content/browser/renderer_host/render_widget_host_view_android.cc

// 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 "content/browser/renderer_host/render_widget_host_view_android.h"

#include <android/bitmap.h>

#include <utility>

#include "base/android/application_status_listener.h"
#include "base/android/build_info.h"
#include "base/bind.h"
#include "base/callback_helpers.h"
#include "base/command_line.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/memory/ptr_util.h"
#include "base/memory/ref_counted.h"
#include "base/metrics/histogram_macros.h"
#include "base/single_thread_task_runner.h"
#include "base/strings/utf_string_conversions.h"
#include "base/sys_info.h"
#include "base/threading/thread_task_runner_handle.h"
#include "cc/layers/layer.h"
#include "cc/layers/surface_layer.h"
#include "cc/output/compositor_frame.h"
#include "cc/output/latency_info_swap_promise.h"
#include "cc/trees/layer_tree_host.h"
#include "components/viz/common/gl_helper.h"
#include "components/viz/common/quads/copy_output_request.h"
#include "components/viz/common/quads/copy_output_result.h"
#include "components/viz/common/quads/single_release_callback.h"
#include "components/viz/service/frame_sinks/frame_sink_manager_impl.h"
#include "components/viz/service/surfaces/surface.h"
#include "components/viz/service/surfaces/surface_hittest.h"
#include "content/browser/accessibility/browser_accessibility_manager_android.h"
#include "content/browser/accessibility/web_contents_accessibility_android.h"
#include "content/browser/android/composited_touch_handle_drawable.h"
#include "content/browser/android/content_view_core.h"
#include "content/browser/android/ime_adapter_android.h"
#include "content/browser/android/overscroll_controller_android.h"
#include "content/browser/android/popup_zoomer.h"
#include "content/browser/android/selection_popup_controller.h"
#include "content/browser/android/synchronous_compositor_host.h"
#include "content/browser/android/text_suggestion_host_android.h"
#include "content/browser/compositor/surface_utils.h"
#include "content/browser/devtools/render_frame_devtools_agent_host.h"
#include "content/browser/gpu/browser_gpu_channel_host_factory.h"
#include "content/browser/gpu/compositor_util.h"
#include "content/browser/gpu/gpu_process_host.h"
#include "content/browser/media/android/media_web_contents_observer_android.h"
#include "content/browser/renderer_host/compositor_impl_android.h"
#include "content/browser/renderer_host/dip_util.h"
#include "content/browser/renderer_host/frame_metadata_util.h"
#include "content/browser/renderer_host/input/input_router.h"
#include "content/browser/renderer_host/input/synthetic_gesture_target_android.h"
#include "content/browser/renderer_host/input/touch_selection_controller_client_manager_android.h"
#include "content/browser/renderer_host/input/web_input_event_builders_android.h"
#include "content/browser/renderer_host/render_process_host_impl.h"
#include "content/browser/renderer_host/render_view_host_delegate_view.h"
#include "content/browser/renderer_host/render_view_host_impl.h"
#include "content/browser/renderer_host/render_widget_host_impl.h"
#include "content/browser/renderer_host/render_widget_host_input_event_router.h"
#include "content/browser/renderer_host/ui_events_helper.h"
#include "content/common/gpu_stream_constants.h"
#include "content/common/input_messages.h"
#include "content/common/site_isolation_policy.h"
#include "content/common/view_messages.h"
#include "content/public/browser/android/compositor.h"
#include "content/public/browser/android/synchronous_compositor_client.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/devtools_agent_host.h"
#include "content/public/browser/render_view_host.h"
#include "content/public/browser/render_widget_host_iterator.h"
#include "content/public/common/content_features.h"
#include "content/public/common/content_switches.h"
#include "gpu/command_buffer/client/gles2_implementation.h"
#include "gpu/command_buffer/client/gles2_interface.h"
#include "ipc/ipc_message_macros.h"
#include "ipc/ipc_message_start.h"
#include "skia/ext/image_operations.h"
#include "third_party/khronos/GLES2/gl2.h"
#include "third_party/khronos/GLES2/gl2ext.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "ui/android/view_android_observer.h"
#include "ui/android/window_android.h"
#include "ui/android/window_android_compositor.h"
#include "ui/base/layout.h"
#include "ui/base/ui_base_types.h"
#include "ui/events/android/motion_event_android.h"
#include "ui/events/base_event_utils.h"
#include "ui/events/blink/blink_event_util.h"
#include "ui/events/blink/did_overscroll_params.h"
#include "ui/events/blink/web_input_event_traits.h"
#include "ui/events/gesture_detection/gesture_provider_config_helper.h"
#include "ui/gfx/android/java_bitmap.h"
#include "ui/gfx/android/view_configuration.h"
#include "ui/gfx/geometry/dip_util.h"
#include "ui/gfx/geometry/size_conversions.h"
#include "ui/touch_selection/touch_selection_controller.h"

namespace content {

namespace {

static const char kAsyncReadBackString[] = "Compositing.CopyFromSurfaceTime";
static const base::TimeDelta kClickCountInterval =
    base::TimeDelta::FromSecondsD(0.5);
static const float kClickCountRadiusSquaredDIP = 25;

class PendingReadbackLock;

PendingReadbackLock* g_pending_readback_lock = nullptr;

class PendingReadbackLock : public base::RefCounted<PendingReadbackLock> {
 public:
  PendingReadbackLock() {
    DCHECK_EQ(g_pending_readback_lock, nullptr);
    g_pending_readback_lock = this;
  }

 private:
  friend class base::RefCounted<PendingReadbackLock>;

  ~PendingReadbackLock() {
    DCHECK_EQ(g_pending_readback_lock, this);
    g_pending_readback_lock = nullptr;
  }
};

using base::android::ApplicationState;
using base::android::ApplicationStatusListener;

class GLHelperHolder {
 public:
  static GLHelperHolder* Create();

  viz::GLHelper* gl_helper() { return gl_helper_.get(); }
  bool IsLost() {
    if (!gl_helper_)
      return true;
    return provider_->ContextGL()->GetGraphicsResetStatusKHR() != GL_NO_ERROR;
  }

  void ReleaseIfPossible();

 private:
  GLHelperHolder();
  void Initialize();
  void OnContextLost();
  void OnApplicationStatusChanged(ApplicationState new_state);

  scoped_refptr<ui::ContextProviderCommandBuffer> provider_;
  std::unique_ptr<viz::GLHelper> gl_helper_;

  // Set to |false| if there are only stopped activities (or none).
  bool has_running_or_paused_activities_;

  std::unique_ptr<ApplicationStatusListener> app_status_listener_;

  DISALLOW_COPY_AND_ASSIGN(GLHelperHolder);
};

GLHelperHolder::GLHelperHolder()
    : has_running_or_paused_activities_(
          (ApplicationStatusListener::GetState() ==
           base::android::APPLICATION_STATE_HAS_RUNNING_ACTIVITIES) ||
          (ApplicationStatusListener::GetState() ==
           base::android::APPLICATION_STATE_HAS_PAUSED_ACTIVITIES)) {}

GLHelperHolder* GLHelperHolder::Create() {
  GLHelperHolder* holder = new GLHelperHolder;
  holder->Initialize();
  return holder;
}

void GLHelperHolder::Initialize() {
  auto* factory = BrowserGpuChannelHostFactory::instance();
  scoped_refptr<gpu::GpuChannelHost> gpu_channel_host(factory->GetGpuChannel());

  // The Browser Compositor is in charge of reestablishing the channel if its
  // missing.
  if (!gpu_channel_host)
    return;

  int32_t stream_id = kGpuStreamIdDefault;
  gpu::SchedulingPriority stream_priority = kGpuStreamPriorityUI;

  // This is for an offscreen context, so we don't need the default framebuffer
  // to have alpha, stencil, depth, antialiasing.
  gpu::gles2::ContextCreationAttribHelper attributes;
  attributes.alpha_size = -1;
  attributes.stencil_size = 0;
  attributes.depth_size = 0;
  attributes.samples = 0;
  attributes.sample_buffers = 0;
  attributes.bind_generates_resource = false;

  gpu::SharedMemoryLimits limits;
  // The GLHelper context doesn't do a lot of stuff, so we don't expect it to
  // need a lot of space for commands.
  limits.command_buffer_size = 1024;
  // The transfer buffer is used for shaders among other things, so give some
  // reasonable but small limit.
  limits.start_transfer_buffer_size = 4 * 1024;
  limits.min_transfer_buffer_size = 4 * 1024;
  limits.max_transfer_buffer_size = 128 * 1024;
  // Very few allocations from mapped memory pool, so this can be really low.
  limits.mapped_memory_reclaim_limit = 4 * 1024;

  constexpr bool automatic_flushes = false;
  constexpr bool support_locking = false;
  const GURL url("chrome://gpu/RenderWidgetHostViewAndroid");

  provider_ = new ui::ContextProviderCommandBuffer(
      std::move(gpu_channel_host), stream_id, stream_priority,
      gpu::kNullSurfaceHandle, url, automatic_flushes, support_locking, limits,
      attributes, nullptr,
      ui::command_buffer_metrics::BROWSER_OFFSCREEN_MAINTHREAD_CONTEXT);
  if (!provider_->BindToCurrentThread())
    return;
  provider_->ContextGL()->TraceBeginCHROMIUM(
      "gpu_toplevel",
      base::StringPrintf("CmdBufferImageTransportFactory-%p", provider_.get())
          .c_str());
  provider_->SetLostContextCallback(
      base::Bind(&GLHelperHolder::OnContextLost, base::Unretained(this)));
  gl_helper_.reset(
      new viz::GLHelper(provider_->ContextGL(), provider_->ContextSupport()));

  // Unretained() is safe because |this| owns the following two callbacks.
  app_status_listener_.reset(new ApplicationStatusListener(base::Bind(
      &GLHelperHolder::OnApplicationStatusChanged, base::Unretained(this))));
}

void GLHelperHolder::ReleaseIfPossible() {
  if (!has_running_or_paused_activities_ && !g_pending_readback_lock) {
    gl_helper_.reset();
    provider_ = nullptr;
    // Make sure this will get recreated on next use.
    DCHECK(IsLost());
  }
}

void GLHelperHolder::OnContextLost() {
  app_status_listener_.reset();
  gl_helper_.reset();
  // Need to post a task because the command buffer client cannot be deleted
  // from within this callback.
  base::ThreadTaskRunnerHandle::Get()->PostTask(
      FROM_HERE, base::Bind(&RenderWidgetHostViewAndroid::OnContextLost));
}

void GLHelperHolder::OnApplicationStatusChanged(ApplicationState new_state) {
  has_running_or_paused_activities_ =
      new_state == base::android::APPLICATION_STATE_HAS_RUNNING_ACTIVITIES ||
      new_state == base::android::APPLICATION_STATE_HAS_PAUSED_ACTIVITIES;
  ReleaseIfPossible();
}

GLHelperHolder* GetPostReadbackGLHelperHolder(bool create_if_necessary) {
  static GLHelperHolder* g_readback_helper_holder = nullptr;

  if (!create_if_necessary && !g_readback_helper_holder)
    return nullptr;

  if (g_readback_helper_holder && g_readback_helper_holder->IsLost()) {
    delete g_readback_helper_holder;
    g_readback_helper_holder = nullptr;
  }

  if (!g_readback_helper_holder)
    g_readback_helper_holder = GLHelperHolder::Create();

  return g_readback_helper_holder;
}

viz::GLHelper* GetPostReadbackGLHelper() {
  bool create_if_necessary = true;
  return GetPostReadbackGLHelperHolder(create_if_necessary)->gl_helper();
}

void ReleaseGLHelper() {
  bool create_if_necessary = false;
  GLHelperHolder* holder = GetPostReadbackGLHelperHolder(create_if_necessary);

  if (holder) {
    holder->ReleaseIfPossible();
  }
}

void CopyFromCompositingSurfaceFinished(
    const ReadbackRequestCallback& callback,
    std::unique_ptr<viz::SingleReleaseCallback> release_callback,
    std::unique_ptr<SkBitmap> bitmap,
    const base::TimeTicks& start_time,
    scoped_refptr<PendingReadbackLock> readback_lock,
    bool result) {
  TRACE_EVENT0(
      "cc", "RenderWidgetHostViewAndroid::CopyFromCompositingSurfaceFinished");
  gpu::SyncToken sync_token;
  if (result) {
    viz::GLHelper* gl_helper = GetPostReadbackGLHelper();
    if (gl_helper)
      gl_helper->GenerateSyncToken(&sync_token);
  }

  // PostTask() to make sure the |readback_lock| is released. Also do this
  // synchronous GPU operation in a clean callstack.
  BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
                          base::Bind(&ReleaseGLHelper));

  const bool lost_resource = !sync_token.HasData();
  release_callback->Run(sync_token, lost_resource);
  UMA_HISTOGRAM_TIMES(kAsyncReadBackString,
                      base::TimeTicks::Now() - start_time);
  ReadbackResponse response = result ? READBACK_SUCCESS : READBACK_FAILED;
  callback.Run(*bitmap, response);
}

std::unique_ptr<ui::TouchSelectionController> CreateSelectionController(
    ui::TouchSelectionControllerClient* client,
    ContentViewCore* content_view_core) {
  DCHECK(client);
  DCHECK(content_view_core);
  ui::TouchSelectionController::Config config;
  config.max_tap_duration = base::TimeDelta::FromMilliseconds(
      gfx::ViewConfiguration::GetLongPressTimeoutInMs());
  config.tap_slop = gfx::ViewConfiguration::GetTouchSlopInDips();
  config.enable_adaptive_handle_orientation =
      base::CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kEnableAdaptiveSelectionHandleOrientation);
  config.enable_longpress_drag_selection =
      base::CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kEnableLongpressDragSelection);
  return base::MakeUnique<ui::TouchSelectionController>(client, config);
}

gfx::RectF GetSelectionRect(const ui::TouchSelectionController& controller) {
  gfx::RectF rect = controller.GetRectBetweenBounds();
  if (rect.IsEmpty())
    return rect;

  rect.Union(controller.GetStartHandleRect());
  rect.Union(controller.GetEndHandleRect());
  return rect;
}

// TODO(wjmaclean): There is significant overlap between
// PrepareTextureCopyOutputResult and CopyFromCompositingSurfaceFinished in
// this file, and the versions in surface_utils.cc. They should
// be merged. See https://crbug.com/582955
void PrepareTextureCopyOutputResult(
    const gfx::Size& dst_size_in_pixel,
    SkColorType color_type,
    const base::TimeTicks& start_time,
    const ReadbackRequestCallback& callback,
    scoped_refptr<PendingReadbackLock> readback_lock,
    std::unique_ptr<viz::CopyOutputResult> result) {
  base::ScopedClosureRunner scoped_callback_runner(
      base::Bind(callback, SkBitmap(), READBACK_FAILED));
  TRACE_EVENT0("cc",
               "RenderWidgetHostViewAndroid::PrepareTextureCopyOutputResult");
  if (result->IsEmpty())
    return;

  viz::TextureMailbox texture_mailbox;
  std::unique_ptr<viz::SingleReleaseCallback> release_callback;
  if (auto* mailbox = result->GetTextureMailbox()) {
    texture_mailbox = *mailbox;
    release_callback = result->TakeTextureOwnership();
  }
  if (!texture_mailbox.IsTexture())
    return;

  viz::GLHelper* gl_helper = GetPostReadbackGLHelper();
  if (!gl_helper)
    return;
  if (!gl_helper->IsReadbackConfigSupported(color_type))
    color_type = kRGBA_8888_SkColorType;

  gfx::Size output_size_in_pixel;
  if (dst_size_in_pixel.IsEmpty())
    output_size_in_pixel = result->size();
  else
    output_size_in_pixel = dst_size_in_pixel;

  std::unique_ptr<SkBitmap> bitmap(new SkBitmap);
  if (!bitmap->tryAllocPixels(SkImageInfo::Make(output_size_in_pixel.width(),
                                                output_size_in_pixel.height(),
                                                color_type,
                                                kOpaque_SkAlphaType))) {
    scoped_callback_runner.ReplaceClosure(
        base::Bind(callback, SkBitmap(), READBACK_BITMAP_ALLOCATION_FAILURE));
    return;
  }

  uint8_t* pixels = static_cast<uint8_t*>(bitmap->getPixels());

  ignore_result(scoped_callback_runner.Release());

  gl_helper->CropScaleReadbackAndCleanMailbox(
      texture_mailbox.mailbox(), texture_mailbox.sync_token(), result->size(),
      gfx::Rect(result->size()), output_size_in_pixel, pixels, color_type,
      base::Bind(&CopyFromCompositingSurfaceFinished, callback,
                 base::Passed(&release_callback), base::Passed(&bitmap),
                 start_time, readback_lock),
      viz::GLHelper::SCALER_QUALITY_GOOD);
}

void RecordToolTypeForActionDown(const ui::MotionEventAndroid& event) {
  ui::MotionEventAndroid::Action action = event.GetAction();
  if (action == ui::MotionEventAndroid::ACTION_DOWN ||
      action == ui::MotionEventAndroid::ACTION_POINTER_DOWN ||
      action == ui::MotionEventAndroid::ACTION_BUTTON_PRESS) {
    UMA_HISTOGRAM_ENUMERATION("Event.AndroidActionDown.ToolType",
                              event.GetToolType(0),
                              ui::MotionEventAndroid::TOOL_TYPE_LAST + 1);
  }
}

bool FloatEquals(float a, float b) {
  return std::abs(a - b) < FLT_EPSILON;
}

void WakeUpGpu(GpuProcessHost* host) {
  if (host && host->wake_up_gpu_before_drawing()) {
    host->gpu_service()->WakeUpGpu();
  }
}

}  // namespace

void RenderWidgetHostViewAndroid::OnContextLost() {
  std::unique_ptr<RenderWidgetHostIterator> widgets(
      RenderWidgetHostImpl::GetAllRenderWidgetHosts());
  while (RenderWidgetHost* widget = widgets->GetNextHost()) {
    if (widget->GetView()) {
      static_cast<RenderWidgetHostViewAndroid*>(widget->GetView())
          ->OnLostResources();
    }
  }
}

RenderWidgetHostViewAndroid::RenderWidgetHostViewAndroid(
    RenderWidgetHostImpl* widget_host,
    ContentViewCore* content_view_core)
    : host_(widget_host),
      begin_frame_source_(nullptr),
      outstanding_begin_frame_requests_(0),
      is_showing_(!widget_host->is_hidden()),
      is_window_visible_(true),
      is_window_activity_started_(true),
      is_in_vr_(false),
      content_view_core_(nullptr),
      ime_adapter_android_(nullptr),
      selection_popup_controller_(nullptr),
      text_suggestion_host_(nullptr),
      background_color_(SK_ColorWHITE),
      cached_background_color_(SK_ColorWHITE),
      view_(this),
      gesture_provider_(ui::GetGestureProviderConfig(
                            ui::GestureProviderConfigType::CURRENT_PLATFORM),
                        this),
      stylus_text_selector_(this),
      using_browser_compositor_(CompositorImpl::IsInitialized()),
      synchronous_compositor_client_(nullptr),
      frame_evictor_(new viz::FrameEvictor(this)),
      observing_root_window_(false),
      prev_top_shown_pix_(0.f),
      prev_bottom_shown_pix_(0.f),
      mouse_wheel_phase_handler_(widget_host, this),
      weak_ptr_factory_(this) {
  // Set the layer which will hold the content layer for this view. The content
  // layer is managed by the DelegatedFrameHost.
  view_.SetLayer(cc::Layer::Create());
  view_.SetLayout(ui::ViewAndroid::LayoutParams::MatchParent());

  if (using_browser_compositor_) {
    viz::FrameSinkId frame_sink_id =
        host_->AllocateFrameSinkId(false /* is_guest_view_hack */);
    delegated_frame_host_.reset(new ui::DelegatedFrameHostAndroid(
        &view_, CompositorImpl::GetHostFrameSinkManager(),
        CompositorImpl::GetFrameSinkManager(), this, frame_sink_id));

    // Let the page-level input event router know about our frame sink ID
    // for surface-based hit testing.
    if (host_->delegate() && host_->delegate()->GetInputEventRouter()) {
      host_->delegate()->GetInputEventRouter()->AddFrameSinkIdOwner(
          GetFrameSinkId(), this);
    }
  }

  host_->SetView(this);
  touch_selection_controller_client_manager_ =
      base::MakeUnique<TouchSelectionControllerClientManagerAndroid>(this);
  SetContentViewCore(content_view_core);

  CreateOverscrollControllerIfPossible();

  if (GetTextInputManager())
    GetTextInputManager()->AddObserver(this);
}

RenderWidgetHostViewAndroid::~RenderWidgetHostViewAndroid() {
  if (content_view_core_)
    content_view_core_->RemoveObserver(this);
  SetContentViewCore(NULL);
  DCHECK(!ime_adapter_android_);
  DCHECK(ack_callbacks_.empty());
  DCHECK(!delegated_frame_host_);
}

void RenderWidgetHostViewAndroid::AddDestructionObserver(
    DestructionObserver* observer) {
  destruction_observers_.AddObserver(observer);
}

void RenderWidgetHostViewAndroid::RemoveDestructionObserver(
    DestructionObserver* observer) {
  destruction_observers_.RemoveObserver(observer);
}

bool RenderWidgetHostViewAndroid::OnMessageReceived(
    const IPC::Message& message) {
  if (IPC_MESSAGE_ID_CLASS(message.type()) == SyncCompositorMsgStart) {
    return SyncCompositorOnMessageReceived(message);
  }
  bool handled = true;
  IPC_BEGIN_MESSAGE_MAP(RenderWidgetHostViewAndroid, message)
    IPC_MESSAGE_HANDLER(ViewHostMsg_ShowUnhandledTapUIIfNeeded,
                        OnShowUnhandledTapUIIfNeeded)
    IPC_MESSAGE_HANDLER(ViewHostMsg_SelectWordAroundCaretAck,
                        OnSelectWordAroundCaretAck)
    IPC_MESSAGE_UNHANDLED(handled = false)
  IPC_END_MESSAGE_MAP()
  return handled;
}

bool RenderWidgetHostViewAndroid::SyncCompositorOnMessageReceived(
    const IPC::Message& message) {
  DCHECK(!content_view_core_ || sync_compositor_) << !!content_view_core_;
  return sync_compositor_ && sync_compositor_->OnMessageReceived(message);
}

void RenderWidgetHostViewAndroid::InitAsChild(gfx::NativeView parent_view) {
  NOTIMPLEMENTED();
}

void RenderWidgetHostViewAndroid::InitAsPopup(
    RenderWidgetHostView* parent_host_view, const gfx::Rect& pos) {
  NOTIMPLEMENTED();
}

void RenderWidgetHostViewAndroid::InitAsFullscreen(
    RenderWidgetHostView* reference_host_view) {
  NOTIMPLEMENTED();
}

RenderWidgetHost*
RenderWidgetHostViewAndroid::GetRenderWidgetHost() const {
  return host_;
}

void RenderWidgetHostViewAndroid::WasResized() {
  host_->WasResized();
}

void RenderWidgetHostViewAndroid::SetSize(const gfx::Size& size) {
  // Ignore the given size as only the Java code has the power to
  // resize the view on Android.
  default_bounds_ = gfx::Rect(default_bounds_.origin(), size);
}

void RenderWidgetHostViewAndroid::SetBounds(const gfx::Rect& rect) {
  default_bounds_ = rect;
}

bool RenderWidgetHostViewAndroid::HasValidFrame() const {
  if (!content_view_core_)
    return false;

  if (current_surface_size_.IsEmpty())
    return false;
  // This tell us whether a valid frame has arrived or not.
  if (!frame_evictor_->HasFrame())
    return false;

  DCHECK(!delegated_frame_host_ ||
         delegated_frame_host_->HasDelegatedContent());
  return true;
}

gfx::Vector2dF RenderWidgetHostViewAndroid::GetLastScrollOffset() const {
  return last_scroll_offset_;
}

gfx::NativeView RenderWidgetHostViewAndroid::GetNativeView() const {
  return &view_;
}

gfx::NativeViewAccessible
RenderWidgetHostViewAndroid::GetNativeViewAccessible() {
  NOTIMPLEMENTED();
  return NULL;
}

void RenderWidgetHostViewAndroid::GotFocus() {
  host_->GotFocus();
  OnFocusInternal();
}

void RenderWidgetHostViewAndroid::LostFocus() {
  host_->LostFocus();
  LostFocusInternal();
}

void RenderWidgetHostViewAndroid::Focus() {
  if (view_.HasFocus())
    GotFocus();
  else
    view_.RequestFocus();
}

void RenderWidgetHostViewAndroid::OnFocusInternal() {
  if (overscroll_controller_)
    overscroll_controller_->Enable();
}

void RenderWidgetHostViewAndroid::LostFocusInternal() {
  if (overscroll_controller_)
    overscroll_controller_->Disable();
}

bool RenderWidgetHostViewAndroid::HasFocus() const {
  return view_.HasFocus();
}

bool RenderWidgetHostViewAndroid::IsSurfaceAvailableForCopy() const {
  return !using_browser_compositor_ || HasValidFrame();
}

void RenderWidgetHostViewAndroid::Show() {
  if (is_showing_)
    return;

  is_showing_ = true;
  ShowInternal();
}

void RenderWidgetHostViewAndroid::Hide() {
  if (!is_showing_)
    return;

  is_showing_ = false;
  HideInternal();
}

bool RenderWidgetHostViewAndroid::IsShowing() {
  // ContentViewCore represents the native side of the Java
  // ContentViewCore.  It being NULL means that it is not attached
  // to the View system yet, so we treat this RWHVA as hidden.
  return is_showing_ && content_view_core_;
}

void RenderWidgetHostViewAndroid::OnShowUnhandledTapUIIfNeeded(int x_dip,
                                                               int y_dip) {
  if (!selection_popup_controller_ || !content_view_core_)
    return;
  // Validate the coordinates are within the viewport.
  // TODO(jinsukkim): Get viewport size from ViewAndroid.
  gfx::Size viewport_size = content_view_core_->GetViewportSizeDip();
  if (x_dip < 0 || x_dip > viewport_size.width() ||
      y_dip < 0 || y_dip > viewport_size.height())
    return;
  selection_popup_controller_->OnShowUnhandledTapUIIfNeeded(
      x_dip, y_dip, view_.GetDipScale());
}

void RenderWidgetHostViewAndroid::OnSelectWordAroundCaretAck(bool did_select,
                                                             int start_adjust,
                                                             int end_adjust) {
  if (!selection_popup_controller_)
    return;
  selection_popup_controller_->OnSelectWordAroundCaretAck(
      did_select, start_adjust, end_adjust);
}

gfx::Rect RenderWidgetHostViewAndroid::GetViewBounds() const {
  if (!content_view_core_)
    return default_bounds_;

  gfx::Size size(content_view_core_->GetViewSize());
  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kEnableOSKOverscroll)) {
    size.Enlarge(0, view_.GetSystemWindowInsetBottom() / view_.GetDipScale());
  }

  return gfx::Rect(size);
}

gfx::Size RenderWidgetHostViewAndroid::GetVisibleViewportSize() const {
  if (!content_view_core_)
    return default_bounds_.size();

  return content_view_core_->GetViewSize();
}

gfx::Size RenderWidgetHostViewAndroid::GetPhysicalBackingSize() const {
  if (!content_view_core_) {
    if (default_bounds_.IsEmpty()) return gfx::Size();

    float scale_factor = view_.GetDipScale();
    return gfx::Size(default_bounds_.right() * scale_factor,
                     default_bounds_.bottom() * scale_factor);
  }

  return view_.GetPhysicalBackingSize();
}

bool RenderWidgetHostViewAndroid::DoBrowserControlsShrinkBlinkSize() const {
  // Whether or not Blink's viewport size should be shrunk by the height of the
  // URL-bar.
  return content_view_core_ &&
         content_view_core_->DoBrowserControlsShrinkBlinkSize();
}

float RenderWidgetHostViewAndroid::GetTopControlsHeight() const {
  if (!content_view_core_)
    return default_bounds_.x();

  // The height of the browser controls.
  return content_view_core_->GetTopControlsHeightDip();
}

float RenderWidgetHostViewAndroid::GetBottomControlsHeight() const {
  if (!content_view_core_)
    return 0.f;

  // The height of the browser controls.
  return content_view_core_->GetBottomControlsHeightDip();
}

void RenderWidgetHostViewAndroid::UpdateCursor(const WebCursor& cursor) {
  CursorInfo cursor_info;
  cursor.GetCursorInfo(&cursor_info);
  view_.OnCursorChanged(cursor_info.type, cursor_info.custom_image,
                        cursor_info.hotspot);
}

void RenderWidgetHostViewAndroid::SetIsLoading(bool is_loading) {
  // Do nothing. The UI notification is handled through ContentViewClient which
  // is TabContentsDelegate.
}

// -----------------------------------------------------------------------------
// TextInputManager::Observer implementations.
void RenderWidgetHostViewAndroid::OnUpdateTextInputStateCalled(
    TextInputManager* text_input_manager,
    RenderWidgetHostViewBase* updated_view,
    bool did_change_state) {
  DCHECK_EQ(text_input_manager_, text_input_manager);
  // If there are no active widgets, the TextInputState.type should be reported
  // as none.
  const TextInputState& state =
      GetTextInputManager()->GetActiveWidget()
          ? *GetTextInputManager()->GetTextInputState()
          : TextInputState();

  if (!ime_adapter_android_ || is_in_vr_)
    return;

  ime_adapter_android_->UpdateState(state);
}

void RenderWidgetHostViewAndroid::OnImeCompositionRangeChanged(
    TextInputManager* text_input_manager,
    RenderWidgetHostViewBase* updated_view) {
  DCHECK_EQ(text_input_manager_, text_input_manager);
  const TextInputManager::CompositionRangeInfo* info =
      text_input_manager_->GetCompositionRangeInfo();
  if (!info)
    return;

  std::vector<gfx::RectF> character_bounds;
  for (const gfx::Rect& rect : info->character_bounds)
    character_bounds.emplace_back(rect);

  if (ime_adapter_android_)
    ime_adapter_android_->SetCharacterBounds(character_bounds);
}

void RenderWidgetHostViewAndroid::OnImeCancelComposition(
    TextInputManager* text_input_manager,
    RenderWidgetHostViewBase* updated_view) {
  DCHECK_EQ(text_input_manager_, text_input_manager);
  if (ime_adapter_android_)
    ime_adapter_android_->CancelComposition();
}

void RenderWidgetHostViewAndroid::OnTextSelectionChanged(
    TextInputManager* text_input_manager,
    RenderWidgetHostViewBase* updated_view) {
  DCHECK_EQ(text_input_manager_, text_input_manager);

  // TODO(asimjour): remove the flag and fix text selection popup for
  // virtual reality mode.
  if (is_in_vr_)
    return;

  if (!selection_popup_controller_)
    return;

  RenderWidgetHostImpl* focused_widget = GetFocusedWidget();
  if (!focused_widget || !focused_widget->GetView())
    return;

  const TextInputManager::TextSelection& selection =
      *text_input_manager_->GetTextSelection(focused_widget->GetView());

  selection_popup_controller_->OnSelectionChanged(
      base::UTF16ToUTF8(selection.selected_text()));
}

void RenderWidgetHostViewAndroid::UpdateBackgroundColor(SkColor color) {
  if (cached_background_color_ == color)
    return;

  cached_background_color_ = color;

  view_.OnBackgroundColorChanged(color);
}

void RenderWidgetHostViewAndroid::SetNeedsBeginFrames(bool needs_begin_frames) {
  TRACE_EVENT1("cc", "RenderWidgetHostViewAndroid::SetNeedsBeginFrames",
               "needs_begin_frames", needs_begin_frames);
  if (needs_begin_frames)
    AddBeginFrameRequest(PERSISTENT_BEGIN_FRAME);
  else
    ClearBeginFrameRequest(PERSISTENT_BEGIN_FRAME);
}

viz::SurfaceId RenderWidgetHostViewAndroid::SurfaceIdForTesting() const {
  return delegated_frame_host_ ? delegated_frame_host_->SurfaceId()
                               : viz::SurfaceId();
}

viz::FrameSinkId RenderWidgetHostViewAndroid::FrameSinkIdAtPoint(
    viz::SurfaceHittestDelegate* delegate,
    const gfx::Point& point,
    gfx::Point* transformed_point) {
  if (!delegated_frame_host_)
    return viz::FrameSinkId();

  float scale_factor = view_.GetDipScale();
  DCHECK_GT(scale_factor, 0);
  // The surface hittest happens in device pixels, so we need to convert the
  // |point| from DIPs to pixels before hittesting.
  gfx::Point point_in_pixels = gfx::ConvertPointToPixel(scale_factor, point);

  viz::SurfaceId surface_id = delegated_frame_host_->SurfaceId();
  if (surface_id.is_valid()) {
    viz::SurfaceHittest hittest(delegate,
                                GetFrameSinkManager()->surface_manager());
    gfx::Transform target_transform;
    surface_id = hittest.GetTargetSurfaceAtPoint(surface_id, point_in_pixels,
                                                 &target_transform);
    *transformed_point = point_in_pixels;
    if (surface_id.is_valid())
      target_transform.TransformPoint(transformed_point);
    *transformed_point =
        gfx::ConvertPointToDIP(scale_factor, *transformed_point);
  }

  // It is possible that the renderer has not yet produced a surface, in which
  // case we return our current namespace.
  if (!surface_id.is_valid())
    return GetFrameSinkId();
  return surface_id.frame_sink_id();
}

void RenderWidgetHostViewAndroid::ProcessMouseEvent(
    const blink::WebMouseEvent& event,
    const ui::LatencyInfo& latency) {
  host_->ForwardMouseEventWithLatencyInfo(event, latency);
}

void RenderWidgetHostViewAndroid::ProcessMouseWheelEvent(
    const blink::WebMouseWheelEvent& event,
    const ui::LatencyInfo& latency) {
  host_->ForwardWheelEventWithLatencyInfo(event, latency);
}

void RenderWidgetHostViewAndroid::ProcessTouchEvent(
    const blink::WebTouchEvent& event,
    const ui::LatencyInfo& latency) {
  host_->ForwardTouchEventWithLatencyInfo(event, latency);
}

void RenderWidgetHostViewAndroid::ProcessGestureEvent(
    const blink::WebGestureEvent& event,
    const ui::LatencyInfo& latency) {
  host_->ForwardGestureEventWithLatencyInfo(event, latency);
}

bool RenderWidgetHostViewAndroid::TransformPointToLocalCoordSpace(
    const gfx::Point& point,
    const viz::SurfaceId& original_surface,
    gfx::Point* transformed_point) {
  if (!delegated_frame_host_)
    return false;

  float scale_factor = view_.GetDipScale();
  DCHECK_GT(scale_factor, 0);
  // Transformations use physical pixels rather than DIP, so conversion
  // is necessary.
  gfx::Point point_in_pixels = gfx::ConvertPointToPixel(scale_factor, point);

  viz::SurfaceId surface_id = delegated_frame_host_->SurfaceId();
  if (!surface_id.is_valid())
    return false;

  if (original_surface == surface_id)
    return true;

  *transformed_point = point_in_pixels;
  viz::SurfaceHittest hittest(nullptr,
                              GetFrameSinkManager()->surface_manager());
  if (!hittest.TransformPointToTargetSurface(original_surface, surface_id,
                                             transformed_point))
    return false;

  *transformed_point = gfx::ConvertPointToDIP(scale_factor, *transformed_point);
  return true;
}

bool RenderWidgetHostViewAndroid::TransformPointToCoordSpaceForView(
    const gfx::Point& point,
    RenderWidgetHostViewBase* target_view,
    gfx::Point* transformed_point) {
  if (target_view == this || !delegated_frame_host_) {
    *transformed_point = point;
    return true;
  }

  // In TransformPointToLocalCoordSpace() there is a Point-to-Pixel conversion,
  // but it is not necessary here because the final target view is responsible
  // for converting before computing the final transform.
  viz::SurfaceId surface_id = delegated_frame_host_->SurfaceId();
  if (!surface_id.is_valid())
    return false;

  return target_view->TransformPointToLocalCoordSpace(point, surface_id,
                                                      transformed_point);
}

base::WeakPtr<RenderWidgetHostViewAndroid>
RenderWidgetHostViewAndroid::GetWeakPtrAndroid() {
  return weak_ptr_factory_.GetWeakPtr();
}

bool RenderWidgetHostViewAndroid::OnTouchEvent(
    const ui::MotionEventAndroid& event) {
  RecordToolTypeForActionDown(event);

  if (event.for_touch_handle())
    return OnTouchHandleEvent(event);

  if (!host_ || !host_->delegate())
    return false;

  ComputeEventLatencyOSTouchHistograms(event);

  // Receiving any other touch event before the double-tap timeout expires
  // cancels opening the spellcheck menu.
  if (text_suggestion_host_)
    text_suggestion_host_->StopSpellCheckMenuTimer();

  // If a browser-based widget consumes the touch event, it's critical that
  // touch event interception be disabled. This avoids issues with
  // double-handling for embedder-detected gestures like side swipe.
  if (OnTouchHandleEvent(event)) {
    RequestDisallowInterceptTouchEvent();
    return true;
  }

  if (stylus_text_selector_.OnTouchEvent(event)) {
    RequestDisallowInterceptTouchEvent();
    return true;
  }

  ui::FilteredGestureProvider::TouchHandlingResult result =
      gesture_provider_.OnTouchEvent(event);
  if (!result.succeeded)
    return false;

  blink::WebTouchEvent web_event = ui::CreateWebTouchEventFromMotionEvent(
      event, result.moved_beyond_slop_region);
  ui::LatencyInfo latency_info(ui::SourceEventType::TOUCH);
  latency_info.AddLatencyNumber(ui::INPUT_EVENT_LATENCY_UI_COMPONENT, 0, 0);
  if (host_->delegate()->GetInputEventRouter()) {
    host_->delegate()->GetInputEventRouter()->RouteTouchEvent(this, &web_event,
                                                              latency_info);
  } else {
    host_->ForwardTouchEventWithLatencyInfo(web_event, latency_info);
  }

  // Send a proactive BeginFrame for this vsync to reduce scroll latency for
  // scroll-inducing touch events. Note that Android's Choreographer ensures
  // that BeginFrame requests made during ACTION_MOVE dispatch will be honored
  // in the same vsync phase.
  if (observing_root_window_ && result.moved_beyond_slop_region)
    AddBeginFrameRequest(BEGIN_FRAME);

  return true;
}

bool RenderWidgetHostViewAndroid::OnTouchHandleEvent(
    const ui::MotionEvent& event) {
  return touch_selection_controller_ &&
         touch_selection_controller_->WillHandleTouchEvent(event);
}

int RenderWidgetHostViewAndroid::GetTouchHandleHeight() {
  if (!touch_selection_controller_)
    return 0;
  return static_cast<int>(
      touch_selection_controller_->GetStartHandleRect().height());
}

void RenderWidgetHostViewAndroid::ResetGestureDetection() {
  const ui::MotionEvent* current_down_event =
      gesture_provider_.GetCurrentDownEvent();
  if (!current_down_event) {
    // A hard reset ensures prevention of any timer-based events that might fire
    // after a touch sequence has ended.
    gesture_provider_.ResetDetection();
    return;
  }

  std::unique_ptr<ui::MotionEvent> cancel_event = current_down_event->Cancel();
  if (gesture_provider_.OnTouchEvent(*cancel_event).succeeded) {
    bool causes_scrolling = false;
    ui::LatencyInfo latency_info(ui::SourceEventType::TOUCH);
    latency_info.AddLatencyNumber(ui::INPUT_EVENT_LATENCY_UI_COMPONENT, 0, 0);
    blink::WebTouchEvent web_event =
        ui::CreateWebTouchEventFromMotionEvent(*cancel_event, causes_scrolling);
    if (host_->delegate()->GetInputEventRouter()) {
      host_->delegate()->GetInputEventRouter()->RouteTouchEvent(
          this, &web_event, latency_info);
    } else {
      host_->ForwardTouchEventWithLatencyInfo(web_event, latency_info);
    }
  }
}

void RenderWidgetHostViewAndroid::OnDidNavigateMainFrameToNewPage() {
  ResetGestureDetection();
}

void RenderWidgetHostViewAndroid::SetDoubleTapSupportEnabled(bool enabled) {
  gesture_provider_.SetDoubleTapSupportForPlatformEnabled(enabled);
}

void RenderWidgetHostViewAndroid::SetMultiTouchZoomSupportEnabled(
    bool enabled) {
  gesture_provider_.SetMultiTouchZoomSupportEnabled(enabled);
}

void RenderWidgetHostViewAndroid::FocusedNodeChanged(
    bool is_editable_node,
    const gfx::Rect& node_bounds_in_screen) {
  if (ime_adapter_android_)
    ime_adapter_android_->FocusedNodeChanged(is_editable_node);
}

void RenderWidgetHostViewAndroid::RenderProcessGone(
    base::TerminationStatus status, int error_code) {
  Destroy();
}

void RenderWidgetHostViewAndroid::Destroy() {
  host_->ViewDestroyed();
  SetContentViewCore(NULL);
  delegated_frame_host_.reset();

  // The RenderWidgetHost's destruction led here, so don't call it.
  host_ = NULL;

  if (GetTextInputManager() && GetTextInputManager()->HasObserver(this))
    GetTextInputManager()->RemoveObserver(this);

  for (auto& observer : destruction_observers_)
    observer.RenderWidgetHostViewDestroyed(this);
  destruction_observers_.Clear();

  delete this;
}

void RenderWidgetHostViewAndroid::SetTooltipText(
    const base::string16& tooltip_text) {
  // Tooltips don't makes sense on Android.
}

void RenderWidgetHostViewAndroid::SetBackgroundColor(SkColor color) {
  background_color_ = color;

  DCHECK(SkColorGetA(color) == SK_AlphaOPAQUE ||
         SkColorGetA(color) == SK_AlphaTRANSPARENT);
  host_->SetBackgroundOpaque(SkColorGetA(color) == SK_AlphaOPAQUE);
  UpdateBackgroundColor(color);
}

SkColor RenderWidgetHostViewAndroid::background_color() const {
  return background_color_;
}

void RenderWidgetHostViewAndroid::CopyFromSurface(
    const gfx::Rect& src_subrect,
    const gfx::Size& dst_size,
    const ReadbackRequestCallback& callback,
    const SkColorType preferred_color_type) {
  TRACE_EVENT0("cc", "RenderWidgetHostViewAndroid::CopyFromSurface");
  if (!host_ || !IsSurfaceAvailableForCopy()) {
    callback.Run(SkBitmap(), READBACK_SURFACE_UNAVAILABLE);
    return;
  }
  if (!(view_.GetWindowAndroid())) {
    callback.Run(SkBitmap(), READBACK_FAILED);
    return;
  }

  base::TimeTicks start_time = base::TimeTicks::Now();
  float device_scale_factor = view_.GetDipScale();
  gfx::Size dst_size_in_pixel =
      gfx::ConvertRectToPixel(device_scale_factor, gfx::Rect(dst_size)).size();
  // Note: When |src_subrect| is empty, a conversion from the view size must be
  // made instead of using |current_frame_size_|. The latter sometimes also
  // includes extra height for the toolbar UI, which is not intended for
  // capture.
  gfx::Rect src_subrect_in_pixel = gfx::ConvertRectToPixel(
      device_scale_factor, src_subrect.IsEmpty()
                               ? gfx::Rect(GetVisibleViewportSize())
                               : src_subrect);

  if (!using_browser_compositor_) {
    SynchronousCopyContents(src_subrect_in_pixel, dst_size_in_pixel, callback,
                            preferred_color_type);
    UMA_HISTOGRAM_TIMES("Compositing.CopyFromSurfaceTimeSynchronous",
                        base::TimeTicks::Now() - start_time);
    return;
  }

  ui::WindowAndroidCompositor* compositor =
      view_.GetWindowAndroid()->GetCompositor();
  DCHECK(compositor);
  DCHECK(delegated_frame_host_);
  scoped_refptr<PendingReadbackLock> readback_lock(
      g_pending_readback_lock ? g_pending_readback_lock
                              : new PendingReadbackLock);
  delegated_frame_host_->RequestCopyOfSurface(
      compositor, src_subrect_in_pixel,
      base::Bind(&PrepareTextureCopyOutputResult, dst_size_in_pixel,
                 preferred_color_type, start_time, callback, readback_lock));
}

void RenderWidgetHostViewAndroid::ShowDisambiguationPopup(
    const gfx::Rect& rect_pixels, const SkBitmap& zoomed_bitmap) {
  if (!popup_zoomer_)
    return;

  popup_zoomer_->ShowPopup(rect_pixels, zoomed_bitmap);
}

std::unique_ptr<SyntheticGestureTarget>
RenderWidgetHostViewAndroid::CreateSyntheticGestureTarget() {
  return std::unique_ptr<SyntheticGestureTarget>(
      new SyntheticGestureTargetAndroid(host_, &view_));
}

void RenderWidgetHostViewAndroid::SendReclaimCompositorResources(
    bool is_swap_ack) {
  DCHECK(host_);
  if (is_swap_ack) {
    renderer_compositor_frame_sink_->DidReceiveCompositorFrameAck(
        surface_returned_resources_);
  } else {
    renderer_compositor_frame_sink_->ReclaimResources(
        surface_returned_resources_);
  }
  surface_returned_resources_.clear();
}

void RenderWidgetHostViewAndroid::DidReceiveCompositorFrameAck() {
  RunAckCallbacks();
}

void RenderWidgetHostViewAndroid::ReclaimResources(
    const std::vector<viz::ReturnedResource>& resources) {
  if (resources.empty())
    return;
  std::copy(resources.begin(), resources.end(),
            std::back_inserter(surface_returned_resources_));
  if (ack_callbacks_.empty())
    SendReclaimCompositorResources(false /* is_swap_ack */);
}

void RenderWidgetHostViewAndroid::DidCreateNewRendererCompositorFrameSink(
    viz::mojom::CompositorFrameSinkClient* renderer_compositor_frame_sink) {
  if (!delegated_frame_host_) {
    DCHECK(!using_browser_compositor_);
    // We don't expect RendererCompositorFrameSink on Android WebView.
    // (crbug.com/721102)
    bad_message::ReceivedBadMessage(host_->GetProcess(),
                                    bad_message::RWH_BAD_FRAME_SINK_REQUEST);
    return;
  }
  delegated_frame_host_->CompositorFrameSinkChanged();
  renderer_compositor_frame_sink_ = renderer_compositor_frame_sink;
  // Accumulated resources belong to the old RendererCompositorFrameSink and
  // should not be returned.
  surface_returned_resources_.clear();
}

void RenderWidgetHostViewAndroid::EvictFrameIfNecessary() {
  if (!base::FeatureList::IsEnabled(
          features::kHideIncorrectlySizedFullscreenFrames)) {
    return;
  }
  if (host_->delegate()->IsFullscreenForCurrentTab() &&
      current_surface_size_ != view_.GetPhysicalBackingSize()) {
    // When we're in a fullscreen and the frame size doesn't match the view
    // size (e.g. during a fullscreen rotation), we show black instead of the
    // incorrectly-sized frame.
    EvictDelegatedFrame();
    UpdateBackgroundColor(SK_ColorBLACK);
  }
}

void RenderWidgetHostViewAndroid::SubmitCompositorFrame(
    const viz::LocalSurfaceId& local_surface_id,
    cc::CompositorFrame frame) {
  if (!delegated_frame_host_) {
    DCHECK(!using_browser_compositor_);
    return;
  }

  last_scroll_offset_ = frame.metadata.root_scroll_offset;
  DCHECK(!frame.render_pass_list.empty());

  cc::RenderPass* root_pass = frame.render_pass_list.back().get();
  current_surface_size_ = root_pass->output_rect.size();
  bool is_transparent = root_pass->has_transparent_background;

  cc::CompositorFrameMetadata metadata = frame.metadata.Clone();

  bool has_content = !current_surface_size_.IsEmpty();

  base::Closure ack_callback =
      base::Bind(&RenderWidgetHostViewAndroid::SendReclaimCompositorResources,
                 weak_ptr_factory_.GetWeakPtr(), true /* is_swap_ack */);

  ack_callbacks_.push(ack_callback);

  viz::BeginFrameAck ack = frame.metadata.begin_frame_ack;
  if (!has_content) {
    DestroyDelegatedContent();

    ack.has_damage = false;
    OnDidNotProduceFrame(ack);
  } else {
    delegated_frame_host_->SubmitCompositorFrame(local_surface_id,
                                                 std::move(frame));
    frame_evictor_->SwappedFrame(!host_->is_hidden());
    AcknowledgeBeginFrame(ack);
  }

  if (host_->is_hidden())
    RunAckCallbacks();

  // As the metadata update may trigger view invalidation, always call it after
  // any potential compositor scheduling.
  OnFrameMetadataUpdated(std::move(metadata), is_transparent);
}

void RenderWidgetHostViewAndroid::DestroyDelegatedContent() {
  DCHECK(!delegated_frame_host_ ||
         delegated_frame_host_->HasDelegatedContent() ==
             frame_evictor_->HasFrame());

  if (!delegated_frame_host_)
    return;

  if (!delegated_frame_host_->HasDelegatedContent())
    return;

  frame_evictor_->DiscardedFrame();
  delegated_frame_host_->DestroyDelegatedContent();
  current_surface_size_.SetSize(0, 0);
}

void RenderWidgetHostViewAndroid::OnDidNotProduceFrame(
    const viz::BeginFrameAck& ack) {
  if (!delegated_frame_host_) {
    // We are not using the browser compositor and there's no DisplayScheduler
    // that needs to be notified about the BeginFrameAck, so we can drop it.
    DCHECK(!using_browser_compositor_);
    return;
  }

  delegated_frame_host_->DidNotProduceFrame(ack);
  AcknowledgeBeginFrame(ack);
}

void RenderWidgetHostViewAndroid::AcknowledgeBeginFrame(
    const viz::BeginFrameAck& ack) {
  if (begin_frame_source_)
    begin_frame_source_->DidFinishFrame(this);
}

void RenderWidgetHostViewAndroid::ClearCompositorFrame() {
  DestroyDelegatedContent();
}

void RenderWidgetHostViewAndroid::SynchronousFrameMetadata(
    cc::CompositorFrameMetadata frame_metadata) {
  if (!content_view_core_)
    return;

  bool is_mobile_optimized = IsMobileOptimizedFrame(frame_metadata);

  if (host_ && host_->input_router()) {
    host_->input_router()->NotifySiteIsMobileOptimized(
        is_mobile_optimized);
  }

  if (host_ && frame_metadata.frame_token)
    host_->DidProcessFrame(frame_metadata.frame_token);

  // This is a subset of OnSwapCompositorFrame() used in the synchronous
  // compositor flow.
  OnFrameMetadataUpdated(frame_metadata.Clone(), false);

  // DevTools ScreenCast support for Android WebView.
  RenderFrameHost* frame_host = RenderViewHost::From(host_)->GetMainFrame();
  if (frame_host) {
    RenderFrameDevToolsAgentHost::SignalSynchronousSwapCompositorFrame(
        frame_host,
        std::move(frame_metadata));
  }
}

void RenderWidgetHostViewAndroid::SetSynchronousCompositorClient(
      SynchronousCompositorClient* client) {
  synchronous_compositor_client_ = client;
  if (!sync_compositor_ && synchronous_compositor_client_) {
    sync_compositor_ = SynchronousCompositorHost::Create(this);
  }
}

void RenderWidgetHostViewAndroid::OnOverscrollRefreshHandlerAvailable() {
  DCHECK(!overscroll_controller_);
  CreateOverscrollControllerIfPossible();
}

bool RenderWidgetHostViewAndroid::SupportsAnimation() const {
  // The synchronous (WebView) compositor does not have a proper browser
  // compositor with which to drive animations.
  return using_browser_compositor_;
}

void RenderWidgetHostViewAndroid::SetNeedsAnimate() {
  DCHECK(view_.GetWindowAndroid());
  DCHECK(using_browser_compositor_);
  view_.GetWindowAndroid()->SetNeedsAnimate();
}

void RenderWidgetHostViewAndroid::MoveCaret(const gfx::PointF& position) {
  MoveCaret(gfx::Point(position.x(), position.y()));
}

void RenderWidgetHostViewAndroid::MoveRangeSelectionExtent(
    const gfx::PointF& extent) {
  DCHECK(content_view_core_);
  content_view_core_->MoveRangeSelectionExtent(extent);
}

void RenderWidgetHostViewAndroid::SelectBetweenCoordinates(
    const gfx::PointF& base,
    const gfx::PointF& extent) {
  DCHECK(content_view_core_);
  content_view_core_->SelectBetweenCoordinates(base, extent);
}

void RenderWidgetHostViewAndroid::OnSelectionEvent(
    ui::SelectionEventType event) {
  DCHECK(selection_popup_controller_);
  DCHECK(touch_selection_controller_);
  // If a selection drag has started, it has taken over the active touch
  // sequence. Immediately cancel gesture detection and any downstream touch
  // listeners (e.g., web content) to communicate this transfer.
  if (event == ui::SELECTION_HANDLES_SHOWN &&
      gesture_provider_.GetCurrentDownEvent()) {
    ResetGestureDetection();
  }
  selection_popup_controller_->OnSelectionEvent(
      event, GetSelectionRect(*touch_selection_controller_));
}

ui::TouchSelectionControllerClient*
RenderWidgetHostViewAndroid::GetSelectionControllerClientManagerForTesting() {
  return touch_selection_controller_client_manager_.get();
}

void RenderWidgetHostViewAndroid::SetSelectionControllerClientForTesting(
    std::unique_ptr<ui::TouchSelectionControllerClient> client) {
  touch_selection_controller_client_for_test_.swap(client);

  touch_selection_controller_ = CreateSelectionController(
      touch_selection_controller_client_for_test_.get(), content_view_core_);
}

std::unique_ptr<ui::TouchHandleDrawable>
RenderWidgetHostViewAndroid::CreateDrawable() {
  DCHECK(content_view_core_);
  if (!using_browser_compositor_) {
    if (!sync_compositor_)
      return nullptr;
    return std::unique_ptr<ui::TouchHandleDrawable>(
        sync_compositor_->client()->CreateDrawable());
  }
  base::android::ScopedJavaLocalRef<jobject> activityContext =
      content_view_core_->GetContext();
  // If activityContext is null then Application context is used instead on
  // the java side in CompositedTouchHandleDrawable.
  return std::unique_ptr<ui::TouchHandleDrawable>(
      new CompositedTouchHandleDrawable(
          content_view_core_->GetViewAndroid()->GetLayer(), view_.GetDipScale(),
          activityContext));
}

void RenderWidgetHostViewAndroid::SynchronousCopyContents(
    const gfx::Rect& src_subrect_in_pixel,
    const gfx::Size& dst_size_in_pixel,
    const ReadbackRequestCallback& callback,
    const SkColorType color_type) {
  // TODO(crbug/698974): [BUG] Current implementation does not support read-back
  // of regions that do not originate at (0,0).
  const gfx::Size& input_size_in_pixel = src_subrect_in_pixel.size();
  DCHECK(!input_size_in_pixel.IsEmpty());

  gfx::Size output_size_in_pixel;
  if (dst_size_in_pixel.IsEmpty())
    output_size_in_pixel = input_size_in_pixel;
  else
    output_size_in_pixel = dst_size_in_pixel;
  int output_width = output_size_in_pixel.width();
  int output_height = output_size_in_pixel.height();

  if (!sync_compositor_) {
    callback.Run(SkBitmap(), READBACK_FAILED);
    return;
  }

  SkBitmap bitmap;
  bitmap.allocPixels(SkImageInfo::Make(output_width,
                                       output_height,
                                       color_type,
                                       kPremul_SkAlphaType));
  SkCanvas canvas(bitmap);
  canvas.scale(
      (float)output_width / (float)input_size_in_pixel.width(),
      (float)output_height / (float)input_size_in_pixel.height());
  sync_compositor_->DemandDrawSw(&canvas);
  callback.Run(bitmap, READBACK_SUCCESS);
}

WebContentsAccessibilityAndroid*
RenderWidgetHostViewAndroid::GetWebContentsAccessibilityAndroid() const {
  return static_cast<WebContentsAccessibilityAndroid*>(
      web_contents_accessibility_);
}

void RenderWidgetHostViewAndroid::OnFrameMetadataUpdated(
    const cc::CompositorFrameMetadata& frame_metadata,
    bool is_transparent) {
  bool is_mobile_optimized = IsMobileOptimizedFrame(frame_metadata);
  gesture_provider_.SetDoubleTapSupportForPageEnabled(!is_mobile_optimized);

  float dip_scale = view_.GetDipScale();
  float top_controls_pix = frame_metadata.top_controls_height * dip_scale;
  float top_content_offset = frame_metadata.top_controls_height *
                             frame_metadata.top_controls_shown_ratio;
  float top_shown_pix = top_content_offset * dip_scale;

  if (ime_adapter_android_)
    ime_adapter_android_->UpdateFrameInfo(frame_metadata.selection.start,
                                          dip_scale, top_shown_pix);

  auto* wcax = GetWebContentsAccessibilityAndroid();
  if (wcax)
    wcax->UpdateFrameInfo();

  if (!content_view_core_)
    return;

  if (overscroll_controller_)
    overscroll_controller_->OnFrameMetadataUpdated(frame_metadata);

  if (touch_selection_controller_) {
    DCHECK(touch_selection_controller_client_manager_);
    touch_selection_controller_client_manager_->UpdateClientSelectionBounds(
        frame_metadata.selection.start, frame_metadata.selection.end, this,
        nullptr);
    touch_selection_controller_client_manager_->SetPageScaleFactor(
        frame_metadata.page_scale_factor);

    // Set parameters for adaptive handle orientation.
    gfx::SizeF viewport_size(frame_metadata.scrollable_viewport_size);
    viewport_size.Scale(frame_metadata.page_scale_factor);
    gfx::RectF viewport_rect(0.0f, frame_metadata.top_controls_height *
                                       frame_metadata.top_controls_shown_ratio,
                             viewport_size.width(), viewport_size.height());
    touch_selection_controller_->OnViewportChanged(viewport_rect);
  }

  UpdateBackgroundColor(is_transparent ? SK_ColorTRANSPARENT
                                       : frame_metadata.root_background_color);

  view_.UpdateFrameInfo({frame_metadata.scrollable_viewport_size,
                         frame_metadata.page_scale_factor, top_content_offset});

  bool top_changed = !FloatEquals(top_shown_pix, prev_top_shown_pix_);
  if (top_changed) {
    float translate = top_shown_pix - top_controls_pix;
    view_.OnTopControlsChanged(translate, top_shown_pix);
    prev_top_shown_pix_ = top_shown_pix;
  }

  float bottom_controls_pix = frame_metadata.bottom_controls_height * dip_scale;
  float bottom_shown_pix =
      bottom_controls_pix * frame_metadata.bottom_controls_shown_ratio;
  bool bottom_changed = !FloatEquals(bottom_shown_pix, prev_bottom_shown_pix_);
  if (bottom_changed) {
    float translate = bottom_controls_pix - bottom_shown_pix;
    view_.OnBottomControlsChanged(translate, bottom_shown_pix);
    prev_bottom_shown_pix_ = bottom_shown_pix;
  }

  // All offsets and sizes are in CSS pixels.
  content_view_core_->UpdateFrameInfo(
      frame_metadata.root_scroll_offset, frame_metadata.page_scale_factor,
      gfx::Vector2dF(frame_metadata.min_page_scale_factor,
                     frame_metadata.max_page_scale_factor),
      frame_metadata.root_layer_size, frame_metadata.scrollable_viewport_size,
      top_content_offset, top_shown_pix, top_changed, is_mobile_optimized);

  EvictFrameIfNecessary();
}

void RenderWidgetHostViewAndroid::ShowInternal() {
  bool show = is_showing_ && is_window_activity_started_ && is_window_visible_;
  if (!show)
    return;

  if (!host_ || !host_->is_hidden())
    return;

  view_.GetLayer()->SetHideLayerAndSubtree(false);

  frame_evictor_->SetVisible(true);

  if (overscroll_controller_)
    overscroll_controller_->Enable();

  host_->WasShown(ui::LatencyInfo());

  if (content_view_core_ && view_.GetWindowAndroid()) {
    StartObservingRootWindow();
    AddBeginFrameRequest(BEGIN_FRAME);
  }
}

void RenderWidgetHostViewAndroid::HideInternal() {
  DCHECK(!is_showing_ || !is_window_activity_started_ || !is_window_visible_)
      << "Hide called when the widget should be shown.";

  // Only preserve the frontbuffer if the activity was stopped while the
  // window is still visible. This avoids visual artificts when transitioning
  // between activities.
  bool hide_frontbuffer = is_window_activity_started_ || !is_window_visible_;

  // Only stop observing the root window if the widget has been explicitly
  // hidden and the frontbuffer is being cleared. This allows window visibility
  // notifications to eventually clear the frontbuffer.
  bool stop_observing_root_window = !is_showing_ && hide_frontbuffer;

  if (hide_frontbuffer) {
    view_.GetLayer()->SetHideLayerAndSubtree(true);
    frame_evictor_->SetVisible(false);
  }

  if (stop_observing_root_window) {
    DCHECK(!is_showing_);
    StopObservingRootWindow();
  }

  if (!host_ || host_->is_hidden())
    return;

  if (overscroll_controller_)
    overscroll_controller_->Disable();

  RunAckCallbacks();

  // Inform the renderer that we are being hidden so it can reduce its resource
  // utilization.
  host_->WasHidden();
}

void RenderWidgetHostViewAndroid::SetBeginFrameSource(
    viz::BeginFrameSource* begin_frame_source) {
  if (begin_frame_source_ == begin_frame_source)
    return;

  if (begin_frame_source_ && outstanding_begin_frame_requests_)
    begin_frame_source_->RemoveObserver(this);
  begin_frame_source_ = begin_frame_source;
  if (begin_frame_source_ && outstanding_begin_frame_requests_)
    begin_frame_source_->AddObserver(this);
}

void RenderWidgetHostViewAndroid::AddBeginFrameRequest(
    BeginFrameRequestType request) {
  uint32_t prior_requests = outstanding_begin_frame_requests_;
  outstanding_begin_frame_requests_ = prior_requests | request;

  // Note that if we don't currently have a BeginFrameSource, outstanding begin
  // frame requests will be pushed if/when we get one during
  // |StartObservingRootWindow()| or when the DelegatedFrameHostAndroid sets it.
  viz::BeginFrameSource* source = begin_frame_source_;
  if (source && outstanding_begin_frame_requests_ && !prior_requests)
    source->AddObserver(this);
}

void RenderWidgetHostViewAndroid::ClearBeginFrameRequest(
    BeginFrameRequestType request) {
  uint32_t prior_requests = outstanding_begin_frame_requests_;
  outstanding_begin_frame_requests_ = prior_requests & ~request;

  viz::BeginFrameSource* source = begin_frame_source_;
  if (source && !outstanding_begin_frame_requests_ && prior_requests)
    source->RemoveObserver(this);
}

void RenderWidgetHostViewAndroid::StartObservingRootWindow() {
  DCHECK(content_view_core_);
  DCHECK(view_.GetWindowAndroid());
  DCHECK(is_showing_);
  if (observing_root_window_)
    return;

  observing_root_window_ = true;
  SendBeginFramePaused();
  view_.GetWindowAndroid()->AddObserver(this);
  // When using browser compositor, DelegatedFrameHostAndroid provides the BFS.
  if (!using_browser_compositor_)
    SetBeginFrameSource(view_.GetWindowAndroid()->GetBeginFrameSource());

  ui::WindowAndroidCompositor* compositor =
      view_.GetWindowAndroid()->GetCompositor();
  if (compositor) {
    delegated_frame_host_->AttachToCompositor(compositor);
  }
}

void RenderWidgetHostViewAndroid::StopObservingRootWindow() {
  if (!(view_.GetWindowAndroid())) {
    DCHECK(!observing_root_window_);
    return;
  }

  if (!observing_root_window_)
    return;

  // Reset window state variables to their defaults.
  is_window_activity_started_ = true;
  is_window_visible_ = true;
  observing_root_window_ = false;
  SendBeginFramePaused();
  view_.GetWindowAndroid()->RemoveObserver(this);
  if (!using_browser_compositor_)
    SetBeginFrameSource(nullptr);
  // If the DFH has already been destroyed, it will have cleaned itself up.
  // This happens in some WebView cases.
  if (delegated_frame_host_)
    delegated_frame_host_->DetachFromCompositor();
  DCHECK(!begin_frame_source_);
}

void RenderWidgetHostViewAndroid::SendBeginFrame(viz::BeginFrameArgs args) {
  TRACE_EVENT2("cc", "RenderWidgetHostViewAndroid::SendBeginFrame",
               "frame_number", args.sequence_number, "frame_time_us",
               args.frame_time.ToInternalValue());

  // Synchronous compositor does not use deadline-based scheduling.
  // TODO(brianderson): Replace this hardcoded deadline after Android
  // switches to Surfaces and the Browser's commit isn't in the critical path.
  args.deadline = sync_compositor_ ? base::TimeTicks()
  : args.frame_time + (args.interval * 0.6);
  if (sync_compositor_) {
    host_->Send(new ViewMsg_BeginFrame(host_->GetRoutingID(), args));
    sync_compositor_->DidSendBeginFrame(view_.GetWindowAndroid());
  } else if (renderer_compositor_frame_sink_) {
    renderer_compositor_frame_sink_->OnBeginFrame(args);
  }
}

bool RenderWidgetHostViewAndroid::Animate(base::TimeTicks frame_time) {
  bool needs_animate = false;
  if (overscroll_controller_ && !is_in_vr_) {
    needs_animate |= overscroll_controller_->Animate(
        frame_time, content_view_core_->GetViewAndroid()->GetLayer());
  }
  // TODO(wjmaclean): Investigate how animation here does or doesn't affect
  // an OOPIF client.
  if (touch_selection_controller_)
    needs_animate |= touch_selection_controller_->Animate(frame_time);
  return needs_animate;
}

void RenderWidgetHostViewAndroid::RequestDisallowInterceptTouchEvent() {
  if (content_view_core_)
    content_view_core_->RequestDisallowInterceptTouchEvent();
}

void RenderWidgetHostViewAndroid::EvictDelegatedFrame() {
  DestroyDelegatedContent();
}

bool RenderWidgetHostViewAndroid::HasAcceleratedSurface(
    const gfx::Size& desired_size) {
  NOTREACHED();
  return false;
}

// TODO(jrg): Find out the implications and answer correctly here,
// as we are returning the WebView and not root window bounds.
gfx::Rect RenderWidgetHostViewAndroid::GetBoundsInRootWindow() {
  return GetViewBounds();
}

void RenderWidgetHostViewAndroid::ProcessAckedTouchEvent(
    const TouchEventWithLatencyInfo& touch, InputEventAckState ack_result) {
  const bool event_consumed = ack_result == INPUT_EVENT_ACK_STATE_CONSUMED;
  gesture_provider_.OnTouchEventAck(
      touch.event.unique_touch_event_id, event_consumed,
      InputEventAckStateIsSetNonBlocking(ack_result));
  if (touch.event.touch_start_or_first_touch_move && event_consumed &&
      host_->delegate() && host_->delegate()->GetInputEventRouter()) {
    host_->delegate()
        ->GetInputEventRouter()
        ->OnHandledTouchStartOrFirstTouchMove(
            touch.event.unique_touch_event_id);
  }
}

void RenderWidgetHostViewAndroid::GestureEventAck(
    const blink::WebGestureEvent& event,
    InputEventAckState ack_result) {
  if (overscroll_controller_)
    overscroll_controller_->OnGestureEventAck(event, ack_result);

  if (content_view_core_)
    content_view_core_->OnGestureEventAck(event, ack_result);
}

InputEventAckState RenderWidgetHostViewAndroid::FilterInputEvent(
    const blink::WebInputEvent& input_event) {
  if (overscroll_controller_ &&
      blink::WebInputEvent::IsGestureEventType(input_event.GetType()) &&
      overscroll_controller_->WillHandleGestureEvent(
          static_cast<const blink::WebGestureEvent&>(input_event))) {
    return INPUT_EVENT_ACK_STATE_CONSUMED;
  }

  if (content_view_core_ && content_view_core_->FilterInputEvent(input_event))
    return INPUT_EVENT_ACK_STATE_CONSUMED;

  if (!host_)
    return INPUT_EVENT_ACK_STATE_NOT_CONSUMED;

  if (input_event.GetType() == blink::WebInputEvent::kGestureTapDown ||
      input_event.GetType() == blink::WebInputEvent::kTouchStart) {
    GpuProcessHost::CallOnIO(GpuProcessHost::GPU_PROCESS_KIND_SANDBOXED,
                             false /* force_create */, base::Bind(&WakeUpGpu));
  }

  return INPUT_EVENT_ACK_STATE_NOT_CONSUMED;
}

InputEventAckState RenderWidgetHostViewAndroid::FilterChildGestureEvent(
    const blink::WebGestureEvent& gesture_event) {
  if (overscroll_controller_ &&
      overscroll_controller_->WillHandleGestureEvent(gesture_event))
    return INPUT_EVENT_ACK_STATE_CONSUMED;
  return INPUT_EVENT_ACK_STATE_NOT_CONSUMED;
}

BrowserAccessibilityManager*
    RenderWidgetHostViewAndroid::CreateBrowserAccessibilityManager(
        BrowserAccessibilityDelegate* delegate, bool for_root_frame) {
  return new BrowserAccessibilityManagerAndroid(
      BrowserAccessibilityManagerAndroid::GetEmptyDocument(),
      for_root_frame && host_ ? GetWebContentsAccessibilityAndroid() : nullptr,
      delegate);
}

bool RenderWidgetHostViewAndroid::LockMouse() {
  NOTIMPLEMENTED();
  return false;
}

void RenderWidgetHostViewAndroid::UnlockMouse() {
  NOTIMPLEMENTED();
}

// Methods called from the host to the render

void RenderWidgetHostViewAndroid::SendKeyEvent(
    const NativeWebKeyboardEvent& event) {
  if (!host_)
    return;

  RenderWidgetHostImpl* target_host = host_;

  // If there are multiple widgets on the page (such as when there are
  // out-of-process iframes), pick the one that should process this event.
  if (host_->delegate())
    target_host = host_->delegate()->GetFocusedRenderWidgetHost(host_);
  if (!target_host)
    return;

  // Receiving a key event before the double-tap timeout expires cancels opening
  // the spellcheck menu. If the suggestion menu is open, we close the menu.
  if (text_suggestion_host_)
    text_suggestion_host_->OnKeyEvent();

  ui::LatencyInfo latency_info;
  if (event.GetType() == blink::WebInputEvent::kRawKeyDown ||
      event.GetType() == blink::WebInputEvent::kChar) {
    latency_info.set_source_event_type(ui::SourceEventType::KEY_PRESS);
  }
  latency_info.AddLatencyNumber(ui::INPUT_EVENT_LATENCY_UI_COMPONENT, 0, 0);
  target_host->ForwardKeyboardEventWithLatencyInfo(event, latency_info);
}

void RenderWidgetHostViewAndroid::SendMouseEvent(
    const ui::MotionEventAndroid& motion_event,
    int action_button) {
  blink::WebInputEvent::Type webMouseEventType =
      ui::ToWebMouseEventType(motion_event.GetAction());

  if (webMouseEventType == blink::WebInputEvent::kMouseDown)
    UpdateLeftClickCount(action_button, motion_event.GetX(0),
                         motion_event.GetY(0));

  int click_count = 0;

  if (webMouseEventType == blink::WebInputEvent::kMouseDown ||
      webMouseEventType == blink::WebInputEvent::kMouseUp)
    click_count = (action_button == ui::MotionEventAndroid::BUTTON_PRIMARY)
                      ? left_click_count_
                      : 1;

  blink::WebMouseEvent mouse_event = WebMouseEventBuilder::Build(
      webMouseEventType,
      ui::EventTimeStampToSeconds(motion_event.GetEventTime()),
      motion_event.GetX(0), motion_event.GetY(0), motion_event.GetFlags(),
      click_count, motion_event.GetPointerId(0), motion_event.GetPressure(0),
      motion_event.GetOrientation(0), motion_event.GetTiltX(0),
      motion_event.GetTiltY(0), action_button, motion_event.GetToolType(0));

  if (!host_ || !host_->delegate())
    return;

  if (host_->delegate()->GetInputEventRouter()) {
    host_->delegate()->GetInputEventRouter()->RouteMouseEvent(
        this, &mouse_event, ui::LatencyInfo());
  } else {
    host_->ForwardMouseEvent(mouse_event);
  }
}

void RenderWidgetHostViewAndroid::UpdateLeftClickCount(int action_button,
                                                       float mousedown_x,
                                                       float mousedown_y) {
  if (action_button != ui::MotionEventAndroid::BUTTON_PRIMARY) {
    // Reset state if middle or right button was pressed.
    left_click_count_ = 0;
    prev_mousedown_timestamp_ = base::TimeTicks();
    return;
  }

  const base::TimeTicks current_time = base::TimeTicks::Now();
  const base::TimeDelta time_delay = current_time - prev_mousedown_timestamp_;
  const gfx::Point mousedown_point(mousedown_x, mousedown_y);
  const float distance_squared =
      (mousedown_point - prev_mousedown_point_).LengthSquared();
  if (left_click_count_ > 2 || time_delay > kClickCountInterval ||
      distance_squared > kClickCountRadiusSquaredDIP) {
    left_click_count_ = 0;
  }
  left_click_count_++;
  prev_mousedown_timestamp_ = current_time;
  prev_mousedown_point_ = mousedown_point;
}

void RenderWidgetHostViewAndroid::SendMouseWheelEvent(
    const blink::WebMouseWheelEvent& event) {
  if (!host_ || !host_->delegate())
    return;

  ui::LatencyInfo latency_info(ui::SourceEventType::WHEEL);
  latency_info.AddLatencyNumber(ui::INPUT_EVENT_LATENCY_UI_COMPONENT, 0, 0);
  blink::WebMouseWheelEvent wheel_event(event);
  bool should_route_event = !!host_->delegate()->GetInputEventRouter();
  if (wheel_scroll_latching_enabled()) {
    mouse_wheel_phase_handler_.AddPhaseIfNeededAndScheduleEndEvent(
        wheel_event, should_route_event);
  }
  if (should_route_event) {
    host_->delegate()->GetInputEventRouter()->RouteMouseWheelEvent(
        this, &wheel_event, latency_info);
  } else {
    host_->ForwardWheelEventWithLatencyInfo(wheel_event, latency_info);
  }
}

void RenderWidgetHostViewAndroid::SendGestureEvent(
    const blink::WebGestureEvent& event) {
  // Sending a gesture that may trigger overscroll should resume the effect.
  if (overscroll_controller_)
    overscroll_controller_->Enable();

  if (!host_ || !host_->delegate())
    return;

  // We let the touch selection controller see gesture events here, since they
  // may be routed and not make it to FilterInputEvent().
  if (touch_selection_controller_ &&
      event.source_device ==
          blink::WebGestureDevice::kWebGestureDeviceTouchscreen) {
    switch (event.GetType()) {
      case blink::WebInputEvent::kGestureLongPress:
        touch_selection_controller_->HandleLongPressEvent(
            base::TimeTicks() +
                base::TimeDelta::FromSecondsD(event.TimeStampSeconds()),
            gfx::PointF(event.x, event.y));
        break;

      case blink::WebInputEvent::kGestureTap:
        touch_selection_controller_->HandleTapEvent(
            gfx::PointF(event.x, event.y), event.data.tap.tap_count);
        break;

      case blink::WebInputEvent::kGestureScrollBegin:
        touch_selection_controller_->OnScrollBeginEvent();
        break;

      default:
        break;
    }
  }

  ui::LatencyInfo latency_info =
      ui::WebInputEventTraits::CreateLatencyInfoForWebGestureEvent(event);
  if (wheel_scroll_latching_enabled()) {
    if (event.source_device ==
        blink::WebGestureDevice::kWebGestureDeviceTouchscreen) {
      if (event.GetType() == blink::WebInputEvent::kGestureScrollBegin) {
        // If there is a current scroll going on and a new scroll that isn't
        // wheel based, send a synthetic wheel event with kPhaseEnded to cancel
        // the current scroll.
        mouse_wheel_phase_handler_.DispatchPendingWheelEndEvent();
      } else if (event.GetType() == blink::WebInputEvent::kGestureScrollEnd) {
        // Make sure that the next wheel event will have phase = |kPhaseBegan|.
        // This is for maintaining the correct phase info when some of the wheel
        // events get ignored while a touchscreen scroll is going on.
        mouse_wheel_phase_handler_.IgnorePendingWheelEndEvent();
      }

    } else if (event.GetType() == blink::WebInputEvent::kGestureFlingStart &&
               event.source_device ==
                   blink::WebGestureDevice::kWebGestureDeviceTouchpad) {
      // Ignore the pending wheel end event to avoid sending a wheel event with
      // kPhaseEnded before a GFS.
      mouse_wheel_phase_handler_.IgnorePendingWheelEndEvent();
    }
  }
  bool should_route_event = !!host_->delegate()->GetInputEventRouter();
  if (should_route_event) {
    blink::WebGestureEvent gesture_event(event);
    host_->delegate()->GetInputEventRouter()->RouteGestureEvent(
        this, &gesture_event, latency_info);
  } else {
    host_->ForwardGestureEventWithLatencyInfo(event, latency_info);
  }
}

bool RenderWidgetHostViewAndroid::ShowSelectionMenu(
    const ContextMenuParams& params) {
  if (!selection_popup_controller_)
    return false;

  return selection_popup_controller_->ShowSelectionMenu(params,
                                                        GetTouchHandleHeight());
}

void RenderWidgetHostViewAndroid::ResolveTapDisambiguation(
    double timestamp_seconds,
    gfx::Point tap_viewport_offset,
    bool is_long_press) {
  DCHECK(host_);
  host_->Send(new ViewMsg_ResolveTapDisambiguation(
      host_->GetRoutingID(), timestamp_seconds, tap_viewport_offset,
      is_long_press));
}

void RenderWidgetHostViewAndroid::MoveCaret(const gfx::Point& point) {
  if (host_ && host_->delegate())
    host_->delegate()->MoveCaret(point);
}

void RenderWidgetHostViewAndroid::ShowContextMenuAtPoint(
    const gfx::Point& point,
    ui::MenuSourceType source_type) {
  if (host_)
    host_->ShowContextMenuAtPoint(point, source_type);
}

void RenderWidgetHostViewAndroid::DismissTextHandles() {
  if (touch_selection_controller_)
    touch_selection_controller_->HideAndDisallowShowingAutomatically();
}

void RenderWidgetHostViewAndroid::SetTextHandlesTemporarilyHidden(bool hidden) {
  if (touch_selection_controller_)
    touch_selection_controller_->SetTemporarilyHidden(hidden);
}

SkColor RenderWidgetHostViewAndroid::GetCachedBackgroundColor() const {
  return cached_background_color_;
}

void RenderWidgetHostViewAndroid::SetIsInVR(bool is_in_vr) {
  is_in_vr_ = is_in_vr;
}

bool RenderWidgetHostViewAndroid::IsInVR() const {
  return is_in_vr_;
}

void RenderWidgetHostViewAndroid::DidOverscroll(
    const ui::DidOverscrollParams& params) {
  if (sync_compositor_)
    sync_compositor_->DidOverscroll(params);

  if (!content_view_core_ || !is_showing_)
    return;

  if (overscroll_controller_)
    overscroll_controller_->OnOverscrolled(params);
}

void RenderWidgetHostViewAndroid::DidStopFlinging() {
  if (content_view_core_)
    content_view_core_->DidStopFlinging();
}

viz::FrameSinkId RenderWidgetHostViewAndroid::GetFrameSinkId() {
  if (!delegated_frame_host_)
    return viz::FrameSinkId();

  return delegated_frame_host_->GetFrameSinkId();
}

void RenderWidgetHostViewAndroid::SetContentViewCore(
    ContentViewCore* content_view_core) {
  DCHECK(!content_view_core || !content_view_core_ ||
         (content_view_core_ == content_view_core));
  StopObservingRootWindow();

  bool resize = false;
  if (content_view_core != content_view_core_) {
    touch_selection_controller_.reset();
    RunAckCallbacks();
    // TODO(yusufo) : Get rid of the below conditions and have a better handling
    // for resizing after crbug.com/628302 is handled.
    bool is_size_initialized = !content_view_core
        || content_view_core->GetViewportSizeDip().width() != 0
        || content_view_core->GetViewportSizeDip().height() != 0;
    if (content_view_core_ || is_size_initialized)
      resize = true;
    if (content_view_core_) {
      content_view_core_->RemoveObserver(this);
      view_.RemoveObserver(this);
      view_.RemoveFromParent();
      view_.GetLayer()->RemoveFromParent();
    }
    if (content_view_core) {
      content_view_core->AddObserver(this);
      view_.AddObserver(this);
      ui::ViewAndroid* parent_view = content_view_core->GetViewAndroid();
      parent_view->AddChild(&view_);
      parent_view->GetLayer()->AddChild(view_.GetLayer());
    }
    content_view_core_ = content_view_core;
  }

  if (!content_view_core_) {
    sync_compositor_.reset();
    return;
  }

  if (is_showing_ && view_.GetWindowAndroid())
    StartObservingRootWindow();

  if (resize)
    WasResized();

  if (!touch_selection_controller_) {
    ui::TouchSelectionControllerClient* client =
        touch_selection_controller_client_manager_.get();
    if (touch_selection_controller_client_for_test_)
      client = touch_selection_controller_client_for_test_.get();

    touch_selection_controller_ =
        CreateSelectionController(client, content_view_core_);
  }

  if (content_view_core_)
    CreateOverscrollControllerIfPossible();
}

void RenderWidgetHostViewAndroid::RunAckCallbacks() {
  while (!ack_callbacks_.empty()) {
    ack_callbacks_.front().Run();
    ack_callbacks_.pop();
  }
}

TouchSelectionControllerClientManager*
RenderWidgetHostViewAndroid::GetTouchSelectionControllerClientManager() {
  return touch_selection_controller_client_manager_.get();
}

bool RenderWidgetHostViewAndroid::OnMouseEvent(
    const ui::MotionEventAndroid& event) {
  RecordToolTypeForActionDown(event);
  SendMouseEvent(event, event.GetActionButton());
  return true;
}

bool RenderWidgetHostViewAndroid::OnMouseWheelEvent(
    const ui::MotionEventAndroid& event) {
  SendMouseWheelEvent(WebMouseWheelEventBuilder::Build(
      event.ticks_x(), event.ticks_y(), event.GetTickMultiplier(),
      event.time_sec(), event.GetX(0), event.GetY(0)));
  return true;
}

void RenderWidgetHostViewAndroid::OnGestureEvent(
    const ui::GestureEventData& gesture) {
  blink::WebGestureEvent web_gesture =
      ui::CreateWebGestureEventFromGestureEventData(gesture);
  // TODO(jdduke): Remove this workaround after Android fixes UiAutomator to
  // stop providing shift meta values to synthetic MotionEvents. This prevents
  // unintended shift+click interpretation of all accessibility clicks.
  // See crbug.com/443247.
  if (web_gesture.GetType() == blink::WebInputEvent::kGestureTap &&
      web_gesture.GetModifiers() == blink::WebInputEvent::kShiftKey) {
    web_gesture.SetModifiers(blink::WebInputEvent::kNoModifiers);
  }
  SendGestureEvent(web_gesture);
}

void RenderWidgetHostViewAndroid::OnPhysicalBackingSizeChanged() {
  EvictFrameIfNecessary();
  WasResized();
}

void RenderWidgetHostViewAndroid::OnContentViewCoreDestroyed() {
  SetContentViewCore(NULL);
  overscroll_controller_.reset();
}

void RenderWidgetHostViewAndroid::OnRootWindowVisibilityChanged(bool visible) {
  TRACE_EVENT1("browser",
               "RenderWidgetHostViewAndroid::OnRootWindowVisibilityChanged",
               "visible", visible);
  DCHECK(observing_root_window_);
  if (is_window_visible_ == visible)
    return;

  is_window_visible_ = visible;

  if (visible)
    ShowInternal();
  else
    HideInternal();
}

void RenderWidgetHostViewAndroid::OnAttachedToWindow() {
  if (!content_view_core_)
    return;

  if (is_showing_)
    StartObservingRootWindow();
  DCHECK(view_.GetWindowAndroid());
  if (view_.GetWindowAndroid()->GetCompositor())
    OnAttachCompositor();
}

void RenderWidgetHostViewAndroid::OnDetachedFromWindow() {
  StopObservingRootWindow();
  OnDetachCompositor();
}

void RenderWidgetHostViewAndroid::OnAttachCompositor() {
  DCHECK(content_view_core_);
  CreateOverscrollControllerIfPossible();
  if (observing_root_window_) {
    ui::WindowAndroidCompositor* compositor =
        view_.GetWindowAndroid()->GetCompositor();
    delegated_frame_host_->AttachToCompositor(compositor);
  }
}

void RenderWidgetHostViewAndroid::OnDetachCompositor() {
  DCHECK(content_view_core_);
  DCHECK(using_browser_compositor_);
  RunAckCallbacks();
  overscroll_controller_.reset();
  delegated_frame_host_->DetachFromCompositor();
}

void RenderWidgetHostViewAndroid::OnBeginFrame(
    const viz::BeginFrameArgs& args) {
  TRACE_EVENT0("cc,benchmark", "RenderWidgetHostViewAndroid::OnBeginFrame");
  if (!host_) {
    OnDidNotProduceFrame(
        viz::BeginFrameAck(args.source_id, args.sequence_number, false));
    return;
  }

  // In sync mode, we disregard missed frame args to ensure that
  // SynchronousCompositorBrowserFilter::SyncStateAfterVSync will be called
  // during WindowAndroid::WindowBeginFrameSource::OnVSync() observer iteration.
  if (sync_compositor_ && args.type == viz::BeginFrameArgs::MISSED) {
    OnDidNotProduceFrame(
        viz::BeginFrameAck(args.source_id, args.sequence_number, false));
    return;
  }

  // Update |last_begin_frame_args_| before handling
  // |outstanding_begin_frame_requests_| to prevent the BeginFrameSource from
  // sending the same MISSED args in infinite recursion.
  last_begin_frame_args_ = args;

  if ((outstanding_begin_frame_requests_ & BEGIN_FRAME) ||
      (outstanding_begin_frame_requests_ & PERSISTENT_BEGIN_FRAME)) {
    ClearBeginFrameRequest(BEGIN_FRAME);
    SendBeginFrame(args);
  } else {
    OnDidNotProduceFrame(
        viz::BeginFrameAck(args.source_id, args.sequence_number, false));
  }
}

const viz::BeginFrameArgs& RenderWidgetHostViewAndroid::LastUsedBeginFrameArgs()
    const {
  return last_begin_frame_args_;
}

void RenderWidgetHostViewAndroid::SendBeginFramePaused() {
  bool paused = begin_frame_paused_ || !observing_root_window_;

  if (!using_browser_compositor_) {
    if (host_) {
      host_->Send(
          new ViewMsg_SetBeginFramePaused(host_->GetRoutingID(), paused));
    }
  } else if (renderer_compositor_frame_sink_) {
    renderer_compositor_frame_sink_->OnBeginFramePausedChanged(paused);
  }
}

void RenderWidgetHostViewAndroid::OnBeginFrameSourcePausedChanged(bool paused) {
  if (paused != begin_frame_paused_) {
    begin_frame_paused_ = paused;
    SendBeginFramePaused();
  }
}

void RenderWidgetHostViewAndroid::OnAnimate(base::TimeTicks begin_frame_time) {
  if (Animate(begin_frame_time))
    SetNeedsAnimate();
}

void RenderWidgetHostViewAndroid::OnActivityStopped() {
  TRACE_EVENT0("browser", "RenderWidgetHostViewAndroid::OnActivityStopped");
  DCHECK(observing_root_window_);
  is_window_activity_started_ = false;
  HideInternal();
}

void RenderWidgetHostViewAndroid::OnActivityStarted() {
  TRACE_EVENT0("browser", "RenderWidgetHostViewAndroid::OnActivityStarted");
  DCHECK(observing_root_window_);
  is_window_activity_started_ = true;
  ShowInternal();
}

void RenderWidgetHostViewAndroid::OnLostResources() {
  DestroyDelegatedContent();
  DCHECK(ack_callbacks_.empty());
}

void RenderWidgetHostViewAndroid::OnStylusSelectBegin(float x0,
                                                      float y0,
                                                      float x1,
                                                      float y1) {
  SelectBetweenCoordinates(gfx::PointF(x0, y0), gfx::PointF(x1, y1));
}

void RenderWidgetHostViewAndroid::OnStylusSelectUpdate(float x, float y) {
  MoveRangeSelectionExtent(gfx::PointF(x, y));
}

void RenderWidgetHostViewAndroid::OnStylusSelectEnd(float x, float y) {
  ShowContextMenuAtPoint(gfx::Point(x, y), ui::MENU_SOURCE_STYLUS);
}

void RenderWidgetHostViewAndroid::OnStylusSelectTap(base::TimeTicks time,
                                                    float x,
                                                    float y) {
  // Treat the stylus tap as a long press, activating either a word selection or
  // context menu depending on the targetted content.
  blink::WebGestureEvent long_press = WebGestureEventBuilder::Build(
      blink::WebInputEvent::kGestureLongPress,
      (time - base::TimeTicks()).InSecondsF(), x, y);
  SendGestureEvent(long_press);
}

void RenderWidgetHostViewAndroid::ComputeEventLatencyOSTouchHistograms(
      const ui::MotionEvent& event) {
  base::TimeTicks event_time = event.GetEventTime();
  base::TimeDelta delta = base::TimeTicks::Now() - event_time;
  switch (event.GetAction()) {
    case ui::MotionEvent::ACTION_DOWN:
    case ui::MotionEvent::ACTION_POINTER_DOWN:
      UMA_HISTOGRAM_CUSTOM_COUNTS("Event.Latency.OS.TOUCH_PRESSED",
                                  delta.InMicroseconds(), 1, 1000000, 50);
      return;
    case ui::MotionEvent::ACTION_MOVE:
      UMA_HISTOGRAM_CUSTOM_COUNTS("Event.Latency.OS.TOUCH_MOVED",
                                  delta.InMicroseconds(), 1, 1000000, 50);
      return;
    case ui::MotionEvent::ACTION_UP:
    case ui::MotionEvent::ACTION_POINTER_UP:
      UMA_HISTOGRAM_CUSTOM_COUNTS("Event.Latency.OS.TOUCH_RELEASED",
                                  delta.InMicroseconds(), 1, 1000000, 50);
    default:
      return;
  }
}

void RenderWidgetHostViewAndroid::CreateOverscrollControllerIfPossible() {
  // an OverscrollController is already set
  if (overscroll_controller_)
    return;

  RenderWidgetHostDelegate* delegate = host_->delegate();
  if (!delegate)
    return;

  RenderViewHostDelegateView* delegate_view = delegate->GetDelegateView();
  // render_widget_host_unittest.cc uses an object called
  // MockRenderWidgetHostDelegate that does not have a DelegateView
  if (!delegate_view)
    return;

  ui::OverscrollRefreshHandler* overscroll_refresh_handler =
      delegate_view->GetOverscrollRefreshHandler();
  if (!overscroll_refresh_handler)
    return;

  if (!content_view_core_)
    return;

  // If window_android is null here, this is bad because we don't listen for it
  // being set, so we won't be able to construct the OverscrollController at the
  // proper time.
  // TODO(rlanday): once we get WindowAndroid from ViewAndroid instead of
  // ContentViewCore, listen for WindowAndroid being set and create the
  // OverscrollController.
  ui::WindowAndroid* window_android = content_view_core_->GetWindowAndroid();
  if (!window_android)
    return;

  ui::WindowAndroidCompositor* compositor = window_android->GetCompositor();
  if (!compositor)
    return;

  overscroll_controller_ = base::MakeUnique<OverscrollControllerAndroid>(
      overscroll_refresh_handler, compositor, view_.GetDipScale());
}

void RenderWidgetHostViewAndroid::SetOverscrollControllerForTesting(
    ui::OverscrollRefreshHandler* overscroll_refresh_handler) {
  overscroll_controller_ = base::MakeUnique<OverscrollControllerAndroid>(
      overscroll_refresh_handler, view_.GetWindowAndroid()->GetCompositor(),
      view_.GetDipScale());
}

}  // namespace content