited by the embedder, ensure previews honors
  // those limits.
  if (embedder_state != content::PREVIEWS_UNSPECIFIED) {
    previews_state = previews_state & embedder_state;
    // If no valid previews are left, set the state explicitly to PREVIEWS_OFF.
    if (previews_state == content::PREVIEWS_UNSPECIFIED)
      previews_state = content::PREVIEWS_OFF;
  }
  previews_data->set_allowed_previews_state(previews_state);
  return previews_state;
}

// static
content::PreviewsState
ChromeContentBrowserClient::DetermineCommittedPreviewsForURL(
    const GURL& url,
    data_reduction_proxy::DataReductionProxyData* drp_data,
    previews::PreviewsUserData* previews_user_data,
    const previews::PreviewsDecider* previews_decider,
    content::PreviewsState initial_state) {
  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
  if (!previews::HasEnabledPreviews(initial_state))
    return content::PREVIEWS_OFF;

  // Check if the server sent a preview directive.
  content::PreviewsState previews_state =
      data_reduction_proxy::ContentLoFiDecider::
          DetermineCommittedServerPreviewsState(drp_data, initial_state);

  // Check the various other client previews types.
  return previews::DetermineCommittedClientPreviewsState(
      previews_user_data, url, previews_state, previews_decider);
}

content::PreviewsState ChromeContentBrowserClient::DetermineCommittedPreviews(
    content::PreviewsState initial_state,
    content::NavigationHandle* navigation_handle,
    const net::HttpResponseHeaders* response_headers) {
  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
  // Only support HTTP and HTTPS.
  if (navigation_handle->IsErrorPage() ||
      !navigation_handle->GetURL().SchemeIsHTTPOrHTTPS()) {
    return content::PREVIEWS_OFF;
  }

  // If this is not a main frame, return the initial state. If there are no
  // previews in the state, return the state as is.
  if (!previews::HasEnabledPreviews(initial_state) ||
      !navigation_handle->IsInMainFrame() ||
      navigation_handle->IsSameDocument()) {
    return initial_state;
  }

  // WebContents that don't have a PreviewsUITabHelper are not supported.
  PreviewsUITabHelper* ui_tab_helper =
      PreviewsUITabHelper::FromWebContents(navigation_handle->GetWebContents());
  if (!ui_tab_helper)
    return content::PREVIEWS_OFF;

  // If we did not previously create a PreviewsUserData, do not go any further.
  previews::PreviewsUserData* previews_user_data =
      ui_tab_helper->GetPreviewsUserData(navigation_handle);
  if (!previews_user_data)
    return content::PREVIEWS_OFF;

  PreviewsService* previews_service =
      PreviewsServiceFactory::GetForProfile(Profile::FromBrowserContext(
          navigation_handle->GetWebContents()->GetBrowserContext()));

  if (!previews_service || !previews_service->previews_ui_service())
    return content::PREVIEWS_OFF;

// Check if offline previews are being used and set it in the user data.
#if BUILDFLAG(ENABLE_OFFLINE_PAGES)
  offline_pages::OfflinePageTabHelper* tab_helper =
      offline_pages::OfflinePageTabHelper::FromWebContents(
          navigation_handle->GetWebContents());

  previews_user_data->set_offline_preview_used(
      tab_helper && tab_helper->GetOfflinePreviewItem());
#endif  // BUILDFLAG(ENABLE_OFFLINE_PAGES)

  // Annotate request if no-transform directive found in response headers.
  if (response_headers &&
      response_headers->HasHeaderValue("cache-control", "no-transform")) {
    previews_user_data->set_cache_control_no_transform_directive();
  }

  previews::PreviewsDeciderImpl* previews_decider_impl =
      previews_service->previews_ui_service()->previews_decider_impl();
  DCHECK(previews_decider_impl);

  std::unique_ptr<data_reduction_proxy::DataReductionProxyData> drp_data;
  auto* settings =
      DataReductionProxyChromeSettingsFactory::GetForBrowserContext(
          navigation_handle->GetWebContents()->GetBrowserContext());
  if (settings) {
    // TODO(898326): |drp_data| may be incomplete because |navigation_handle|
    // does not yet have all the response information.
    drp_data = settings->CreateDataFromNavigationHandle(navigation_handle,
                                                        response_headers);
  }

  // Determine effective PreviewsState for this committed main frame response.
  content::PreviewsState committed_state = DetermineCommittedPreviewsForURL(
      navigation_handle->GetURL(), drp_data.get(), previews_user_data,
      previews_decider_impl, initial_state);

  // Double check that we never serve a preview when we have a
  // cache-control:no-transform directive.
  DCHECK(!previews_user_data->cache_control_no_transform_directive() ||
         !previews::HasEnabledPreviews(committed_state));

  previews_user_data->set_committed_previews_state(committed_state);

  previews::PreviewsType committed_type =
      previews::GetMainFramePreviewsType(committed_state);

  // Capture committed previews type, if any, in PreviewsUserData.
  // Note: this is for the subset of previews types that are decided upon
  // navigation commit. Previews types that are determined prior to
  // navigation (such as for offline pages or for redirecting to another
  // url), are not set here.
  previews_user_data->SetCommittedPreviewsType(committed_type);

  // Log the commit decision.
  std::vector<previews::PreviewsEligibilityReason> passed_reasons;
  previews_decider_impl->LogPreviewDecisionMade(
      (previews_user_data->cache_control_no_transform_directive()
           ? previews::PreviewsEligibilityReason::CACHE_CONTROL_NO_TRANSFORM
           : previews::PreviewsEligibilityReason::COMMITTED),
      navigation_handle->GetURL(), base::Time::Now(),
      previews_user_data->committed_previews_type(), std::move(passed_reasons),
      previews_user_data->page_id());

  return committed_state;
}

void ChromeContentBrowserClient::LogWebFeatureForCurrentPage(
    content::RenderFrameHost* render_frame_host,
    blink::mojom::WebFeature feature) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);
  page_load_metrics::mojom::PageLoadFeatures new_features({feature}, {}, {});
  page_load_metrics::MetricsWebContentsObserver::RecordFeatureUsage(
      render_frame_host, new_features);
}

std::string ChromeContentBrowserClient::GetProduct() const {
  return ::GetProduct();
}

std::string ChromeContentBrowserClient::GetUserAgent() const {
  return ::GetUserAgent();
}