cc: Remove the LayerTreeHost abstraction.

cc/trees/layer_tree_host_in_process.cc

Index: cc/trees/layer_tree_host_in_process.cc
diff --git a/cc/trees/layer_tree_host_in_process.cc b/cc/trees/layer_tree_host_in_process.cc
deleted file mode 100644
index 22bee7611b2a866f0a37d6cfbc7911bd7f906a0d..0000000000000000000000000000000000000000
--- a/cc/trees/layer_tree_host_in_process.cc
+++ /dev/null
@@ -1,815 +0,0 @@
-// Copyright 2011 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 "cc/trees/layer_tree_host_in_process.h"
-
-#include <stddef.h>
-#include <stdint.h>
-
-#include <algorithm>
-#include <memory>
-#include <stack>
-#include <string>
-#include <unordered_map>
-
-#include "base/atomic_sequence_num.h"
-#include "base/bind.h"
-#include "base/command_line.h"
-#include "base/location.h"
-#include "base/memory/ptr_util.h"
-#include "base/metrics/histogram_macros.h"
-#include "base/numerics/safe_math.h"
-#include "base/single_thread_task_runner.h"
-#include "base/stl_util.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/strings/stringprintf.h"
-#include "base/threading/thread_task_runner_handle.h"
-#include "base/timer/elapsed_timer.h"
-#include "base/trace_event/trace_event.h"
-#include "base/trace_event/trace_event_argument.h"
-#include "cc/base/histograms.h"
-#include "cc/base/math_util.h"
-#include "cc/debug/devtools_instrumentation.h"
-#include "cc/debug/frame_viewer_instrumentation.h"
-#include "cc/debug/rendering_stats_instrumentation.h"
-#include "cc/input/layer_selection_bound.h"
-#include "cc/input/page_scale_animation.h"
-#include "cc/layers/heads_up_display_layer.h"
-#include "cc/layers/heads_up_display_layer_impl.h"
-#include "cc/layers/layer.h"
-#include "cc/layers/layer_iterator.h"
-#include "cc/layers/painted_scrollbar_layer.h"
-#include "cc/resources/ui_resource_manager.h"
-#include "cc/trees/draw_property_utils.h"
-#include "cc/trees/layer_tree_host_client.h"
-#include "cc/trees/layer_tree_host_common.h"
-#include "cc/trees/layer_tree_host_impl.h"
-#include "cc/trees/layer_tree_impl.h"
-#include "cc/trees/mutator_host.h"
-#include "cc/trees/property_tree_builder.h"
-#include "cc/trees/proxy_main.h"
-#include "cc/trees/single_thread_proxy.h"
-#include "cc/trees/swap_promise_manager.h"
-#include "cc/trees/tree_synchronizer.h"
-#include "ui/gfx/geometry/size_conversions.h"
-#include "ui/gfx/geometry/vector2d_conversions.h"
-
-namespace {
-static base::StaticAtomicSequenceNumber s_layer_tree_host_sequence_number;
-}
-
-namespace cc {
-
-LayerTreeHostInProcess::InitParams::InitParams() {}
-
-LayerTreeHostInProcess::InitParams::~InitParams() {}
-
-std::unique_ptr<LayerTreeHostInProcess> LayerTreeHostInProcess::CreateThreaded(
-    scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner,
-    InitParams* params) {
-  DCHECK(params->main_task_runner.get());
-  DCHECK(impl_task_runner.get());
-  DCHECK(params->settings);
-  std::unique_ptr<LayerTreeHostInProcess> layer_tree_host(
-      new LayerTreeHostInProcess(params, CompositorMode::THREADED));
-  layer_tree_host->InitializeThreaded(params->main_task_runner,
-                                      impl_task_runner);
-  return layer_tree_host;
-}
-
-std::unique_ptr<LayerTreeHostInProcess>
-LayerTreeHostInProcess::CreateSingleThreaded(
-    LayerTreeHostSingleThreadClient* single_thread_client,
-    InitParams* params) {
-  DCHECK(params->settings);
-  std::unique_ptr<LayerTreeHostInProcess> layer_tree_host(
-      new LayerTreeHostInProcess(params, CompositorMode::SINGLE_THREADED));
-  layer_tree_host->InitializeSingleThreaded(single_thread_client,
-                                            params->main_task_runner);
-  return layer_tree_host;
-}
-
-LayerTreeHostInProcess::LayerTreeHostInProcess(InitParams* params,
-                                               CompositorMode mode)
-    : LayerTreeHostInProcess(
-          params,
-          mode,
-          base::MakeUnique<LayerTree>(params->mutator_host, this)) {}
-
-LayerTreeHostInProcess::LayerTreeHostInProcess(
-    InitParams* params,
-    CompositorMode mode,
-    std::unique_ptr<LayerTree> layer_tree)
-    : micro_benchmark_controller_(this),
-      layer_tree_(std::move(layer_tree)),
-      compositor_mode_(mode),
-      ui_resource_manager_(base::MakeUnique<UIResourceManager>()),
-      client_(params->client),
-      source_frame_number_(0),
-      rendering_stats_instrumentation_(RenderingStatsInstrumentation::Create()),
-      settings_(*params->settings),
-      debug_state_(settings_.initial_debug_state),
-      visible_(false),
-      has_gpu_rasterization_trigger_(false),
-      content_is_suitable_for_gpu_rasterization_(true),
-      gpu_rasterization_histogram_recorded_(false),
-      did_complete_scale_animation_(false),
-      id_(s_layer_tree_host_sequence_number.GetNext() + 1),
-      task_graph_runner_(params->task_graph_runner),
-      image_worker_task_runner_(params->image_worker_task_runner) {
-  DCHECK(task_graph_runner_);
-  DCHECK(layer_tree_);
-
-  rendering_stats_instrumentation_->set_record_rendering_stats(
-      debug_state_.RecordRenderingStats());
-}
-
-void LayerTreeHostInProcess::InitializeThreaded(
-    scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
-    scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner) {
-  task_runner_provider_ =
-      TaskRunnerProvider::Create(main_task_runner, impl_task_runner);
-  std::unique_ptr<ProxyMain> proxy_main =
-      base::MakeUnique<ProxyMain>(this, task_runner_provider_.get());
-  InitializeProxy(std::move(proxy_main));
-}
-
-void LayerTreeHostInProcess::InitializeSingleThreaded(
-    LayerTreeHostSingleThreadClient* single_thread_client,
-    scoped_refptr<base::SingleThreadTaskRunner> main_task_runner) {
-  task_runner_provider_ = TaskRunnerProvider::Create(main_task_runner, nullptr);
-  InitializeProxy(SingleThreadProxy::Create(this, single_thread_client,
-                                            task_runner_provider_.get()));
-}
-
-void LayerTreeHostInProcess::InitializeForTesting(
-    std::unique_ptr<TaskRunnerProvider> task_runner_provider,
-    std::unique_ptr<Proxy> proxy_for_testing) {
-  task_runner_provider_ = std::move(task_runner_provider);
-  InitializeProxy(std::move(proxy_for_testing));
-}
-
-void LayerTreeHostInProcess::SetTaskRunnerProviderForTesting(
-    std::unique_ptr<TaskRunnerProvider> task_runner_provider) {
-  DCHECK(!task_runner_provider_);
-  task_runner_provider_ = std::move(task_runner_provider);
-}
-
-void LayerTreeHostInProcess::SetUIResourceManagerForTesting(
-    std::unique_ptr<UIResourceManager> ui_resource_manager) {
-  ui_resource_manager_ = std::move(ui_resource_manager);
-}
-
-void LayerTreeHostInProcess::InitializeProxy(std::unique_ptr<Proxy> proxy) {
-  TRACE_EVENT0("cc", "LayerTreeHostInProcess::InitializeForReal");
-  DCHECK(task_runner_provider_);
-
-  proxy_ = std::move(proxy);
-  proxy_->Start();
-
-  layer_tree_->mutator_host()->SetSupportsScrollAnimations(
-      proxy_->SupportsImplScrolling());
-}
-
-LayerTreeHostInProcess::~LayerTreeHostInProcess() {
-  // Track when we're inside a main frame to see if compositor is being
-  // destroyed midway which causes a crash. crbug.com/654672
-  CHECK(!inside_main_frame_);
-  TRACE_EVENT0("cc", "LayerTreeHostInProcess::~LayerTreeHostInProcess");
-
-  // Clear any references into the LayerTreeHostInProcess.
-  layer_tree_.reset();
-
-  if (proxy_) {
-    DCHECK(task_runner_provider_->IsMainThread());
-    proxy_->Stop();
-
-    // Proxy must be destroyed before the Task Runner Provider.
-    proxy_ = nullptr;
-  }
-}
-
-int LayerTreeHostInProcess::GetId() const {
-  return id_;
-}
-
-int LayerTreeHostInProcess::SourceFrameNumber() const {
-  return source_frame_number_;
-}
-
-LayerTree* LayerTreeHostInProcess::GetLayerTree() {
-  return layer_tree_.get();
-}
-
-const LayerTree* LayerTreeHostInProcess::GetLayerTree() const {
-  return layer_tree_.get();
-}
-
-UIResourceManager* LayerTreeHostInProcess::GetUIResourceManager() const {
-  return ui_resource_manager_.get();
-}
-
-TaskRunnerProvider* LayerTreeHostInProcess::GetTaskRunnerProvider() const {
-  return task_runner_provider_.get();
-}
-
-SwapPromiseManager* LayerTreeHostInProcess::GetSwapPromiseManager() {
-  return &swap_promise_manager_;
-}
-
-const LayerTreeSettings& LayerTreeHostInProcess::GetSettings() const {
-  return settings_;
-}
-
-void LayerTreeHostInProcess::SetFrameSinkId(const FrameSinkId& frame_sink_id) {
-  surface_sequence_generator_.set_frame_sink_id(frame_sink_id);
-}
-
-void LayerTreeHostInProcess::QueueSwapPromise(
-    std::unique_ptr<SwapPromise> swap_promise) {
-  swap_promise_manager_.QueueSwapPromise(std::move(swap_promise));
-}
-
-SurfaceSequenceGenerator*
-LayerTreeHostInProcess::GetSurfaceSequenceGenerator() {
-  return &surface_sequence_generator_;
-}
-
-void LayerTreeHostInProcess::WillBeginMainFrame() {
-  inside_main_frame_ = true;
-  devtools_instrumentation::WillBeginMainThreadFrame(GetId(),
-                                                     SourceFrameNumber());
-  client_->WillBeginMainFrame();
-}
-
-void LayerTreeHostInProcess::DidBeginMainFrame() {
-  inside_main_frame_ = false;
-  client_->DidBeginMainFrame();
-}
-
-void LayerTreeHostInProcess::BeginMainFrameNotExpectedSoon() {
-  client_->BeginMainFrameNotExpectedSoon();
-}
-
-void LayerTreeHostInProcess::BeginMainFrame(const BeginFrameArgs& args) {
-  client_->BeginMainFrame(args);
-}
-
-void LayerTreeHostInProcess::DidStopFlinging() {
-  proxy_->MainThreadHasStoppedFlinging();
-}
-
-const LayerTreeDebugState& LayerTreeHostInProcess::GetDebugState() const {
-  return debug_state_;
-}
-
-void LayerTreeHostInProcess::RequestMainFrameUpdate() {
-  client_->UpdateLayerTreeHost();
-}
-
-// This function commits the LayerTreeHost to an impl tree. When modifying
-// this function, keep in mind that the function *runs* on the impl thread! Any
-// code that is logically a main thread operation, e.g. deletion of a Layer,
-// should be delayed until the LayerTreeHostInProcess::CommitComplete, which
-// will run after the commit, but on the main thread.
-void LayerTreeHostInProcess::FinishCommitOnImplThread(
-    LayerTreeHostImpl* host_impl) {
-  DCHECK(task_runner_provider_->IsImplThread());
-
-  bool is_new_trace;
-  TRACE_EVENT_IS_NEW_TRACE(&is_new_trace);
-  if (is_new_trace &&
-      frame_viewer_instrumentation::IsTracingLayerTreeSnapshots() &&
-      layer_tree_->root_layer()) {
-    LayerTreeHostCommon::CallFunctionForEveryLayer(
-        layer_tree_.get(), [](Layer* layer) { layer->DidBeginTracing(); });
-  }
-
-  LayerTreeImpl* sync_tree = host_impl->sync_tree();
-
-  if (next_commit_forces_redraw_) {
-    sync_tree->ForceRedrawNextActivation();
-    next_commit_forces_redraw_ = false;
-  }
-  if (next_commit_forces_recalculate_raster_scales_) {
-    sync_tree->ForceRecalculateRasterScales();
-    next_commit_forces_recalculate_raster_scales_ = false;
-  }
-
-  sync_tree->set_source_frame_number(SourceFrameNumber());
-
-  if (layer_tree_->needs_full_tree_sync())
-    TreeSynchronizer::SynchronizeTrees(layer_tree_->root_layer(), sync_tree);
-
-  layer_tree_->PushPropertiesTo(sync_tree);
-
-  sync_tree->PassSwapPromises(swap_promise_manager_.TakeSwapPromises());
-
-  host_impl->SetHasGpuRasterizationTrigger(has_gpu_rasterization_trigger_);
-  host_impl->SetContentIsSuitableForGpuRasterization(
-      content_is_suitable_for_gpu_rasterization_);
-  RecordGpuRasterizationHistogram();
-
-  host_impl->SetViewportSize(layer_tree_->device_viewport_size());
-  sync_tree->SetDeviceScaleFactor(layer_tree_->device_scale_factor());
-  host_impl->SetDebugState(debug_state_);
-
-  sync_tree->set_ui_resource_request_queue(
-      ui_resource_manager_->TakeUIResourcesRequests());
-
-  {
-    TRACE_EVENT0("cc", "LayerTreeHostInProcess::PushProperties");
-
-    TreeSynchronizer::PushLayerProperties(layer_tree_.get(), sync_tree);
-
-    // This must happen after synchronizing property trees and after pushing
-    // properties, which updates the clobber_active_value flag.
-    sync_tree->property_trees()->scroll_tree.PushScrollUpdatesFromMainThread(
-        layer_tree_->property_trees(), sync_tree);
-
-    // This must happen after synchronizing property trees and after push
-    // properties, which updates property tree indices, but before animation
-    // host pushes properties as animation host push properties can change
-    // Animation::InEffect and we want the old InEffect value for updating
-    // property tree scrolling and animation.
-    sync_tree->UpdatePropertyTreeScrollingAndAnimationFromMainThread();
-
-    TRACE_EVENT0("cc", "LayerTreeHostInProcess::AnimationHost::PushProperties");
-    DCHECK(host_impl->mutator_host());
-    layer_tree_->mutator_host()->PushPropertiesTo(host_impl->mutator_host());
-  }
-
-  micro_benchmark_controller_.ScheduleImplBenchmarks(host_impl);
-  layer_tree_->property_trees()->ResetAllChangeTracking();
-}
-
-void LayerTreeHostInProcess::WillCommit() {
-  swap_promise_manager_.WillCommit();
-  client_->WillCommit();
-}
-
-void LayerTreeHostInProcess::UpdateHudLayer() {}
-
-void LayerTreeHostInProcess::CommitComplete() {
-  source_frame_number_++;
-  client_->DidCommit();
-  if (did_complete_scale_animation_) {
-    client_->DidCompletePageScaleAnimation();
-    did_complete_scale_animation_ = false;
-  }
-}
-
-void LayerTreeHostInProcess::SetCompositorFrameSink(
-    std::unique_ptr<CompositorFrameSink> surface) {
-  TRACE_EVENT0("cc", "LayerTreeHostInProcess::SetCompositorFrameSink");
-  DCHECK(surface);
-
-  DCHECK(!new_compositor_frame_sink_);
-  new_compositor_frame_sink_ = std::move(surface);
-  proxy_->SetCompositorFrameSink(new_compositor_frame_sink_.get());
-}
-
-std::unique_ptr<CompositorFrameSink>
-LayerTreeHostInProcess::ReleaseCompositorFrameSink() {
-  DCHECK(!visible_);
-
-  DidLoseCompositorFrameSink();
-  proxy_->ReleaseCompositorFrameSink();
-  return std::move(current_compositor_frame_sink_);
-}
-
-void LayerTreeHostInProcess::RequestNewCompositorFrameSink() {
-  client_->RequestNewCompositorFrameSink();
-}
-
-void LayerTreeHostInProcess::DidInitializeCompositorFrameSink() {
-  DCHECK(new_compositor_frame_sink_);
-  current_compositor_frame_sink_ = std::move(new_compositor_frame_sink_);
-  client_->DidInitializeCompositorFrameSink();
-}
-
-void LayerTreeHostInProcess::DidFailToInitializeCompositorFrameSink() {
-  DCHECK(new_compositor_frame_sink_);
-  // Note: It is safe to drop all output surface references here as
-  // LayerTreeHostImpl will not keep a pointer to either the old or
-  // new CompositorFrameSink after failing to initialize the new one.
-  current_compositor_frame_sink_ = nullptr;
-  new_compositor_frame_sink_ = nullptr;
-  client_->DidFailToInitializeCompositorFrameSink();
-}
-
-std::unique_ptr<LayerTreeHostImpl>
-LayerTreeHostInProcess::CreateLayerTreeHostImpl(
-    LayerTreeHostImplClient* client) {
-  DCHECK(task_runner_provider_->IsImplThread());
-
-  const bool supports_impl_scrolling = task_runner_provider_->HasImplThread();
-  std::unique_ptr<MutatorHost> mutator_host_impl =
-      layer_tree_->mutator_host()->CreateImplInstance(supports_impl_scrolling);
-
-  std::unique_ptr<LayerTreeHostImpl> host_impl = LayerTreeHostImpl::Create(
-      settings_, client, task_runner_provider_.get(),
-      rendering_stats_instrumentation_.get(), task_graph_runner_,
-      std::move(mutator_host_impl), id_, std::move(image_worker_task_runner_));
-  host_impl->SetHasGpuRasterizationTrigger(has_gpu_rasterization_trigger_);
-  host_impl->SetContentIsSuitableForGpuRasterization(
-      content_is_suitable_for_gpu_rasterization_);
-  task_graph_runner_ = NULL;
-  input_handler_weak_ptr_ = host_impl->AsWeakPtr();
-  return host_impl;
-}
-
-void LayerTreeHostInProcess::DidLoseCompositorFrameSink() {
-  TRACE_EVENT0("cc", "LayerTreeHostInProcess::DidLoseCompositorFrameSink");
-  DCHECK(task_runner_provider_->IsMainThread());
-  SetNeedsCommit();
-}
-
-void LayerTreeHostInProcess::SetDeferCommits(bool defer_commits) {
-  proxy_->SetDeferCommits(defer_commits);
-}
-
-DISABLE_CFI_PERF
-void LayerTreeHostInProcess::SetNeedsAnimate() {
-  proxy_->SetNeedsAnimate();
-  swap_promise_manager_.NotifySwapPromiseMonitorsOfSetNeedsCommit();
-}
-
-DISABLE_CFI_PERF
-void LayerTreeHostInProcess::SetNeedsUpdateLayers() {
-  proxy_->SetNeedsUpdateLayers();
-  swap_promise_manager_.NotifySwapPromiseMonitorsOfSetNeedsCommit();
-}
-
-void LayerTreeHostInProcess::SetNeedsCommit() {
-  proxy_->SetNeedsCommit();
-  swap_promise_manager_.NotifySwapPromiseMonitorsOfSetNeedsCommit();
-}
-
-void LayerTreeHostInProcess::SetNeedsRecalculateRasterScales() {
-  next_commit_forces_recalculate_raster_scales_ = true;
-  proxy_->SetNeedsCommit();
-}
-
-void LayerTreeHostInProcess::SetNeedsRedrawRect(const gfx::Rect& damage_rect) {
-  proxy_->SetNeedsRedraw(damage_rect);
-}
-
-bool LayerTreeHostInProcess::CommitRequested() const {
-  return proxy_->CommitRequested();
-}
-
-void LayerTreeHostInProcess::SetNextCommitWaitsForActivation() {
-  proxy_->SetNextCommitWaitsForActivation();
-}
-
-void LayerTreeHostInProcess::SetNextCommitForcesRedraw() {
-  next_commit_forces_redraw_ = true;
-  proxy_->SetNeedsUpdateLayers();
-}
-
-void LayerTreeHostInProcess::SetAnimationEvents(
-    std::unique_ptr<MutatorEvents> events) {
-  DCHECK(task_runner_provider_->IsMainThread());
-  layer_tree_->mutator_host()->SetAnimationEvents(std::move(events));
-}
-
-void LayerTreeHostInProcess::SetDebugState(
-    const LayerTreeDebugState& debug_state) {
-  LayerTreeDebugState new_debug_state =
-      LayerTreeDebugState::Unite(settings_.initial_debug_state, debug_state);
-
-  if (LayerTreeDebugState::Equal(debug_state_, new_debug_state))
-    return;
-
-  debug_state_ = new_debug_state;
-
-  rendering_stats_instrumentation_->set_record_rendering_stats(
-      debug_state_.RecordRenderingStats());
-
-  SetNeedsCommit();
-}
-
-void LayerTreeHostInProcess::ResetGpuRasterizationTracking() {
-  content_is_suitable_for_gpu_rasterization_ = true;
-  gpu_rasterization_histogram_recorded_ = false;
-}
-
-void LayerTreeHostInProcess::SetHasGpuRasterizationTrigger(bool has_trigger) {
-  if (has_trigger == has_gpu_rasterization_trigger_)
-    return;
-
-  has_gpu_rasterization_trigger_ = has_trigger;
-  TRACE_EVENT_INSTANT1(
-      "cc", "LayerTreeHostInProcess::SetHasGpuRasterizationTrigger",
-      TRACE_EVENT_SCOPE_THREAD, "has_trigger", has_gpu_rasterization_trigger_);
-}
-
-void LayerTreeHostInProcess::ApplyPageScaleDeltaFromImplSide(
-    float page_scale_delta) {
-  DCHECK(CommitRequested());
-  if (page_scale_delta == 1.f)
-    return;
-  float page_scale = layer_tree_->page_scale_factor() * page_scale_delta;
-  layer_tree_->SetPageScaleFromImplSide(page_scale);
-}
-
-void LayerTreeHostInProcess::SetVisible(bool visible) {
-  if (visible_ == visible)
-    return;
-  visible_ = visible;
-  proxy_->SetVisible(visible);
-}
-
-bool LayerTreeHostInProcess::IsVisible() const {
-  return visible_;
-}
-
-void LayerTreeHostInProcess::NotifyInputThrottledUntilCommit() {
-  proxy_->NotifyInputThrottledUntilCommit();
-}
-
-void LayerTreeHostInProcess::LayoutAndUpdateLayers() {
-  DCHECK(IsSingleThreaded());
-  // This function is only valid when not using the scheduler.
-  DCHECK(!settings_.single_thread_proxy_scheduler);
-  RequestMainFrameUpdate();
-  UpdateLayers();
-}
-
-void LayerTreeHostInProcess::Composite(base::TimeTicks frame_begin_time) {
-  DCHECK(IsSingleThreaded());
-  // This function is only valid when not using the scheduler.
-  DCHECK(!settings_.single_thread_proxy_scheduler);
-  SingleThreadProxy* proxy = static_cast<SingleThreadProxy*>(proxy_.get());
-
-  proxy->CompositeImmediately(frame_begin_time);
-}
-
-static int GetLayersUpdateTimeHistogramBucket(size_t numLayers) {
-  // We uses the following exponential (ratio 2) bucketization:
-  // [0, 10), [10, 30), [30, 70), [70, 150), [150, infinity)
-  if (numLayers < 10)
-    return 0;
-  if (numLayers < 30)
-    return 1;
-  if (numLayers < 70)
-    return 2;
-  if (numLayers < 150)
-    return 3;
-  return 4;
-}
-
-bool LayerTreeHostInProcess::UpdateLayers() {
-  if (!layer_tree_->root_layer()) {
-    layer_tree_->property_trees()->clear();
-    return false;
-  }
-  DCHECK(!layer_tree_->root_layer()->parent());
-  base::ElapsedTimer timer;
-
-  bool result = DoUpdateLayers(layer_tree_->root_layer());
-  micro_benchmark_controller_.DidUpdateLayers();
-
-  if (const char* client_name = GetClientNameForMetrics()) {
-    std::string histogram_name = base::StringPrintf(
-        "Compositing.%s.LayersUpdateTime.%d", client_name,
-        GetLayersUpdateTimeHistogramBucket(layer_tree_->NumLayers()));
-    base::Histogram::FactoryGet(histogram_name, 0, 10000000, 50,
-                                base::HistogramBase::kUmaTargetedHistogramFlag)
-        ->Add(timer.Elapsed().InMicroseconds());
-  }
-
-  return result || next_commit_forces_redraw_;
-}
-
-void LayerTreeHostInProcess::DidCompletePageScaleAnimation() {
-  did_complete_scale_animation_ = true;
-}
-
-void LayerTreeHostInProcess::RecordGpuRasterizationHistogram() {
-  // Gpu rasterization is only supported for Renderer compositors.
-  // Checking for IsSingleThreaded() to exclude Browser compositors.
-  if (gpu_rasterization_histogram_recorded_ || IsSingleThreaded())
-    return;
-
-  // Record how widely gpu rasterization is enabled.
-  // This number takes device/gpu whitelisting/backlisting into account.
-  // Note that we do not consider the forced gpu rasterization mode, which is
-  // mostly used for debugging purposes.
-  UMA_HISTOGRAM_BOOLEAN("Renderer4.GpuRasterizationEnabled",
-                        settings_.gpu_rasterization_enabled);
-  if (settings_.gpu_rasterization_enabled) {
-    UMA_HISTOGRAM_BOOLEAN("Renderer4.GpuRasterizationTriggered",
-                          has_gpu_rasterization_trigger_);
-    UMA_HISTOGRAM_BOOLEAN("Renderer4.GpuRasterizationSuitableContent",
-                          content_is_suitable_for_gpu_rasterization_);
-    // Record how many pages actually get gpu rasterization when enabled.
-    UMA_HISTOGRAM_BOOLEAN("Renderer4.GpuRasterizationUsed",
-                          (has_gpu_rasterization_trigger_ &&
-                           content_is_suitable_for_gpu_rasterization_));
-  }
-
-  gpu_rasterization_histogram_recorded_ = true;
-}
-
-bool LayerTreeHostInProcess::DoUpdateLayers(Layer* root_layer) {
-  TRACE_EVENT1("cc", "LayerTreeHostInProcess::DoUpdateLayers",
-               "source_frame_number", SourceFrameNumber());
-
-  layer_tree_->UpdateHudLayer(debug_state_.ShowHudInfo());
-  UpdateHudLayer();
-
-  Layer* root_scroll =
-      PropertyTreeBuilder::FindFirstScrollableLayer(root_layer);
-  Layer* page_scale_layer = layer_tree_->page_scale_layer();
-  if (!page_scale_layer && root_scroll)
-    page_scale_layer = root_scroll->parent();
-
-  if (layer_tree_->hud_layer()) {
-    layer_tree_->hud_layer()->PrepareForCalculateDrawProperties(
-        layer_tree_->device_viewport_size(),
-        layer_tree_->device_scale_factor());
-  }
-
-  gfx::Transform identity_transform;
-  LayerList update_layer_list;
-
-  {
-    TRACE_EVENT0("cc",
-                 "LayerTreeHostInProcess::UpdateLayers::BuildPropertyTrees");
-    TRACE_EVENT0(
-        TRACE_DISABLED_BY_DEFAULT("cc.debug.cdp-perf"),
-        "LayerTreeHostInProcessCommon::ComputeVisibleRectsWithPropertyTrees");
-    PropertyTreeBuilder::PreCalculateMetaInformation(root_layer);
-    bool can_render_to_separate_surface = true;
-    PropertyTrees* property_trees = layer_tree_->property_trees();
-    if (!settings_.use_layer_lists) {
-      // If use_layer_lists is set, then the property trees should have been
-      // built by the client already.
-      PropertyTreeBuilder::BuildPropertyTrees(
-          root_layer, page_scale_layer,
-          layer_tree_->inner_viewport_scroll_layer(),
-          layer_tree_->outer_viewport_scroll_layer(),
-          layer_tree_->overscroll_elasticity_layer(),
-          layer_tree_->elastic_overscroll(), layer_tree_->page_scale_factor(),
-          layer_tree_->device_scale_factor(),
-          gfx::Rect(layer_tree_->device_viewport_size()), identity_transform,
-          property_trees);
-      TRACE_EVENT_INSTANT1(
-          "cc", "LayerTreeHostInProcess::UpdateLayers_BuiltPropertyTrees",
-          TRACE_EVENT_SCOPE_THREAD, "property_trees",
-          property_trees->AsTracedValue());
-    } else {
-      TRACE_EVENT_INSTANT1(
-          "cc", "LayerTreeHostInProcess::UpdateLayers_ReceivedPropertyTrees",
-          TRACE_EVENT_SCOPE_THREAD, "property_trees",
-          property_trees->AsTracedValue());
-    }
-    draw_property_utils::UpdatePropertyTrees(property_trees,
-                                             can_render_to_separate_surface);
-    draw_property_utils::FindLayersThatNeedUpdates(
-        layer_tree_.get(), property_trees, &update_layer_list);
-  }
-
-  for (const auto& layer : update_layer_list)
-    layer->SavePaintProperties();
-
-  bool content_is_suitable_for_gpu = true;
-  bool did_paint_content = layer_tree_->UpdateLayers(
-      update_layer_list, &content_is_suitable_for_gpu);
-
-  if (content_is_suitable_for_gpu) {
-    ++num_consecutive_frames_suitable_for_gpu_;
-    if (num_consecutive_frames_suitable_for_gpu_ >=
-        kNumFramesToConsiderBeforeGpuRasterization) {
-      content_is_suitable_for_gpu_rasterization_ = true;
-    }
-  } else {
-    num_consecutive_frames_suitable_for_gpu_ = 0;
-    content_is_suitable_for_gpu_rasterization_ = false;
-  }
-  return did_paint_content;
-}
-
-void LayerTreeHostInProcess::ApplyViewportDeltas(ScrollAndScaleSet* info) {
-  gfx::Vector2dF inner_viewport_scroll_delta;
-  if (info->inner_viewport_scroll.layer_id != Layer::INVALID_ID)
-    inner_viewport_scroll_delta = info->inner_viewport_scroll.scroll_delta;
-
-  if (inner_viewport_scroll_delta.IsZero() && info->page_scale_delta == 1.f &&
-      info->elastic_overscroll_delta.IsZero() && !info->top_controls_delta)
-    return;
-
-  // Preemptively apply the scroll offset and scale delta here before sending
-  // it to the client.  If the client comes back and sets it to the same
-  // value, then the layer can early out without needing a full commit.
-  if (layer_tree_->inner_viewport_scroll_layer()) {
-    layer_tree_->inner_viewport_scroll_layer()->SetScrollOffsetFromImplSide(
-        gfx::ScrollOffsetWithDelta(
-            layer_tree_->inner_viewport_scroll_layer()->scroll_offset(),
-            inner_viewport_scroll_delta));
-  }
-
-  ApplyPageScaleDeltaFromImplSide(info->page_scale_delta);
-  layer_tree_->SetElasticOverscrollFromImplSide(
-      layer_tree_->elastic_overscroll() + info->elastic_overscroll_delta);
-  // TODO(ccameron): pass the elastic overscroll here so that input events
-  // may be translated appropriately.
-  client_->ApplyViewportDeltas(inner_viewport_scroll_delta, gfx::Vector2dF(),
-                               info->elastic_overscroll_delta,
-                               info->page_scale_delta,
-                               info->top_controls_delta);
-  SetNeedsUpdateLayers();
-}
-
-void LayerTreeHostInProcess::ApplyScrollAndScale(ScrollAndScaleSet* info) {
-  for (auto& swap_promise : info->swap_promises) {
-    TRACE_EVENT_WITH_FLOW1("input,benchmark", "LatencyInfo.Flow",
-                           TRACE_ID_DONT_MANGLE(swap_promise->TraceId()),
-                           TRACE_EVENT_FLAG_FLOW_IN | TRACE_EVENT_FLAG_FLOW_OUT,
-                           "step", "Main thread scroll update");
-    swap_promise_manager_.QueueSwapPromise(std::move(swap_promise));
-  }
-
-  if (layer_tree_->root_layer()) {
-    for (size_t i = 0; i < info->scrolls.size(); ++i) {
-      Layer* layer = layer_tree_->LayerById(info->scrolls[i].layer_id);
-      if (!layer)
-        continue;
-      layer->SetScrollOffsetFromImplSide(gfx::ScrollOffsetWithDelta(
-          layer->scroll_offset(), info->scrolls[i].scroll_delta));
-      SetNeedsUpdateLayers();
-    }
-    for (size_t i = 0; i < info->scrollbars.size(); ++i) {
-      Layer* layer = layer_tree_->LayerById(info->scrollbars[i].layer_id);
-      if (!layer)
-        continue;
-      layer->SetScrollbarsHiddenFromImplSide(info->scrollbars[i].hidden);
-    }
-  }
-
-  // This needs to happen after scroll deltas have been sent to prevent top
-  // controls from clamping the layout viewport both on the compositor and
-  // on the main thread.
-  ApplyViewportDeltas(info);
-}
-
-const base::WeakPtr<InputHandler>& LayerTreeHostInProcess::GetInputHandler()
-    const {
-  return input_handler_weak_ptr_;
-}
-
-void LayerTreeHostInProcess::UpdateBrowserControlsState(
-    BrowserControlsState constraints,
-    BrowserControlsState current,
-    bool animate) {
-  // Browser controls are only used in threaded mode.
-  DCHECK(IsThreaded());
-  proxy_->UpdateBrowserControlsState(constraints, current, animate);
-}
-
-void LayerTreeHostInProcess::AnimateLayers(base::TimeTicks monotonic_time) {
-  MutatorHost* mutator_host = layer_tree_->mutator_host();
-  std::unique_ptr<MutatorEvents> events = mutator_host->CreateEvents();
-
-  if (mutator_host->TickAnimations(monotonic_time))
-    mutator_host->UpdateAnimationState(true, events.get());
-
-  if (!events->IsEmpty())
-    layer_tree_->property_trees()->needs_rebuild = true;
-}
-
-int LayerTreeHostInProcess::ScheduleMicroBenchmark(
-    const std::string& benchmark_name,
-    std::unique_ptr<base::Value> value,
-    const MicroBenchmark::DoneCallback& callback) {
-  return micro_benchmark_controller_.ScheduleRun(benchmark_name,
-                                                 std::move(value), callback);
-}
-
-bool LayerTreeHostInProcess::SendMessageToMicroBenchmark(
-    int id,
-    std::unique_ptr<base::Value> value) {
-  return micro_benchmark_controller_.SendMessage(id, std::move(value));
-}
-
-void LayerTreeHostInProcess::SetLayerTreeMutator(
-    std::unique_ptr<LayerTreeMutator> mutator) {
-  proxy_->SetMutator(std::move(mutator));
-}
-
-bool LayerTreeHostInProcess::IsSingleThreaded() const {
-  DCHECK(compositor_mode_ != CompositorMode::SINGLE_THREADED ||
-         !task_runner_provider_->HasImplThread());
-  return compositor_mode_ == CompositorMode::SINGLE_THREADED;
-}
-
-bool LayerTreeHostInProcess::IsThreaded() const {
-  DCHECK(compositor_mode_ != CompositorMode::THREADED ||
-         task_runner_provider_->HasImplThread());
-  return compositor_mode_ == CompositorMode::THREADED;
-}
-
-}  // namespace cc