// 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/lazy_instance.h"
#include "base/macros.h"
#include "base/metrics/field_trial_params.h"
#include "base/metrics/histogram_macros.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/sys_info.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/browser_shutdown.h"
#include "chrome/browser/browsing_data/browsing_data_helper.h"
#include "chrome/browser/browsing_data/chrome_browsing_data_remover_delegate.h"
#include "chrome/browser/budget_service/budget_service_impl.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/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/media/platform_verification_impl.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/media_capture_devices_dispatcher.h"
#include "chrome/browser/memory/chrome_memory_coordinator_delegate.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/net/profile_network_context_service.h"
#include "chrome/browser/net/profile_network_context_service_factory.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/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/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/printing/printing_message_filter.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/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/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/speech/chrome_speech_recognition_manager_delegate.h"
#include "chrome/browser/speech/tts_controller.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/ui/blocked_content/blocked_window_params.h"
#include "chrome/browser/ui/blocked_content/popup_blocker_tab_helper.h"
#include "chrome/browser/ui/blocked_content/tab_under_navigation_throttle.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/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/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_switches.h"
#include "chrome/common/constants.mojom.h"
#include "chrome/common/env_vars.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/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/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/browser/google_util.h"
#include "components/metrics/call_stack_profile_collector.h"
#include "components/metrics/client_info.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/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/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/services/heap_profiling/public/mojom/constants.mojom.h"
#include "components/services/patch/public/interfaces/constants.mojom.h"
#include "components/services/unzip/public/interfaces/constants.mojom.h"
#include "components/signin/core/browser/profile_management_switches.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_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_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/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/vpn_service_proxy.h"
#include "content/public/browser/web_contents.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/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/web_preferences.h"
#include "device/usb/public/mojom/chooser_service.mojom.h"
#include "device/usb/public/mojom/device_manager.mojom.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/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/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/mojom/page/page_visibility_state.mojom.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 "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/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"
#elif defined(OS_CHROMEOS)
#include "ash/public/interfaces/constants.mojom.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/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/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/profiles/profile_helper.h"
#include "chrome/browser/chromeos/system/input_device_settings.h"
#include "chrome/browser/mash_service_registry.h"
#include "chrome/browser/ui/ash/chrome_browser_main_extra_parts_ash.h"
#include "chrome/browser/ui/browser_dialogs.h"
#include "chrome/browser/ui/browser_finder.h"
#include "chromeos/chromeos_constants.h"
#include "chromeos/chromeos_switches.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/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/common/descriptors_android.h"
#include "chrome/services/media_gallery_util/public/mojom/constants.mojom.h"
#include "components/crash/content/browser/crash_dump_observer_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/platform/modules/payments/payment_request.mojom.h"
#include "third_party/blink/public/platform/modules/webauth/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/devtools/chrome_devtools_manager_delegate.h"
#include "chrome/browser/devtools/devtools_window.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"
#endif

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

#if defined(OS_POSIX) && !defined(OS_MACOSX)
#include "base/debug/leak_annotations.h"
#include "components/crash/content/app/breakpad_linux.h"
#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_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/speech/extension_api/tts_engine_extension_api.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_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/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/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/permissions/permissions_data.h"
#include "extensions/common/permissions/socket_permission.h"
#include "extensions/common/switches.h"
#endif

#if BUILDFLAG(ENABLE_EXTENSIONS)
#include "chrome/browser/media/cast_transport_host_filter.h"
#endif  // BUILDFLAG(ENABLE_EXTENSIONS)

#if BUILDFLAG(ENABLE_MUS)
#include "services/ui/public/interfaces/constants.mojom.h"
#endif

#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_WEBRTC)
#include "chrome/browser/media/webrtc/audio_debug_recordings_handler.h"
#include "chrome/browser/media/webrtc/webrtc_logging_handler_host.h"
#endif

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

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

#if BUILDFLAG(ENABLE_MOJO_MEDIA)
#include "chrome/browser/media/output_protection_impl.h"
#if BUILDFLAG(ENABLE_MOJO_CDM) && defined(OS_ANDROID)
#include "chrome/browser/media/android/cdm/media_drm_storage_factory.h"
#endif
#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 defined(FULL_SAFE_BROWSING) || defined(OS_CHROMEOS)
#include "chrome/services/file_util/public/mojom/constants.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 {

// Cached version of the locale so we can return the locale on the I/O
// thread.
base::LazyInstance<std::string>::DestructorAtExit
    g_io_thread_application_locale = LAZY_INSTANCE_INITIALIZER;

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
};

// 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_POSIX) && !defined(OS_ANDROID) && !defined(OS_MACOSX)
breakpad::CrashHandlerHostLinux* CreateCrashHandlerHost(
    const std::string& process_type) {
  base::FilePath dumps_path;
  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();
  }

  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_POSIX) && !defined(OS_ANDROID) && !defined(OS_MACOSX)

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

#endif  // defined(OS_ANDROID)

#if BUILDFLAG(ENABLE_EXTENSIONS)
// By default, JavaScript, images and autoplay are enabled in guest content.
void GetGuestViewDefaultContentSettingRules(
    bool incognito,
    RendererContentSettingRules* rules) {
  rules->image_rules.push_back(ContentSettingPatternSource(
      ContentSettingsPattern::Wildcard(), ContentSettingsPattern::Wildcard(),
      base::Value::FromUniquePtrValue(
          content_settings::ContentSettingToValue(CONTENT_SETTING_ALLOW)),
      std::string(), incognito));

  rules->script_rules.push_back(ContentSettingPatternSource(
      ContentSettingsPattern::Wildcard(), ContentSettingsPattern::Wildcard(),
      base::Value::FromUniquePtrValue(
          content_settings::ContentSettingToValue(CONTENT_SETTING_ALLOW)),
      std::string(), incognito));
  rules->autoplay_rules.push_back(ContentSettingPatternSource(
      ContentSettingsPattern::Wildcard(), ContentSettingsPattern::Wildcard(),
      base::Value::FromUniquePtrValue(
          content_settings::ContentSettingToValue(CONTENT_SETTING_ALLOW)),
      std::string(), incognito));
  rules->client_hints_rules.push_back(ContentSettingPatternSource(
      ContentSettingsPattern::Wildcard(), ContentSettingsPattern::Wildcard(),
      base::Value::FromUniquePtrValue(
          content_settings::ContentSettingToValue(CONTENT_SETTING_BLOCK)),
      std::string(), incognito));
}

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)

void CreateBudgetService(blink::mojom::BudgetServiceRequest request,
                         content::RenderFrameHost* render_frame_host) {
  BudgetServiceImpl::Create(std::move(request), render_frame_host->GetProcess(),
                            render_frame_host->GetLastCommittedOrigin());
}

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

#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::Bind(std::move(callback), result));
}
#endif

// Gets the URL request context getter for the browser process.
// Must be called on the UI thread.
scoped_refptr<net::URLRequestContextGetter>
GetSystemRequestContextOnUIThread() {
  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
  return scoped_refptr<net::URLRequestContextGetter>(
      g_browser_process->system_request_context());
}

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);
}

// Returns true iff |rp_id| is listed in the SecurityKeyPermitAttestation
// policy.
bool IsWebauthnRPIDListedInEnterprisePolicy(
    content::BrowserContext* browser_context,
    const std::string& rp_id) {
#if defined(OS_ANDROID)
  return false;
#else
  const Profile* profile = Profile::FromBrowserContext(browser_context);
  const PrefService* prefs = profile->GetPrefs();
  const base::ListValue* permit_attestation =
      prefs->GetList(prefs::kSecurityKeyPermitAttestation);

  return std::any_of(
      permit_attestation->begin(), permit_attestation->end(),
      [&rp_id](const base::Value& v) { return v.GetString() == rp_id; });
#endif
}

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::GetForProfile(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);
  }
}

}  // namespace

ChromeContentBrowserClient::ChromeContentBrowserClient()
    : 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_ANDROID)
  TtsExtensionEngine* tts_extension_engine = TtsExtensionEngine::GetInstance();
  TtsController::GetInstance()->SetTtsEngineDelegate(tts_extension_engine);
#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,
                 metrics::CallStackProfileParams::GPU_PROCESS));
}

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::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)) {
    g_io_thread_application_locale.Get() = 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);

  BrowserThread::PostTask(
      BrowserThread::IO, FROM_HERE,
      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);
#elif defined(OS_MACOSX)
  main_parts = new ChromeBrowserMainPartsMac(parameters);
#elif defined(OS_CHROMEOS)
  main_parts = new chromeos::ChromeBrowserMainPartsChromeos(parameters);
#elif defined(OS_LINUX)
  main_parts = new ChromeBrowserMainPartsLinux(parameters);
#elif defined(OS_ANDROID)
  main_parts = new ChromeBrowserMainPartsAndroid(parameters);
#elif defined(OS_POSIX)
  main_parts = new ChromeBrowserMainPartsPosix(parameters);
#else
  NOTREACHED();
  main_parts = new ChromeBrowserMainParts(parameters);
#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(profile));
#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()));
#if BUILDFLAG(ENABLE_WEBRTC)
  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));

#endif
#if BUILDFLAG(ENABLE_NACL)
  net::URLRequestContextGetter* context =
      host->GetStoragePartition()->GetURLRequestContext();
  host->AddFilter(new nacl::NaClHostMessageFilter(
      id, profile->IsOffTheRecord(),
      profile->GetPath(),
      context));
#endif

  bool is_incognito_process = profile->IsOffTheRecord();

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

  chrome::mojom::RendererConfigurationAssociatedPtr rc_interface;
  host->GetChannel()->GetRemoteAssociatedInterface(&rc_interface);
  rc_interface->SetInitialConfiguration(is_incognito_process);

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

  RendererContentSettingRules rules;
  if (host->IsForGuestsOnly()) {
#if BUILDFLAG(ENABLE_EXTENSIONS)
    GetGuestViewDefaultContentSettingRules(is_incognito_process, &rules);
#else
    NOTREACHED();
#endif
  } else {
    GetRendererContentSettingRules(
        HostContentSettingsMapFactory::GetForProfile(profile), &rules);
  }
  rc_interface->SetContentSettingRules(rules);

  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()->StartService(
      service_manager::Identity(chrome::mojom::kRendererServiceName,
                                renderer_identity.user_id(),
                                renderer_identity.instance()),
      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::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)
  // Disable origin lock if this is an extension/app that applies effective URL
  // mappings.
  if (!ChromeContentBrowserClientExtensionsPart::ShouldLockToOrigin(
          browser_context, effective_site_url)) {
    return false;
  }
#endif
  return true;
}

const char*
ChromeContentBrowserClient::GetInitatorSchemeBypassingDocumentBlocking() {
#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
}

// 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::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::
    ShouldFrameShareParentSiteInstanceDespiteTopDocumentIsolation(
        const GURL& url,
        content::SiteInstance* parent_site_instance) {
  if (IsNTPSiteInstance(parent_site_instance))
    return true;

#if BUILDFLAG(ENABLE_EXTENSIONS)
  return ChromeContentBrowserClientExtensionsPart::
      ShouldFrameShareParentSiteInstanceDespiteTopDocumentIsolation(
          url, parent_site_instance);
#else
  return false;
#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
}

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::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)
  if (base::FeatureList::IsEnabled(features::kSignInProcessIsolation))
    isolated_origin_list.emplace_back(
        url::Origin::Create(GaiaUrls::GetInstance()->gaia_url()));
#endif

  return isolated_origin_list;
}

bool ChromeContentBrowserClient::ShouldEnableStrictSiteIsolation() {
  if (base::FeatureList::IsEnabled(
          features::kSitePerProcessOnlyForHighMemoryClients)) {
    constexpr int kDefaultMemoryThresholdMb = 1024;
    int memory_threshold_mb = base::GetFieldTrialParamByFeatureAsInt(
        features::kSitePerProcessOnlyForHighMemoryClients,
        features::kSitePerProcessOnlyForHighMemoryClientsParamName,
        kDefaultMemoryThresholdMb);
    if (base::SysInfo::AmountOfPhysicalMemoryMB() <= memory_threshold_mb)
      return false;
  }

  return base::FeatureList::IsEnabled(features::kSitePerProcess);
}

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",

      // Keys: cssExternalScannerNoPreload
      //       cssExternalScannerPreload
      "CSSExternalScanner",
  };

  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)
  bool enable_crash_reporter = breakpad::IsCrashReporterEnabled();
#if defined(OS_CHROMEOS)
  // Chrome OS uses the OS-level crash_reporter for mash services, so disable
  // breakpad in-process crashing dumping.
  if (command_line->HasSwitch(switches::kMashServiceName))
    enable_crash_reporter = false;
#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;
  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

#if BUILDFLAG(ENABLE_WEBRTC)
    MaybeCopyDisableWebRtcEncryptionSwitch(command_line,
                                           browser_command_line,
                                           chrome::GetChannel());
#endif

    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 (base::ListValue::const_iterator 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::kDisablePasswordGeneration,
      autofill::switches::kEnablePasswordGeneration,
      autofill::switches::kEnableSingleClickAutofill,
      autofill::switches::kEnableSuggestionsWithSubstringMatch,
      autofill::switches::kIgnoreAutocompleteOffForAutofill,
      autofill::switches::kLocalHeuristicsOnlyForPasswordGeneration,
      autofill::switches::kShowAutofillSignatures,
#if BUILDFLAG(ENABLE_EXTENSIONS)
      extensions::switches::kAllowHTTPBackgroundPage,
      extensions::switches::kAllowLegacyExtensionManifests,
      extensions::switches::kEnableEmbeddedExtensionOptions,
      extensions::switches::kEnableExperimentalExtensionApis,
      extensions::switches::kExtensionsOnChromeURLs,
      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::kProfilingAtStart,
      switches::kProfilingFile,
      switches::kProfilingFlush,
      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 == 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 BUILDFLAG(ENABLE_MUS)
  bool copy_switches = false;
  if (identity.name() == ui::mojom::kServiceName) {
    command_line->AppendSwitch(switches::kMessageLoopTypeUi);
    copy_switches = true;
  }
#if defined(OS_CHROMEOS)
  if (identity.name() == ash::mojom::kServiceName) {
    command_line->AppendSwitch(switches::kMessageLoopTypeUi);
    copy_switches = true;
  }
  if (mash_service_registry::IsMashServiceName(identity.name())) {
    command_line->AppendSwitchASCII(
        switches::kMashServiceName,
        mash_service_registry::GetMashServiceLabel(identity.name()));
  }
#endif
  // TODO(sky): move to a whitelist, but currently the set of flags is rather
  // sprawling.
  if (copy_switches) {
    for (const auto& sw : base::CommandLine::ForCurrentProcess()->GetSwitches())
      command_line->AppendSwitchNative(sw.first, sw.second);
  }
#endif  // BUILDFLAG(ENABLE_MUS)
}

std::string ChromeContentBrowserClient::GetApplicationLocale() {
  if (BrowserThread::CurrentlyOn(BrowserThread::IO))
    return g_io_thread_application_locale.Get();
  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::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);
  *extra_headers =
      client_hints::GetAdditionalNavigationRequestClientHintsHeaders(
          web_contents->GetBrowserContext(), url);
  prerender::PrerenderContents* prerender_contents =
      prerender::PrerenderContents::FromWebContents(web_contents);
  if (prerender_contents) {
    if (prerender_contents->prerender_mode() == prerender::PREFETCH_ONLY)
      *extra_load_flags = net::LOAD_PREFETCH;
  }
}

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,
    const base::Callback<content::WebContents*(void)>& 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()) {
    BrowserThread::PostTask(
        BrowserThread::UI, FROM_HERE,
        base::BindOnce(&TabSpecificContentSettings::ServiceWorkerAccessed,
                       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);

  base::Callback<content::WebContents*(void)> wc_getter =
      base::Bind(&GetWebContents, render_process_id, render_frame_id);
  BrowserThread::PostTask(
      BrowserThread::UI, FROM_HERE,
      base::BindOnce(&TabSpecificContentSettings::CookiesRead, wc_getter, 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,
    const net::CookieOptions& options) {
  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);

  base::Callback<content::WebContents*(void)> wc_getter =
      base::Bind(&GetWebContents, render_process_id, render_frame_id);
  BrowserThread::PostTask(
      BrowserThread::UI, FROM_HERE,
      base::BindOnce(&TabSpecificContentSettings::CookieChanged, wc_getter, url,
                     first_party, cookie, options, !allow));
  return allow;
}

void ChromeContentBrowserClient::AllowWorkerFileSystem(
    const GURL& url,
    content::ResourceContext* context,
    const std::vector<std::pair<int, int> >& 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<std::pair<int, int> >& render_frames,
    base::Callback<void(bool)> callback,
    bool allow) {
  DCHECK_CURRENTLY_ON(BrowserThread::IO);
  std::vector<std::pair<int, int> >::const_iterator i;
  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 (i = render_frames.begin(); i != render_frames.end(); ++i) {
    if (process_map.find(i->first) != process_map.end())
      continue;

    process_map.insert(std::pair<int, int>(i->first, i->second));

    if (extensions::WebViewRendererState::GetInstance()->IsGuest(i->first))
      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();
  BrowserThread::PostTask(
      BrowserThread::UI, FROM_HERE,
      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<std::pair<int, int> >& render_frames,
    base::Callback<void(bool)> callback,
    bool allow) {
  // Record access to file system for potential display in UI.
  std::vector<std::pair<int, int> >::const_iterator i;
  for (i = render_frames.begin(); i != render_frames.end(); ++i) {
    BrowserThread::PostTask(
        BrowserThread::UI, FROM_HERE,
        base::BindOnce(&TabSpecificContentSettings::FileSystemAccessed,
                       i->first, i->second, url, !allow));
  }
  callback.Run(allow);
}

bool ChromeContentBrowserClient::AllowWorkerIndexedDB(
    const GURL& url,
    const base::string16& name,
    content::ResourceContext* context,
    const std::vector<std::pair<int, int> >& 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.
  std::vector<std::pair<int, int> >::const_iterator i;
  for (i = render_frames.begin(); i != render_frames.end(); ++i) {
    BrowserThread::PostTask(
        BrowserThread::UI, FROM_HERE,
        base::BindOnce(&TabSpecificContentSettings::IndexedDBAccessed, i->first,
                       i->second, url, name, !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::URLRequestContext*
ChromeContentBrowserClient::OverrideRequestContextForURL(
    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->extensions_request_context();
  }
#endif

  return NULL;
}

void ChromeContentBrowserClient::GetGeolocationRequestContext(
    base::OnceCallback<void(scoped_refptr<net::URLRequestContextGetter>)>
        callback) {
  BrowserThread::PostTaskAndReplyWithResult(
      BrowserThread::UI, FROM_HERE,
      base::BindOnce(&GetSystemRequestContextOnUIThread), std::move(callback));
}

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

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));
}

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::CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kCommittedInterstitials)) {
    // 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());
}

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<base::Value> filter =
      HostContentSettingsMapFactory::GetForProfile(profile)->GetWebsiteSetting(
          requesting_url, requesting_url,
          CONTENT_SETTINGS_TYPE_AUTO_SELECT_CERTIFICATE, std::string(), NULL);

  if (filter.get()) {
    // Try to automatically select a client certificate.
    if (filter->is_dict()) {
      base::DictionaryValue* filter_dict =
          static_cast<base::DictionaryValue*>(filter.get());

      for (size_t i = 0; i < client_certs.size(); ++i) {
        if (CertMatchesFilter(*client_certs[i]->certificate(), *filter_dict)) {
          // Use the first certificate that is matched by the filter.
          // The callback will own |client_certs[i]| and |delegate|, keeping
          // them alive until after ContinueWithCertificate is called.
          scoped_refptr<net::X509Certificate> cert =
              client_certs[i]->certificate();
          net::ClientCertIdentity::SelfOwningAcquirePrivateKey(
              std::move(client_certs[i]),
              base::Bind(
                  &content::ClientCertificateDelegate::ContinueWithCertificate,
                  base::Passed(&delegate), std::move(cert)));
          return;
        }
      }
    } else {
      NOTREACHED();
    }
  }

  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 (PopupBlockerTabHelper::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();
}

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);

  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();
      }

      if (base::FeatureList::IsEnabled(media::kUseSurfaceLayerForVideo) &&
          base::FeatureList::IsEnabled(media::kPictureInPicture)) {
        web_prefs->picture_in_picture_enabled =
            tab_android->IsPictureInPictureEnabled();
      }
    }
#endif  // defined(OS_ANDROID)
    web_prefs->immersive_mode_enabled = vr::VrTabHelper::IsInVr(contents);
  }

#if defined(OS_ANDROID)
  web_prefs->video_fullscreen_detection_enabled =
      chrome::android::AppHooks::ShouldDetectVideoFullscreen();

  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();
    }
  }

#if !defined(OS_ANDROID)
  // If autoplay is allowed by policy then update the autoplay policy in web
  // preferences.
  if (IsAutoplayAllowedByPolicy(contents, prefs)) {
    web_prefs->autoplay_policy =
        content::AutoplayPolicy::kNoUserGestureRequired;
  }
#endif  // !defined(OS_ANDROID)

  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);
}

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

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>(),
      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);
  }

  breakpad::CrashDumpObserver::GetInstance()->BrowserChildProcessStarted(
      child_process_id, mappings);

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

#if defined(OS_WIN)
base::string16 ChromeContentBrowserClient::GetAppContainerSidForSandboxType(
    int sandbox_type) const {
  base::string16 sid;

#if defined(GOOGLE_CHROME_BUILD)
  const version_info::Channel channel = chrome::GetChannel();

  // It's possible to have a SxS installation running at the same time as a
  // non-SxS so isolate them from each other.
  if (channel == version_info::Channel::CANARY) {
    sid.assign(
        L"S-1-15-2-3251537155-1984446955-2931258699-841473695-1938553385-"
        L"924012150-");
  } else {
    sid.assign(
        L"S-1-15-2-3251537155-1984446955-2931258699-841473695-1938553385-"
        L"924012149-");
  }
#else
  sid.assign(
      L"S-1-15-2-3251537155-1984446955-2931258699-841473695-1938553385-"
      L"924012148-");
#endif

  // TODO(wfh): Add support for more process types here. crbug.com/499523
  switch (sandbox_type) {
    case service_manager::SANDBOX_TYPE_RENDERER:
      return sid + 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 sid + 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 =
      content::BrowserThread::GetTaskRunnerForThread(
          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,
                          metrics::CallStackProfileParams::RENDERER_PROCESS));

  if (NetBenchmarking::CheckBenchmarkingEnabled()) {
    Profile* profile =
        Profile::FromBrowserContext(render_process_host->GetBrowserContext());
    net::URLRequestContextGetter* context =
        render_process_host->GetStoragePartition()->GetURLRequestContext();
    registry->AddInterface(base::Bind(&NetBenchmarking::Create, profile,
                                      base::RetainedRef(context)));
  }

#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)),
        BrowserThread::GetTaskRunnerForThread(BrowserThread::IO));
  }
#endif  // defined(SAFE_BROWSING_DB_LOCAL) || defined(SAFE_BROWSING_DB_REMOTE)

#if defined(OS_WIN)
  if (base::FeatureList::IsEnabled(features::kModuleDatabase)) {
    // 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 it to be retrieved 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::ProcessHandle {
          return host->GetProcess().Handle();
        },
        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

  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);
  }
}

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::RegisterInProcessServices(
    StaticServiceMap* services) {
  {
    service_manager::EmbeddedServiceInfo info;
    info.factory = ChromeService::GetInstance()->CreateChromeServiceFactory();
    services->insert(std::make_pair(chrome::mojom::kServiceName, info));
  }
  if (g_browser_process->pref_service_factory()) {
    service_manager::EmbeddedServiceInfo info;
    info.factory =
        g_browser_process->pref_service_factory()->CreatePrefServiceFactory();
    info.task_runner = base::ThreadTaskRunnerHandle::Get();
    services->insert(
        std::make_pair(prefs::mojom::kLocalStateServiceName, info));
  }
  service_manager::EmbeddedServiceInfo info;
#if BUILDFLAG(ENABLE_MOJO_MEDIA_IN_BROWSER_PROCESS)
  {
    service_manager::EmbeddedServiceInfo info;
    info.factory = base::Bind(&media::CreateMediaService);
    services->insert(std::make_pair(media::mojom::kMediaServiceName, info));
  }
#endif

#if defined(OS_ANDROID)
  {
    service_manager::EmbeddedServiceInfo info;
    info.factory =
        base::Bind(&proxy_resolver::ProxyResolverService::CreateService);
    services->insert(
        std::make_pair(proxy_resolver::mojom::kProxyResolverServiceName, info));
  }
#endif
  g_browser_process->platform_part()->RegisterInProcessServices(services);
}

void ChromeContentBrowserClient::RegisterOutOfProcessServices(
    OutOfProcessServiceMap* services) {
#if BUILDFLAG(ENABLE_PRINTING)
  (*services)[printing::mojom::kServiceName] =
      base::ASCIIToUTF16("PDF Compositor Service");
#endif

#if BUILDFLAG(ENABLE_PRINT_PREVIEW)
  (*services)[printing::mojom::kChromePrintingServiceName] =
      l10n_util::GetStringUTF16(IDS_UTILITY_PROCESS_PRINTING_SERVICE_NAME);
#endif

  (*services)[heap_profiling::mojom::kServiceName] =
      base::ASCIIToUTF16("Profiling Service");

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

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

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

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

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

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

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

  (*services)[patch::mojom::kServiceName] =
      l10n_util::GetStringUTF16(IDS_UTILITY_PROCESS_PATCH_NAME);

  (*services)[unzip::mojom::kServiceName] =
      l10n_util::GetStringUTF16(IDS_UTILITY_PROCESS_UNZIP_NAME);

#if defined(OS_CHROMEOS)
  if (base::FeatureList::IsEnabled(features::kMash))
    mash_service_registry::RegisterOutOfProcessServices(services);
#endif
}

bool ChromeContentBrowserClient::ShouldTerminateOnServiceQuit(
    const service_manager::Identity& id) {
#if defined(OS_CHROMEOS)
  return mash_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},
  });
}

void ChromeContentBrowserClient::OpenURL(
    content::BrowserContext* browser_context,
    const content::OpenURLParams& params,
    const base::Callback<void(content::WebContents*)>& callback) {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);

#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 {
      auto bookmark_app_throttle =
          extensions::BookmarkAppNavigationThrottle::MaybeCreateThrottleFor(
              handle);
      if (bookmark_app_throttle)
        throttles.push_back(std::move(bookmark_app_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));
#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::CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kCommittedInterstitials)) {
    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

  return throttles;
}

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

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,
    blink::mojom::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 = blink::mojom::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::Bind(&autofill::ContentAutofillDriverFactory::BindAutofillDriver));

  frame_interfaces_parameterized_->AddInterface(
      base::Bind(&password_manager::ContentPasswordManagerDriverFactory::
                     BindPasswordManagerDriver));
  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<webauth::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

  frame_interfaces_parameterized_->AddInterface(
      base::Bind(&CreateBudgetService));

  worker_interfaces_parameterized_->AddInterface(
      base::Bind(&BudgetServiceImpl::Create));
}

#if BUILDFLAG(ENABLE_WEBRTC)
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));
  }
}
#endif  // BUILDFLAG(ENABLE_WEBRTC)

std::unique_ptr<content::MemoryCoordinatorDelegate>
ChromeContentBrowserClient::GetMemoryCoordinatorDelegate() {
  return memory::ChromeMemoryCoordinatorDelegate::Create();
}

#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;

#if defined(SAFE_BROWSING_DB_LOCAL) || defined(SAFE_BROWSING_DB_REMOTE)
  // Null-check safe_browsing_service_ as in unit tests |resource_context| is a
  // MockResourceContext and the cast doesn't work.
  if (safe_browsing_service_) {
    ProfileIOData* io_data =
        ProfileIOData::FromResourceContext(resource_context);
    bool matches_enterprise_whitelist =
        io_data && 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),
          BrowserThread::GetTaskRunnerForThread(BrowserThread::UI)));
    }
  }

#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
  return result;
}

void ChromeContentBrowserClient::RegisterNonNetworkNavigationURLLoaderFactories(
    int render_process_id,
    int render_frame_id,
    NonNetworkURLLoaderFactoryMap* factories) {
#if BUILDFLAG(ENABLE_EXTENSIONS)
  content::RenderProcessHost* process_host =
      content::RenderProcessHost::FromID(render_process_id);
  content::BrowserContext* browser_context = process_host->GetBrowserContext();
  factories->emplace(
      extensions::kExtensionScheme,
      extensions::CreateExtensionNavigationURLLoaderFactory(
          render_process_id, render_frame_id,
          extensions::ExtensionSystem::Get(browser_context)->info_map()));
#endif
}

void ChromeContentBrowserClient::
    RegisterNonNetworkSubresourceURLLoaderFactories(
        content::RenderFrameHost* frame_host,
        const GURL& frame_url,
        NonNetworkURLLoaderFactoryMap* factories) {
#if BUILDFLAG(ENABLE_EXTENSIONS)
  content::RenderProcessHost* process_host = frame_host->GetProcess();
  content::BrowserContext* browser_context = process_host->GetBrowserContext();
  auto factory = extensions::MaybeCreateExtensionSubresourceURLLoaderFactory(
      process_host->GetID(), frame_host->GetRoutingID(), frame_url,
      extensions::ExtensionSystem::Get(browser_context)->info_map());
  if (factory)
    factories->emplace(extensions::kExtensionScheme, std::move(factory));

  // This logic should match
  // ChromeExtensionWebContentsObserver::RenderFrameCreated.
  WebContents* web_contents = WebContents::FromRenderFrameHost(frame_host);
  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(frame_host->GetProcess()->GetID())) {
    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;

  // 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.
    base::flat_set<std::string> allowed_webui_hosts = {
        content::kChromeUIResourcesHost, chrome::kChromeUIThemeHost};
    factories->emplace(
        content::kChromeUIScheme,
        content::CreateWebUIURLLoader(frame_host, content::kChromeUIScheme,
                                      std::move(allowed_webui_hosts)));
  } else 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).
    base::flat_set<std::string> allowed_webui_hosts = {
        chrome::kChromeUIExtensionIconHost, chrome::kChromeUIFaviconHost};
    factories->emplace(
        content::kChromeUIScheme,
        content::CreateWebUIURLLoader(frame_host, content::kChromeUIScheme,
                                      std::move(allowed_webui_hosts)));
  }
#endif  // BUILDFLAG(ENABLE_EXTENSIONS)
}

bool ChromeContentBrowserClient::WillCreateURLLoaderFactory(
    content::RenderFrameHost* frame,
    bool is_navigation,
    network::mojom::URLLoaderFactoryRequest* factory_request) {
#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 false;

  return web_request_api->MaybeProxyURLLoaderFactory(frame, is_navigation,
                                                     factory_request);
#else
  return false;
#endif
}

network::mojom::NetworkContextPtr
ChromeContentBrowserClient::CreateNetworkContext(
    content::BrowserContext* context,
    bool in_memory,
    const base::FilePath& relative_partition_path) {
  Profile* profile = Profile::FromBrowserContext(context);
  // If the relative partition path is empty, this is creating the Profile's
  // main NetworkContext.
  if (relative_partition_path.empty()) {
    // TODO(mmenke): Look into calling ProfileNetworkContextServiceFactory, once
    // ProfileIOData is removed. Currently, TestProfile (used in unit tests)
    // needs to be able to bypass ProfileNetworkContextServiceFactory, since
    // TestProfile bypasses ProfileIOData's URLRequestContext creation logic.
    return profile->CreateMainNetworkContext();
  }

  // TODO(mmenke):  Share this with the non-network service code path once
  // ProfileNetworkContextServiceFactory can create a fully functional
  // NetworkContext for Apps when the network service is disabled.
  if (base::FeatureList::IsEnabled(network::features::kNetworkService)) {
    return ProfileNetworkContextServiceFactory::GetForContext(context)
        ->CreateNetworkContextForPartition(in_memory, relative_partition_path);
  }

  return ContentBrowserClient::CreateNetworkContext(context, 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::CreateUsbDeviceManager(
    content::RenderFrameHost* render_frame_host,
    device::mojom::UsbDeviceManagerRequest 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->CreateDeviceManager(render_frame_host, std::move(request));
}

void ChromeContentBrowserClient::CreateUsbChooserService(
    content::RenderFrameHost* render_frame_host,
    device::mojom::UsbChooserServiceRequest 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->CreateChooserService(render_frame_host, std::move(request));
}

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,
    bool is_main_frame,
    const GURL& url,
    bool first_auth_attempt,
    const base::Callback<void(const base::Optional<net::AuthCredentials>&)>&
        auth_required_callback) {
  return CreateLoginPrompt(auth_info, web_contents_getter, is_main_frame, url,
                           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) {
#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)

  BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
                          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
}

// 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
}

bool ChromeContentBrowserClient::
    ShouldPermitIndividualAttestationForWebauthnRPID(
        content::BrowserContext* browser_context,
        const std::string& rp_id) {
  // If the RP ID is listed in the policy, signal that individual attestation is
  // permitted.
  return IsWebauthnRPIDListedInEnterprisePolicy(browser_context, rp_id);
}

void ChromeContentBrowserClient::ShouldReturnAttestationForWebauthnRPID(
    content::RenderFrameHost* rfh,
    const std::string& rp_id,
    const url::Origin& origin,
    base::OnceCallback<void(bool)> callback) {
#if defined(OS_ANDROID)
  // Android is expected to use platform APIs for webauthn which will take care
  // of prompting.
  std::move(callback).Run(true);
#else
  WebContents* web_contents = WebContents::FromRenderFrameHost(rfh);
  content::BrowserContext* browser_context = web_contents->GetBrowserContext();

  if (IsWebauthnRPIDListedInEnterprisePolicy(browser_context, rp_id)) {
    std::move(callback).Run(true);
    return;
  }

  // This does not use content::PermissionManager because that only works with
  // content settings, while this permission is a non-persisted, per-attested-
  // registration consent.
  PermissionRequestManager* permission_request_manager =
      PermissionRequestManager::FromWebContents(web_contents);
  if (!permission_request_manager) {
    std::move(callback).Run(false);
    return;
  }

  // The created AttestationPermissionRequest deletes itself once complete.
  permission_request_manager->AddRequest(
      NewAttestationPermissionRequest(origin, std::move(callback)));
#endif
}

bool ChromeContentBrowserClient::IsFocused(content::WebContents* web_contents) {
#if defined(OS_ANDROID)
  // Android is expected to use platform APIs for webauthn.
  return true;
#else
  for (const auto* browser : *BrowserList::GetInstance()) {
    const int tab_index =
        browser->tab_strip_model()->GetIndexOfWebContents(web_contents);
    if (tab_index != TabStripModel::kNoTab &&
        browser->tab_strip_model()->active_index() == tab_index) {
      return browser->window()->IsActive();
    }
  }

  return false;
#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();
}