root/content/renderer/gpu/render_widget_compositor.cc

DEFINITIONS

1. GetSwitchValueAsInt
2. Create
3. widget_
4. GetInputHandler
5. SetSuppressScheduleComposite
6. BeginMainFrameRequested
7. UpdateAnimations
8. Composite
9. SetNeedsDisplayOnAllLayers
10. SetRasterizeOnlyVisibleContent
11. UpdateTopControlsState
12. SetOverdrawBottomHeight
13. SetNeedsRedrawRect
14. SetNeedsForcedRedraw
15. CreateLatencyInfoSwapPromiseMonitor
16. GetLayerTreeId
17. NotifyInputThrottledUntilCommit
18. GetRootLayer
19. ScheduleMicroBenchmark
20. Initialize
21. setSurfaceReady
22. setRootLayer
23. clearRootLayer
24. setViewportSize
25. layoutViewportSize
26. deviceViewportSize
27. adjustEventPointForPinchZoom
28. setDeviceScaleFactor
29. deviceScaleFactor
30. setBackgroundColor
31. setHasTransparentBackground
32. setOverhangBitmap
33. setVisible
34. setPageScaleFactorAndLimits
35. startPageScaleAnimation
36. setNeedsAnimate
37. commitRequested
38. didStopFlinging
39. registerForAnimations
40. registerViewportLayers
41. clearViewportLayers
42. compositeAndReadback
43. finishAllRendering
44. setDeferCommits
45. setShowFPSCounter
46. setShowPaintRects
47. setShowDebugBorders
48. setContinuousPaintingEnabled
49. setShowScrollBottleneckRects
50. WillBeginMainFrame
51. DidBeginMainFrame
52. Animate
53. Layout
54. ApplyScrollAndScale
55. CreateOutputSurface
56. DidInitializeOutputSurface
57. WillCommit
58. DidCommit
59. DidCommitAndDrawFrame
60. DidCompleteSwapBuffers
61. OffscreenContextProvider
62. ScheduleComposite
63. ScheduleAnimation
64. DidPostSwapBuffers
65. DidAbortSwapBuffers
66. RateLimitSharedMainThreadContext

// Copyright (c) 2013 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/renderer/gpu/render_widget_compositor.h"

#include <limits>
#include <string>

#if defined(OS_ANDROID)
#include "base/android/sys_utils.h"
#endif

#include "base/command_line.h"
#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "base/synchronization/lock.h"
#include "base/time/time.h"
#include "base/values.h"
#include "cc/base/latency_info_swap_promise.h"
#include "cc/base/latency_info_swap_promise_monitor.h"
#include "cc/base/switches.h"
#include "cc/debug/layer_tree_debug_state.h"
#include "cc/debug/micro_benchmark.h"
#include "cc/layers/layer.h"
#include "cc/trees/layer_tree_host.h"
#include "content/child/child_shared_bitmap_manager.h"
#include "content/common/content_switches_internal.h"
#include "content/common/gpu/client/context_provider_command_buffer.h"
#include "content/public/common/content_switches.h"
#include "content/renderer/input/input_handler_manager.h"
#include "content/renderer/render_thread_impl.h"
#include "gpu/command_buffer/client/gles2_interface.h"
#include "third_party/WebKit/public/platform/WebSize.h"
#include "third_party/WebKit/public/web/WebWidget.h"
#include "ui/gl/gl_switches.h"
#include "ui/native_theme/native_theme_switches.h"
#include "webkit/renderer/compositor_bindings/web_layer_impl.h"

namespace base {
class Value;
}

namespace cc {
class Layer;
}

using blink::WebFloatPoint;
using blink::WebSize;
using blink::WebRect;

namespace content {
namespace {

bool GetSwitchValueAsInt(
    const CommandLine& command_line,
    const std::string& switch_string,
    int min_value,
    int max_value,
    int* result) {
  std::string string_value = command_line.GetSwitchValueASCII(switch_string);
  int int_value;
  if (base::StringToInt(string_value, &int_value) &&
      int_value >= min_value && int_value <= max_value) {
    *result = int_value;
    return true;
  } else {
    LOG(WARNING) << "Failed to parse switch " << switch_string  << ": " <<
        string_value;
    return false;
  }
}

}  // namespace

// static
scoped_ptr<RenderWidgetCompositor> RenderWidgetCompositor::Create(
    RenderWidget* widget,
    bool threaded) {
  scoped_ptr<RenderWidgetCompositor> compositor(
      new RenderWidgetCompositor(widget, threaded));

  CommandLine* cmd = CommandLine::ForCurrentProcess();

  cc::LayerTreeSettings settings;

  // For web contents, layer transforms should scale up the contents of layers
  // to keep content always crisp when possible.
  settings.layer_transforms_should_scale_layer_contents = true;

  settings.throttle_frame_production =
      !cmd->HasSwitch(switches::kDisableGpuVsync);
  settings.begin_impl_frame_scheduling_enabled =
      cmd->HasSwitch(switches::kEnableBeginFrameScheduling);
  settings.main_frame_before_activation_enabled =
      cmd->HasSwitch(cc::switches::kEnableMainFrameBeforeActivation) &&
      !cmd->HasSwitch(cc::switches::kDisableMainFrameBeforeActivation);
  settings.main_frame_before_draw_enabled =
      !cmd->HasSwitch(cc::switches::kDisableMainFrameBeforeDraw);
  settings.using_synchronous_renderer_compositor =
      widget->UsingSynchronousRendererCompositor();
  settings.accelerated_animation_enabled =
      !cmd->HasSwitch(cc::switches::kDisableThreadedAnimation);
  settings.touch_hit_testing =
      !cmd->HasSwitch(cc::switches::kDisableCompositorTouchHitTesting) &&
      !cmd->HasSwitch(switches::kEnableBleedingEdgeRenderingFastPaths);

  int default_tile_width = settings.default_tile_size.width();
  if (cmd->HasSwitch(switches::kDefaultTileWidth)) {
    GetSwitchValueAsInt(*cmd, switches::kDefaultTileWidth, 1,
                        std::numeric_limits<int>::max(), &default_tile_width);
  }
  int default_tile_height = settings.default_tile_size.height();
  if (cmd->HasSwitch(switches::kDefaultTileHeight)) {
    GetSwitchValueAsInt(*cmd, switches::kDefaultTileHeight, 1,
                        std::numeric_limits<int>::max(), &default_tile_height);
  }
  settings.default_tile_size = gfx::Size(default_tile_width,
                                         default_tile_height);

  int max_untiled_layer_width = settings.max_untiled_layer_size.width();
  if (cmd->HasSwitch(switches::kMaxUntiledLayerWidth)) {
    GetSwitchValueAsInt(*cmd, switches::kMaxUntiledLayerWidth, 1,
                        std::numeric_limits<int>::max(),
                        &max_untiled_layer_width);
  }
  int max_untiled_layer_height = settings.max_untiled_layer_size.height();
  if (cmd->HasSwitch(switches::kMaxUntiledLayerHeight)) {
    GetSwitchValueAsInt(*cmd, switches::kMaxUntiledLayerHeight, 1,
                        std::numeric_limits<int>::max(),
                        &max_untiled_layer_height);
  }

  settings.max_untiled_layer_size = gfx::Size(max_untiled_layer_width,
                                           max_untiled_layer_height);

  settings.impl_side_painting =
      RenderThreadImpl::current()->is_impl_side_painting_enabled();
  if (RenderThreadImpl::current()->is_gpu_rasterization_forced())
    settings.rasterization_site = cc::LayerTreeSettings::GpuRasterization;
  else if (RenderThreadImpl::current()->is_gpu_rasterization_enabled())
    settings.rasterization_site = cc::LayerTreeSettings::HybridRasterization;
  else
    settings.rasterization_site = cc::LayerTreeSettings::CpuRasterization;
  settings.create_low_res_tiling =
      RenderThreadImpl::current()->is_low_res_tiling_enabled();

  settings.calculate_top_controls_position =
      cmd->HasSwitch(cc::switches::kEnableTopControlsPositionCalculation);
  if (cmd->HasSwitch(cc::switches::kTopControlsHeight)) {
    std::string controls_height_str =
        cmd->GetSwitchValueASCII(cc::switches::kTopControlsHeight);
    double controls_height;
    if (base::StringToDouble(controls_height_str, &controls_height) &&
        controls_height > 0)
      settings.top_controls_height = controls_height;
  }

  if (settings.calculate_top_controls_position &&
      settings.top_controls_height <= 0) {
    DCHECK(false)
        << "Top controls repositioning enabled without valid height set.";
    settings.calculate_top_controls_position = false;
  }

  if (cmd->HasSwitch(cc::switches::kTopControlsShowThreshold)) {
      std::string top_threshold_str =
          cmd->GetSwitchValueASCII(cc::switches::kTopControlsShowThreshold);
      double show_threshold;
      if (base::StringToDouble(top_threshold_str, &show_threshold) &&
          show_threshold >= 0.f && show_threshold <= 1.f)
        settings.top_controls_show_threshold = show_threshold;
  }

  if (cmd->HasSwitch(cc::switches::kTopControlsHideThreshold)) {
      std::string top_threshold_str =
          cmd->GetSwitchValueASCII(cc::switches::kTopControlsHideThreshold);
      double hide_threshold;
      if (base::StringToDouble(top_threshold_str, &hide_threshold) &&
          hide_threshold >= 0.f && hide_threshold <= 1.f)
        settings.top_controls_hide_threshold = hide_threshold;
  }

  settings.can_use_lcd_text =
      RenderThreadImpl::current()->is_lcd_text_enabled();
  settings.use_pinch_virtual_viewport =
      cmd->HasSwitch(cc::switches::kEnablePinchVirtualViewport);
  settings.allow_antialiasing &=
      !cmd->HasSwitch(cc::switches::kDisableCompositedAntialiasing);

  // These flags should be mirrored by UI versions in ui/compositor/.
  settings.initial_debug_state.show_debug_borders =
      cmd->HasSwitch(cc::switches::kShowCompositedLayerBorders);
  settings.initial_debug_state.show_fps_counter =
      cmd->HasSwitch(cc::switches::kShowFPSCounter);
  settings.initial_debug_state.show_layer_animation_bounds_rects =
      cmd->HasSwitch(cc::switches::kShowLayerAnimationBounds);
  settings.initial_debug_state.show_paint_rects =
      cmd->HasSwitch(switches::kShowPaintRects);
  settings.initial_debug_state.show_property_changed_rects =
      cmd->HasSwitch(cc::switches::kShowPropertyChangedRects);
  settings.initial_debug_state.show_surface_damage_rects =
      cmd->HasSwitch(cc::switches::kShowSurfaceDamageRects);
  settings.initial_debug_state.show_screen_space_rects =
      cmd->HasSwitch(cc::switches::kShowScreenSpaceRects);
  settings.initial_debug_state.show_replica_screen_space_rects =
      cmd->HasSwitch(cc::switches::kShowReplicaScreenSpaceRects);
  settings.initial_debug_state.show_occluding_rects =
      cmd->HasSwitch(cc::switches::kShowOccludingRects);
  settings.initial_debug_state.show_non_occluding_rects =
      cmd->HasSwitch(cc::switches::kShowNonOccludingRects);

  settings.initial_debug_state.SetRecordRenderingStats(
      cmd->HasSwitch(cc::switches::kEnableGpuBenchmarking));

  if (cmd->HasSwitch(cc::switches::kSlowDownRasterScaleFactor)) {
    const int kMinSlowDownScaleFactor = 0;
    const int kMaxSlowDownScaleFactor = INT_MAX;
    GetSwitchValueAsInt(
        *cmd,
        cc::switches::kSlowDownRasterScaleFactor,
        kMinSlowDownScaleFactor,
        kMaxSlowDownScaleFactor,
        &settings.initial_debug_state.slow_down_raster_scale_factor);
  }

  if (cmd->HasSwitch(cc::switches::kMaxTilesForInterestArea)) {
    int max_tiles_for_interest_area;
    if (GetSwitchValueAsInt(*cmd,
                            cc::switches::kMaxTilesForInterestArea,
                            1, std::numeric_limits<int>::max(),
                            &max_tiles_for_interest_area))
      settings.max_tiles_for_interest_area = max_tiles_for_interest_area;
  }

  if (cmd->HasSwitch(cc::switches::kMaxUnusedResourceMemoryUsagePercentage)) {
    int max_unused_resource_memory_percentage;
    if (GetSwitchValueAsInt(
            *cmd,
            cc::switches::kMaxUnusedResourceMemoryUsagePercentage,
            0, 100,
            &max_unused_resource_memory_percentage)) {
      settings.max_unused_resource_memory_percentage =
          max_unused_resource_memory_percentage;
    }
  }

  settings.strict_layer_property_change_checking =
      cmd->HasSwitch(cc::switches::kStrictLayerPropertyChangeChecking);

  settings.use_map_image = RenderThreadImpl::current()->is_map_image_enabled();

#if defined(OS_ANDROID)
  settings.max_partial_texture_updates = 0;
  settings.scrollbar_animator = cc::LayerTreeSettings::LinearFade;
  settings.solid_color_scrollbar_color =
      (widget->UsingSynchronousRendererCompositor())  // It is Android Webview.
          ? SK_ColorTRANSPARENT
          : SkColorSetARGB(128, 128, 128, 128);
  settings.highp_threshold_min = 2048;
  // Android WebView handles root layer flings itself.
  settings.ignore_root_layer_flings =
      widget->UsingSynchronousRendererCompositor();
  // RGBA_4444 textures are only enabled for low end devices
  // and are disabled for Android WebView as it doesn't support the format.
  settings.use_rgba_4444_textures =
      base::android::SysUtils::IsLowEndDevice() &&
      !widget->UsingSynchronousRendererCompositor();
  if (widget->UsingSynchronousRendererCompositor()) {
    // TODO(boliu): Set this ratio for Webview.
  } else if (base::android::SysUtils::IsLowEndDevice()) {
    // On low-end we want to be very carefull about killing other
    // apps. So initially we use 50% more memory to avoid flickering
    // or raster-on-demand.
    settings.max_memory_for_prepaint_percentage = 67;
  } else {
    // On other devices we have increased memory excessively to avoid
    // raster-on-demand already, so now we reserve 50% _only_ to avoid
    // raster-on-demand, and use 50% of the memory otherwise.
    settings.max_memory_for_prepaint_percentage = 50;
  }
  // Webview does not own the surface so should not clear it.
  settings.should_clear_root_render_pass =
      !widget->UsingSynchronousRendererCompositor();

#elif !defined(OS_MACOSX)
  if (ui::IsOverlayScrollbarEnabled()) {
    settings.scrollbar_animator = cc::LayerTreeSettings::Thinning;
    settings.solid_color_scrollbar_color = SkColorSetARGB(128, 128, 128, 128);
  } else if (cmd->HasSwitch(cc::switches::kEnablePinchVirtualViewport)) {
    settings.scrollbar_animator = cc::LayerTreeSettings::LinearFade;
    settings.solid_color_scrollbar_color = SkColorSetARGB(128, 128, 128, 128);
  }
#endif

  compositor->Initialize(settings);

  return compositor.Pass();
}

RenderWidgetCompositor::RenderWidgetCompositor(RenderWidget* widget,
                                               bool threaded)
    : threaded_(threaded),
      suppress_schedule_composite_(false),
      widget_(widget) {
}

RenderWidgetCompositor::~RenderWidgetCompositor() {}

const base::WeakPtr<cc::InputHandler>&
RenderWidgetCompositor::GetInputHandler() {
  return layer_tree_host_->GetInputHandler();
}

void RenderWidgetCompositor::SetSuppressScheduleComposite(bool suppress) {
  if (suppress_schedule_composite_ == suppress)
    return;

  if (suppress)
    TRACE_EVENT_ASYNC_BEGIN0("gpu",
        "RenderWidgetCompositor::SetSuppressScheduleComposite", this);
  else
    TRACE_EVENT_ASYNC_END0("gpu",
        "RenderWidgetCompositor::SetSuppressScheduleComposite", this);
  suppress_schedule_composite_ = suppress;
}

bool RenderWidgetCompositor::BeginMainFrameRequested() const {
  return layer_tree_host_->BeginMainFrameRequested();
}

void RenderWidgetCompositor::UpdateAnimations(base::TimeTicks time) {
  layer_tree_host_->UpdateClientAnimations(time);
}

void RenderWidgetCompositor::Composite(base::TimeTicks frame_begin_time) {
  layer_tree_host_->Composite(frame_begin_time);
}

void RenderWidgetCompositor::SetNeedsDisplayOnAllLayers() {
  layer_tree_host_->SetNeedsDisplayOnAllLayers();
}

void RenderWidgetCompositor::SetRasterizeOnlyVisibleContent() {
  cc::LayerTreeDebugState current = layer_tree_host_->debug_state();
  current.rasterize_only_visible_content = true;
  layer_tree_host_->SetDebugState(current);
}

void RenderWidgetCompositor::UpdateTopControlsState(
    cc::TopControlsState constraints,
    cc::TopControlsState current,
    bool animate) {
  layer_tree_host_->UpdateTopControlsState(constraints,
                                           current,
                                           animate);
}

void RenderWidgetCompositor::SetOverdrawBottomHeight(
    float overdraw_bottom_height) {
  layer_tree_host_->SetOverdrawBottomHeight(overdraw_bottom_height);
}

void RenderWidgetCompositor::SetNeedsRedrawRect(gfx::Rect damage_rect) {
  layer_tree_host_->SetNeedsRedrawRect(damage_rect);
}

void RenderWidgetCompositor::SetNeedsForcedRedraw() {
  layer_tree_host_->SetNextCommitForcesRedraw();
  setNeedsAnimate();
}

scoped_ptr<cc::SwapPromiseMonitor>
RenderWidgetCompositor::CreateLatencyInfoSwapPromiseMonitor(
    ui::LatencyInfo* latency) {
  return scoped_ptr<cc::SwapPromiseMonitor>(
      new cc::LatencyInfoSwapPromiseMonitor(
          latency, layer_tree_host_.get(), NULL));
}

int RenderWidgetCompositor::GetLayerTreeId() const {
  return layer_tree_host_->id();
}

void RenderWidgetCompositor::NotifyInputThrottledUntilCommit() {
  layer_tree_host_->NotifyInputThrottledUntilCommit();
}

const cc::Layer* RenderWidgetCompositor::GetRootLayer() const {
  return layer_tree_host_->root_layer();
}

bool RenderWidgetCompositor::ScheduleMicroBenchmark(
    const std::string& name,
    scoped_ptr<base::Value> value,
    const base::Callback<void(scoped_ptr<base::Value>)>& callback) {
  return layer_tree_host_->ScheduleMicroBenchmark(name, value.Pass(), callback);
}

void RenderWidgetCompositor::Initialize(cc::LayerTreeSettings settings) {
  scoped_refptr<base::MessageLoopProxy> compositor_message_loop_proxy =
      RenderThreadImpl::current()->compositor_message_loop_proxy();
  if (compositor_message_loop_proxy.get()) {
    layer_tree_host_ = cc::LayerTreeHost::CreateThreaded(
        this,
        ChildThread::current()->shared_bitmap_manager(),
        settings,
        compositor_message_loop_proxy);
  } else {
    layer_tree_host_ = cc::LayerTreeHost::CreateSingleThreaded(
        this, this, ChildThread::current()->shared_bitmap_manager(), settings);
  }
  DCHECK(layer_tree_host_);
}

void RenderWidgetCompositor::setSurfaceReady() {
  layer_tree_host_->SetLayerTreeHostClientReady();
}

void RenderWidgetCompositor::setRootLayer(const blink::WebLayer& layer) {
  layer_tree_host_->SetRootLayer(
      static_cast<const webkit::WebLayerImpl*>(&layer)->layer());
}

void RenderWidgetCompositor::clearRootLayer() {
  layer_tree_host_->SetRootLayer(scoped_refptr<cc::Layer>());
}

void RenderWidgetCompositor::setViewportSize(
    const WebSize&,
    const WebSize& device_viewport_size) {
  layer_tree_host_->SetViewportSize(device_viewport_size);
}

WebSize RenderWidgetCompositor::layoutViewportSize() const {
  return layer_tree_host_->device_viewport_size();
}

WebSize RenderWidgetCompositor::deviceViewportSize() const {
  return layer_tree_host_->device_viewport_size();
}

WebFloatPoint RenderWidgetCompositor::adjustEventPointForPinchZoom(
    const WebFloatPoint& point) const {
  return point;
}

void RenderWidgetCompositor::setDeviceScaleFactor(float device_scale) {
  layer_tree_host_->SetDeviceScaleFactor(device_scale);
}

float RenderWidgetCompositor::deviceScaleFactor() const {
  return layer_tree_host_->device_scale_factor();
}

void RenderWidgetCompositor::setBackgroundColor(blink::WebColor color) {
  layer_tree_host_->set_background_color(color);
}

void RenderWidgetCompositor::setHasTransparentBackground(bool transparent) {
  layer_tree_host_->set_has_transparent_background(transparent);
}

void RenderWidgetCompositor::setOverhangBitmap(const SkBitmap& bitmap) {
  layer_tree_host_->SetOverhangBitmap(bitmap);
}

void RenderWidgetCompositor::setVisible(bool visible) {
  layer_tree_host_->SetVisible(visible);
}

void RenderWidgetCompositor::setPageScaleFactorAndLimits(
    float page_scale_factor, float minimum, float maximum) {
  layer_tree_host_->SetPageScaleFactorAndLimits(
      page_scale_factor, minimum, maximum);
}

void RenderWidgetCompositor::startPageScaleAnimation(
    const blink::WebPoint& destination,
    bool use_anchor,
    float new_page_scale,
    double duration_sec) {
  base::TimeDelta duration = base::TimeDelta::FromMicroseconds(
      duration_sec * base::Time::kMicrosecondsPerSecond);
  layer_tree_host_->StartPageScaleAnimation(
      gfx::Vector2d(destination.x, destination.y),
      use_anchor,
      new_page_scale,
      duration);
}

void RenderWidgetCompositor::setNeedsAnimate() {
  layer_tree_host_->SetNeedsAnimate();
}

bool RenderWidgetCompositor::commitRequested() const {
  return layer_tree_host_->CommitRequested();
}

void RenderWidgetCompositor::didStopFlinging() {
  layer_tree_host_->DidStopFlinging();
}

void RenderWidgetCompositor::registerForAnimations(blink::WebLayer* layer) {
  cc::Layer* cc_layer = static_cast<webkit::WebLayerImpl*>(layer)->layer();
  cc_layer->layer_animation_controller()->SetAnimationRegistrar(
      layer_tree_host_->animation_registrar());
}

void RenderWidgetCompositor::registerViewportLayers(
    const blink::WebLayer* pageScaleLayer,
    const blink::WebLayer* innerViewportScrollLayer,
    const blink::WebLayer* outerViewportScrollLayer) {
  layer_tree_host_->RegisterViewportLayers(
      static_cast<const webkit::WebLayerImpl*>(pageScaleLayer)->layer(),
      static_cast<const webkit::WebLayerImpl*>(innerViewportScrollLayer)
          ->layer(),
      // The outer viewport layer will only exist when using pinch virtual
      // viewports.
      outerViewportScrollLayer ? static_cast<const webkit::WebLayerImpl*>(
                                     outerViewportScrollLayer)->layer()
                               : NULL);
}

void RenderWidgetCompositor::clearViewportLayers() {
  layer_tree_host_->RegisterViewportLayers(scoped_refptr<cc::Layer>(),
                                           scoped_refptr<cc::Layer>(),
                                           scoped_refptr<cc::Layer>());
}

bool RenderWidgetCompositor::compositeAndReadback(
    void *pixels, const WebRect& rect_in_device_viewport) {
  return layer_tree_host_->CompositeAndReadback(pixels,
                                                rect_in_device_viewport);
}

void RenderWidgetCompositor::finishAllRendering() {
  layer_tree_host_->FinishAllRendering();
}

void RenderWidgetCompositor::setDeferCommits(bool defer_commits) {
  layer_tree_host_->SetDeferCommits(defer_commits);
}

void RenderWidgetCompositor::setShowFPSCounter(bool show) {
  cc::LayerTreeDebugState debug_state = layer_tree_host_->debug_state();
  debug_state.show_fps_counter = show;
  layer_tree_host_->SetDebugState(debug_state);
}

void RenderWidgetCompositor::setShowPaintRects(bool show) {
  cc::LayerTreeDebugState debug_state = layer_tree_host_->debug_state();
  debug_state.show_paint_rects = show;
  layer_tree_host_->SetDebugState(debug_state);
}

void RenderWidgetCompositor::setShowDebugBorders(bool show) {
  cc::LayerTreeDebugState debug_state = layer_tree_host_->debug_state();
  debug_state.show_debug_borders = show;
  layer_tree_host_->SetDebugState(debug_state);
}

void RenderWidgetCompositor::setContinuousPaintingEnabled(bool enabled) {
  cc::LayerTreeDebugState debug_state = layer_tree_host_->debug_state();
  debug_state.continuous_painting = enabled;
  layer_tree_host_->SetDebugState(debug_state);
}

void RenderWidgetCompositor::setShowScrollBottleneckRects(bool show) {
  cc::LayerTreeDebugState debug_state = layer_tree_host_->debug_state();
  debug_state.show_touch_event_handler_rects = show;
  debug_state.show_wheel_event_handler_rects = show;
  debug_state.show_non_fast_scrollable_rects = show;
  layer_tree_host_->SetDebugState(debug_state);
}

void RenderWidgetCompositor::WillBeginMainFrame(int frame_id) {
  widget_->InstrumentWillBeginFrame(frame_id);
  widget_->willBeginCompositorFrame();
}

void RenderWidgetCompositor::DidBeginMainFrame() {
  widget_->InstrumentDidBeginFrame();
}

void RenderWidgetCompositor::Animate(base::TimeTicks frame_begin_time) {
  widget_->webwidget()->animate(
      (frame_begin_time - base::TimeTicks()).InSecondsF());
}

void RenderWidgetCompositor::Layout() {
  widget_->webwidget()->layout();
}

void RenderWidgetCompositor::ApplyScrollAndScale(
    const gfx::Vector2d& scroll_delta,
    float page_scale) {
  widget_->webwidget()->applyScrollAndScale(scroll_delta, page_scale);
}

scoped_ptr<cc::OutputSurface> RenderWidgetCompositor::CreateOutputSurface(
    bool fallback) {
  return widget_->CreateOutputSurface(fallback);
}

void RenderWidgetCompositor::DidInitializeOutputSurface(bool success) {
  if (!success)
    widget_->webwidget()->didExitCompositingMode();
}

void RenderWidgetCompositor::WillCommit() {
  widget_->InstrumentWillComposite();
}

void RenderWidgetCompositor::DidCommit() {
  widget_->DidCommitCompositorFrame();
  widget_->didBecomeReadyForAdditionalInput();
}

void RenderWidgetCompositor::DidCommitAndDrawFrame() {
  widget_->didCommitAndDrawCompositorFrame();
}

void RenderWidgetCompositor::DidCompleteSwapBuffers() {
  widget_->didCompleteSwapBuffers();
  if (!threaded_)
    widget_->OnSwapBuffersComplete();
}

scoped_refptr<cc::ContextProvider>
RenderWidgetCompositor::OffscreenContextProvider() {
  return RenderThreadImpl::current()->OffscreenCompositorContextProvider();
}

void RenderWidgetCompositor::ScheduleComposite() {
  if (!suppress_schedule_composite_)
    widget_->scheduleComposite();
}

void RenderWidgetCompositor::ScheduleAnimation() {
  widget_->scheduleAnimation();
}

void RenderWidgetCompositor::DidPostSwapBuffers() {
  widget_->OnSwapBuffersPosted();
}

void RenderWidgetCompositor::DidAbortSwapBuffers() {
  widget_->OnSwapBuffersAborted();
}

void RenderWidgetCompositor::RateLimitSharedMainThreadContext() {
  cc::ContextProvider* provider =
      RenderThreadImpl::current()->SharedMainThreadContextProvider().get();
  provider->ContextGL()->RateLimitOffscreenContextCHROMIUM();
}

}  // namespace content