cc: Rename LayerTreeHost to LayerTreeHostInProcess.

cc/trees/layer_tree_host.cc

Index: cc/trees/layer_tree_host.cc
diff --git a/cc/trees/layer_tree_host.cc b/cc/trees/layer_tree_host.cc
deleted file mode 100644
index 5f6ea37cfb5a7b82fe30ec64e1908d22927d559c..0000000000000000000000000000000000000000
--- a/cc/trees/layer_tree_host.cc
+++ /dev/null
@@ -1,1042 +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.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/threading/thread_task_runner_handle.h"
-#include "base/trace_event/trace_event.h"
-#include "base/trace_event/trace_event_argument.h"
-#include "cc/animation/animation_events.h"
-#include "cc/animation/animation_host.h"
-#include "cc/base/math_util.h"
-#include "cc/blimp/client_picture_cache.h"
-#include "cc/blimp/engine_picture_cache.h"
-#include "cc/blimp/image_serialization_processor.h"
-#include "cc/blimp/picture_data.h"
-#include "cc/blimp/picture_data_conversions.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/layer_proto_converter.h"
-#include "cc/layers/painted_scrollbar_layer.h"
-#include "cc/proto/gfx_conversions.h"
-#include "cc/proto/layer_tree.pb.h"
-#include "cc/proto/layer_tree_host.pb.h"
-#include "cc/resources/ui_resource_manager.h"
-#include "cc/scheduler/begin_frame_source.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/property_tree_builder.h"
-#include "cc/trees/proxy_main.h"
-#include "cc/trees/remote_channel_impl.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 {
-namespace {
-
-std::unique_ptr<base::trace_event::TracedValue>
-ComputeLayerTreeHostProtoSizeSplitAsValue(proto::LayerTreeHost* proto) {
-  std::unique_ptr<base::trace_event::TracedValue> value(
-      new base::trace_event::TracedValue());
-  base::CheckedNumeric<int> base_layer_properties_size = 0;
-  base::CheckedNumeric<int> picture_layer_properties_size = 0;
-  base::CheckedNumeric<int> display_item_list_size = 0;
-  base::CheckedNumeric<int> drawing_display_items_size = 0;
-
-  const proto::LayerUpdate& layer_update_proto = proto->layer_updates();
-  for (int i = 0; i < layer_update_proto.layers_size(); ++i) {
-    const proto::LayerProperties layer_properties_proto =
-        layer_update_proto.layers(i);
-    base_layer_properties_size += layer_properties_proto.base().ByteSize();
-
-    if (layer_properties_proto.has_picture()) {
-      const proto::PictureLayerProperties& picture_proto =
-          layer_properties_proto.picture();
-      picture_layer_properties_size += picture_proto.ByteSize();
-
-      const proto::DisplayItemList& display_list_proto =
-          picture_proto.display_list();
-      display_item_list_size += display_list_proto.ByteSize();
-
-      for (int j = 0; j < display_list_proto.items_size(); ++j) {
-        const proto::DisplayItem& display_item = display_list_proto.items(j);
-        if (display_item.type() == proto::DisplayItem::Type_Drawing)
-          drawing_display_items_size += display_item.ByteSize();
-      }
-    }
-  }
-
-  value->SetInteger("TotalLayerTreeHostProtoSize", proto->ByteSize());
-  value->SetInteger("LayerTreeHierarchySize",
-                    proto->layer_tree().root_layer().ByteSize());
-  value->SetInteger("LayerUpdatesSize", proto->layer_updates().ByteSize());
-  value->SetInteger("PropertyTreesSize",
-                    proto->layer_tree().property_trees().ByteSize());
-
-  // LayerUpdate size breakdown.
-  value->SetInteger("TotalBasePropertiesSize",
-                    base_layer_properties_size.ValueOrDefault(-1));
-  value->SetInteger("PictureLayerPropertiesSize",
-                    picture_layer_properties_size.ValueOrDefault(-1));
-  value->SetInteger("DisplayItemListSize",
-                    display_item_list_size.ValueOrDefault(-1));
-  value->SetInteger("DrawingDisplayItemsSize",
-                    drawing_display_items_size.ValueOrDefault(-1));
-  return value;
-}
-
-}  // namespace
-
-LayerTreeHost::InitParams::InitParams() {
-}
-
-LayerTreeHost::InitParams::~InitParams() {
-}
-
-std::unique_ptr<LayerTreeHostInterface> LayerTreeHost::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<LayerTreeHost> layer_tree_host(
-      new LayerTreeHost(params, CompositorMode::THREADED));
-  layer_tree_host->InitializeThreaded(
-      params->main_task_runner, impl_task_runner,
-      std::move(params->external_begin_frame_source));
-  return std::move(layer_tree_host);
-}
-
-std::unique_ptr<LayerTreeHost> LayerTreeHost::CreateSingleThreaded(
-    LayerTreeHostSingleThreadClient* single_thread_client,
-    InitParams* params) {
-  DCHECK(params->settings);
-  std::unique_ptr<LayerTreeHost> layer_tree_host(
-      new LayerTreeHost(params, CompositorMode::SINGLE_THREADED));
-  layer_tree_host->InitializeSingleThreaded(
-      single_thread_client, params->main_task_runner,
-      std::move(params->external_begin_frame_source));
-  return layer_tree_host;
-}
-
-std::unique_ptr<LayerTreeHostInterface> LayerTreeHost::CreateRemoteServer(
-    RemoteProtoChannel* remote_proto_channel,
-    InitParams* params) {
-  DCHECK(params->main_task_runner.get());
-  DCHECK(params->settings);
-  DCHECK(remote_proto_channel);
-  TRACE_EVENT0("cc.remote", "LayerTreeHost::CreateRemoteServer");
-
-  // Using an external begin frame source is not supported on the server in
-  // remote mode.
-  DCHECK(!params->settings->use_external_begin_frame_source);
-  DCHECK(!params->external_begin_frame_source);
-  DCHECK(params->image_serialization_processor);
-
-  std::unique_ptr<LayerTreeHost> layer_tree_host(
-      new LayerTreeHost(params, CompositorMode::REMOTE));
-  layer_tree_host->InitializeRemoteServer(remote_proto_channel,
-                                          params->main_task_runner);
-  return std::move(layer_tree_host);
-}
-
-std::unique_ptr<LayerTreeHostInterface> LayerTreeHost::CreateRemoteClient(
-    RemoteProtoChannel* remote_proto_channel,
-    scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner,
-    InitParams* params) {
-  DCHECK(params->main_task_runner.get());
-  DCHECK(params->settings);
-  DCHECK(remote_proto_channel);
-
-  // Using an external begin frame source is not supported in remote mode.
-  // TODO(khushalsagar): Add support for providing an external begin frame
-  // source on the client LayerTreeHost. crbug/576962
-  DCHECK(!params->settings->use_external_begin_frame_source);
-  DCHECK(!params->external_begin_frame_source);
-  DCHECK(params->image_serialization_processor);
-
-  std::unique_ptr<LayerTreeHost> layer_tree_host(
-      new LayerTreeHost(params, CompositorMode::REMOTE));
-  layer_tree_host->InitializeRemoteClient(
-      remote_proto_channel, params->main_task_runner, impl_task_runner);
-  return std::move(layer_tree_host);
-}
-
-LayerTreeHost::LayerTreeHost(InitParams* params, CompositorMode mode)
-    : LayerTreeHost(
-          params,
-          mode,
-          base::MakeUnique<LayerTree>(std::move(params->animation_host),
-                                      this)) {}
-
-LayerTreeHost::LayerTreeHost(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),
-      next_commit_forces_redraw_(false),
-      shared_bitmap_manager_(params->shared_bitmap_manager),
-      gpu_memory_buffer_manager_(params->gpu_memory_buffer_manager),
-      task_graph_runner_(params->task_graph_runner),
-      image_serialization_processor_(params->image_serialization_processor) {
-  DCHECK(task_graph_runner_);
-  DCHECK(layer_tree_);
-
-  rendering_stats_instrumentation_->set_record_rendering_stats(
-      debug_state_.RecordRenderingStats());
-}
-
-void LayerTreeHost::InitializeThreaded(
-    scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
-    scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner,
-    std::unique_ptr<BeginFrameSource> external_begin_frame_source) {
-  task_runner_provider_ =
-      TaskRunnerProvider::Create(main_task_runner, impl_task_runner);
-  std::unique_ptr<ProxyMain> proxy_main =
-      ProxyMain::CreateThreaded(this, task_runner_provider_.get());
-  InitializeProxy(std::move(proxy_main),
-                  std::move(external_begin_frame_source));
-}
-
-void LayerTreeHost::InitializeSingleThreaded(
-    LayerTreeHostSingleThreadClient* single_thread_client,
-    scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
-    std::unique_ptr<BeginFrameSource> external_begin_frame_source) {
-  task_runner_provider_ = TaskRunnerProvider::Create(main_task_runner, nullptr);
-  InitializeProxy(SingleThreadProxy::Create(this, single_thread_client,
-                                            task_runner_provider_.get()),
-                  std::move(external_begin_frame_source));
-}
-
-void LayerTreeHost::InitializeRemoteServer(
-    RemoteProtoChannel* remote_proto_channel,
-    scoped_refptr<base::SingleThreadTaskRunner> main_task_runner) {
-  task_runner_provider_ = TaskRunnerProvider::Create(main_task_runner, nullptr);
-
-  if (image_serialization_processor_) {
-    engine_picture_cache_ =
-        image_serialization_processor_->CreateEnginePictureCache();
-  }
-  InitializeProxy(ProxyMain::CreateRemote(remote_proto_channel, this,
-                                          task_runner_provider_.get()),
-                  nullptr);
-}
-
-void LayerTreeHost::InitializeRemoteClient(
-    RemoteProtoChannel* remote_proto_channel,
-    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);
-
-  if (image_serialization_processor_) {
-    client_picture_cache_ =
-        image_serialization_processor_->CreateClientPictureCache();
-  }
-
-  // For the remote mode, the RemoteChannelImpl implements the Proxy, which is
-  // owned by the LayerTreeHost. The RemoteChannelImpl pipes requests which need
-  // to handled locally, for instance the Output Surface creation to the
-  // LayerTreeHost on the client, while the other requests are sent to the
-  // RemoteChannelMain on the server which directs them to ProxyMain and the
-  // remote server LayerTreeHost.
-  InitializeProxy(base::MakeUnique<RemoteChannelImpl>(
-                      this, remote_proto_channel, task_runner_provider_.get()),
-                  nullptr);
-}
-
-void LayerTreeHost::InitializeForTesting(
-    std::unique_ptr<TaskRunnerProvider> task_runner_provider,
-    std::unique_ptr<Proxy> proxy_for_testing,
-    std::unique_ptr<BeginFrameSource> external_begin_frame_source) {
-  task_runner_provider_ = std::move(task_runner_provider);
-
-  InitializePictureCacheForTesting();
-
-  InitializeProxy(std::move(proxy_for_testing),
-                  std::move(external_begin_frame_source));
-}
-
-void LayerTreeHost::InitializePictureCacheForTesting() {
-  if (!image_serialization_processor_)
-    return;
-
-  // Initialize both engine and client cache to ensure serialization tests
-  // with a single LayerTreeHost can work correctly.
-  engine_picture_cache_ =
-      image_serialization_processor_->CreateEnginePictureCache();
-  client_picture_cache_ =
-      image_serialization_processor_->CreateClientPictureCache();
-}
-
-void LayerTreeHost::SetTaskRunnerProviderForTesting(
-    std::unique_ptr<TaskRunnerProvider> task_runner_provider) {
-  DCHECK(!task_runner_provider_);
-  task_runner_provider_ = std::move(task_runner_provider);
-}
-
-void LayerTreeHost::SetUIResourceManagerForTesting(
-    std::unique_ptr<UIResourceManager> ui_resource_manager) {
-  ui_resource_manager_ = std::move(ui_resource_manager);
-}
-
-void LayerTreeHost::InitializeProxy(
-    std::unique_ptr<Proxy> proxy,
-    std::unique_ptr<BeginFrameSource> external_begin_frame_source) {
-  TRACE_EVENT0("cc", "LayerTreeHost::InitializeForReal");
-  DCHECK(task_runner_provider_);
-
-  proxy_ = std::move(proxy);
-  proxy_->Start(std::move(external_begin_frame_source));
-
-  layer_tree_->animation_host()->SetSupportsScrollAnimations(
-      proxy_->SupportsImplScrolling());
-}
-
-LayerTreeHost::~LayerTreeHost() {
-  TRACE_EVENT0("cc", "LayerTreeHost::~LayerTreeHost");
-
-  // Clear any references into the LayerTreeHost.
-  layer_tree_.reset();
-
-  if (proxy_) {
-    DCHECK(task_runner_provider_->IsMainThread());
-    proxy_->Stop();
-
-    // Proxy must be destroyed before the Task Runner Provider.
-    proxy_ = nullptr;
-  }
-}
-
-int LayerTreeHost::GetId() const {
-  return id_;
-}
-
-int LayerTreeHost::SourceFrameNumber() const {
-  return source_frame_number_;
-}
-
-LayerTree* LayerTreeHost::GetLayerTree() {
-  return layer_tree_.get();
-}
-
-const LayerTree* LayerTreeHost::GetLayerTree() const {
-  return layer_tree_.get();
-}
-
-UIResourceManager* LayerTreeHost::GetUIResourceManager() const {
-  return ui_resource_manager_.get();
-}
-
-TaskRunnerProvider* LayerTreeHost::GetTaskRunnerProvider() const {
-  return task_runner_provider_.get();
-}
-
-SwapPromiseManager* LayerTreeHost::GetSwapPromiseManager() {
-  return &swap_promise_manager_;
-}
-
-const LayerTreeSettings& LayerTreeHost::GetSettings() const {
-  return settings_;
-}
-
-void LayerTreeHost::SetSurfaceClientId(uint32_t client_id) {
-  surface_sequence_generator_.set_surface_client_id(client_id);
-}
-
-void LayerTreeHost::QueueSwapPromise(
-    std::unique_ptr<SwapPromise> swap_promise) {
-  swap_promise_manager_.QueueSwapPromise(std::move(swap_promise));
-}
-
-SurfaceSequenceGenerator* LayerTreeHost::GetSurfaceSequenceGenerator() {
-  return &surface_sequence_generator_;
-}
-
-void LayerTreeHost::WillBeginMainFrame() {
-  devtools_instrumentation::WillBeginMainThreadFrame(GetId(),
-                                                     SourceFrameNumber());
-  client_->WillBeginMainFrame();
-}
-
-void LayerTreeHost::DidBeginMainFrame() {
-  client_->DidBeginMainFrame();
-}
-
-void LayerTreeHost::BeginMainFrameNotExpectedSoon() {
-  client_->BeginMainFrameNotExpectedSoon();
-}
-
-void LayerTreeHost::BeginMainFrame(const BeginFrameArgs& args) {
-  client_->BeginMainFrame(args);
-}
-
-void LayerTreeHost::DidStopFlinging() {
-  proxy_->MainThreadHasStoppedFlinging();
-}
-
-const LayerTreeDebugState& LayerTreeHost::GetDebugState() const {
-  return debug_state_;
-}
-
-void LayerTreeHost::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 LayerTreeHost::CommitComplete, which will run
-// after the commit, but on the main thread.
-void LayerTreeHost::FinishCommitOnImplThread(LayerTreeHostImpl* host_impl) {
-  DCHECK(!IsRemoteServer());
-  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;
-  }
-
-  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());
-  // TODO(senorblanco): Move this to LayerTree::PushPropertiesTo so that it
-  // happens before GPU rasterization properties are set, since those trigger an
-  // update of GPU rasterization status, which depends on the device scale
-  // factor. (crbug.com/535700)
-  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", "LayerTreeHost::PushProperties");
-
-    TreeSynchronizer::PushLayerProperties(layer_tree_.get(), 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", "LayerTreeHost::AnimationHost::PushProperties");
-    DCHECK(host_impl->animation_host());
-    layer_tree_->animation_host()->PushPropertiesTo(
-        host_impl->animation_host());
-  }
-
-  // This must happen after synchronizing property trees and after pushing
-  // properties, which updates the clobber_active_value flag.
-  sync_tree->UpdatePropertyTreeScrollOffset(layer_tree_->property_trees());
-
-  micro_benchmark_controller_.ScheduleImplBenchmarks(host_impl);
-  layer_tree_->property_trees()->ResetAllChangeTracking();
-}
-
-void LayerTreeHost::WillCommit() {
-  swap_promise_manager_.WillCommit();
-  client_->WillCommit();
-}
-
-void LayerTreeHost::UpdateHudLayer() {
-}
-
-void LayerTreeHost::CommitComplete() {
-  source_frame_number_++;
-  client_->DidCommit();
-  if (did_complete_scale_animation_) {
-    client_->DidCompletePageScaleAnimation();
-    did_complete_scale_animation_ = false;
-  }
-}
-
-void LayerTreeHost::SetOutputSurface(std::unique_ptr<OutputSurface> surface) {
-  TRACE_EVENT0("cc", "LayerTreeHost::SetOutputSurface");
-  DCHECK(surface);
-
-  DCHECK(!new_output_surface_);
-  new_output_surface_ = std::move(surface);
-  proxy_->SetOutputSurface(new_output_surface_.get());
-}
-
-std::unique_ptr<OutputSurface> LayerTreeHost::ReleaseOutputSurface() {
-  DCHECK(!visible_);
-
-  DidLoseOutputSurface();
-  proxy_->ReleaseOutputSurface();
-  return std::move(current_output_surface_);
-}
-
-void LayerTreeHost::RequestNewOutputSurface() {
-  client_->RequestNewOutputSurface();
-}
-
-void LayerTreeHost::DidInitializeOutputSurface() {
-  DCHECK(new_output_surface_);
-  current_output_surface_ = std::move(new_output_surface_);
-  client_->DidInitializeOutputSurface();
-}
-
-void LayerTreeHost::DidFailToInitializeOutputSurface() {
-  DCHECK(new_output_surface_);
-  // Note: It is safe to drop all output surface references here as
-  // LayerTreeHostImpl will not keep a pointer to either the old or
-  // new output surface after failing to initialize the new one.
-  current_output_surface_ = nullptr;
-  new_output_surface_ = nullptr;
-  client_->DidFailToInitializeOutputSurface();
-}
-
-std::unique_ptr<LayerTreeHostImpl> LayerTreeHost::CreateLayerTreeHostImpl(
-    LayerTreeHostImplClient* client) {
-  DCHECK(!IsRemoteServer());
-  DCHECK(task_runner_provider_->IsImplThread());
-
-  const bool supports_impl_scrolling = task_runner_provider_->HasImplThread();
-  std::unique_ptr<AnimationHost> animation_host_impl =
-      layer_tree_->animation_host()->CreateImplInstance(
-          supports_impl_scrolling);
-
-  std::unique_ptr<LayerTreeHostImpl> host_impl = LayerTreeHostImpl::Create(
-      settings_, client, task_runner_provider_.get(),
-      rendering_stats_instrumentation_.get(), shared_bitmap_manager_,
-      gpu_memory_buffer_manager_, task_graph_runner_,
-      std::move(animation_host_impl), id_);
-  host_impl->SetHasGpuRasterizationTrigger(has_gpu_rasterization_trigger_);
-  host_impl->SetContentIsSuitableForGpuRasterization(
-      content_is_suitable_for_gpu_rasterization_);
-  shared_bitmap_manager_ = NULL;
-  gpu_memory_buffer_manager_ = NULL;
-  task_graph_runner_ = NULL;
-  input_handler_weak_ptr_ = host_impl->AsWeakPtr();
-  return host_impl;
-}
-
-void LayerTreeHost::DidLoseOutputSurface() {
-  TRACE_EVENT0("cc", "LayerTreeHost::DidLoseOutputSurface");
-  DCHECK(task_runner_provider_->IsMainThread());
-  SetNeedsCommit();
-}
-
-void LayerTreeHost::SetDeferCommits(bool defer_commits) {
-  proxy_->SetDeferCommits(defer_commits);
-}
-
-DISABLE_CFI_PERF
-void LayerTreeHost::SetNeedsAnimate() {
-  proxy_->SetNeedsAnimate();
-  swap_promise_manager_.NotifySwapPromiseMonitorsOfSetNeedsCommit();
-}
-
-DISABLE_CFI_PERF
-void LayerTreeHost::SetNeedsUpdateLayers() {
-  proxy_->SetNeedsUpdateLayers();
-  swap_promise_manager_.NotifySwapPromiseMonitorsOfSetNeedsCommit();
-}
-
-void LayerTreeHost::SetNeedsCommit() {
-  proxy_->SetNeedsCommit();
-  swap_promise_manager_.NotifySwapPromiseMonitorsOfSetNeedsCommit();
-}
-
-void LayerTreeHost::SetNeedsRedraw() {
-  SetNeedsRedrawRect(gfx::Rect(layer_tree_->device_viewport_size()));
-}
-
-void LayerTreeHost::SetNeedsRedrawRect(const gfx::Rect& damage_rect) {
-  proxy_->SetNeedsRedraw(damage_rect);
-}
-
-bool LayerTreeHost::CommitRequested() const {
-  return proxy_->CommitRequested();
-}
-
-bool LayerTreeHost::BeginMainFrameRequested() const {
-  return proxy_->BeginMainFrameRequested();
-}
-
-void LayerTreeHost::SetNextCommitWaitsForActivation() {
-  proxy_->SetNextCommitWaitsForActivation();
-}
-
-void LayerTreeHost::SetNextCommitForcesRedraw() {
-  next_commit_forces_redraw_ = true;
-  proxy_->SetNeedsUpdateLayers();
-}
-
-void LayerTreeHost::SetAnimationEvents(
-    std::unique_ptr<AnimationEvents> events) {
-  DCHECK(task_runner_provider_->IsMainThread());
-  layer_tree_->animation_host()->SetAnimationEvents(std::move(events));
-}
-
-void LayerTreeHost::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 LayerTreeHost::ResetGpuRasterizationTracking() {
-  content_is_suitable_for_gpu_rasterization_ = true;
-  gpu_rasterization_histogram_recorded_ = false;
-}
-
-void LayerTreeHost::SetHasGpuRasterizationTrigger(bool has_trigger) {
-  if (has_trigger == has_gpu_rasterization_trigger_)
-    return;
-
-  has_gpu_rasterization_trigger_ = has_trigger;
-  TRACE_EVENT_INSTANT1("cc",
-                       "LayerTreeHost::SetHasGpuRasterizationTrigger",
-                       TRACE_EVENT_SCOPE_THREAD,
-                       "has_trigger",
-                       has_gpu_rasterization_trigger_);
-}
-
-void LayerTreeHost::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 LayerTreeHost::SetVisible(bool visible) {
-  if (visible_ == visible)
-    return;
-  visible_ = visible;
-  proxy_->SetVisible(visible);
-}
-
-bool LayerTreeHost::IsVisible() const {
-  return visible_;
-}
-
-void LayerTreeHost::NotifyInputThrottledUntilCommit() {
-  proxy_->NotifyInputThrottledUntilCommit();
-}
-
-void LayerTreeHost::LayoutAndUpdateLayers() {
-  DCHECK(IsSingleThreaded());
-  // This function is only valid when not using the scheduler.
-  DCHECK(!settings_.single_thread_proxy_scheduler);
-  RequestMainFrameUpdate();
-  UpdateLayers();
-}
-
-void LayerTreeHost::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);
-}
-
-bool LayerTreeHost::UpdateLayers() {
-  if (!layer_tree_->root_layer())
-    return false;
-  DCHECK(!layer_tree_->root_layer()->parent());
-  bool result = DoUpdateLayers(layer_tree_->root_layer());
-  micro_benchmark_controller_.DidUpdateLayers();
-  return result || next_commit_forces_redraw_;
-}
-
-void LayerTreeHost::DidCompletePageScaleAnimation() {
-  did_complete_scale_animation_ = true;
-}
-
-void LayerTreeHost::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 LayerTreeHost::DoUpdateLayers(Layer* root_layer) {
-  TRACE_EVENT1("cc", "LayerTreeHost::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", "LayerTreeHost::UpdateLayers::BuildPropertyTrees");
-    TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("cc.debug.cdp-perf"),
-                 "LayerTreeHostCommon::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",
-                           "LayerTreeHost::UpdateLayers_BuiltPropertyTrees",
-                           TRACE_EVENT_SCOPE_THREAD, "property_trees",
-                           property_trees->AsTracedValue());
-    } else {
-      TRACE_EVENT_INSTANT1("cc",
-                           "LayerTreeHost::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->transform_tree,
-        property_trees->effect_tree, &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 LayerTreeHost::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 LayerTreeHost::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();
-    }
-  }
-
-  // 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>& LayerTreeHost::GetInputHandler() const {
-  return input_handler_weak_ptr_;
-}
-
-void LayerTreeHost::UpdateTopControlsState(TopControlsState constraints,
-                                           TopControlsState current,
-                                           bool animate) {
-  // Top controls are only used in threaded or remote mode.
-  DCHECK(IsThreaded() || IsRemoteServer());
-  proxy_->UpdateTopControlsState(constraints, current, animate);
-}
-
-void LayerTreeHost::AnimateLayers(base::TimeTicks monotonic_time) {
-  AnimationHost* animation_host = layer_tree_->animation_host();
-  std::unique_ptr<AnimationEvents> events = animation_host->CreateEvents();
-
-  if (animation_host->AnimateLayers(monotonic_time))
-    animation_host->UpdateAnimationState(true, events.get());
-
-  if (!events->events_.empty())
-    layer_tree_->property_trees()->needs_rebuild = true;
-}
-
-int LayerTreeHost::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 LayerTreeHost::SendMessageToMicroBenchmark(
-    int id,
-    std::unique_ptr<base::Value> value) {
-  return micro_benchmark_controller_.SendMessage(id, std::move(value));
-}
-
-void LayerTreeHost::SetLayerTreeMutator(
-    std::unique_ptr<LayerTreeMutator> mutator) {
-  proxy_->SetMutator(std::move(mutator));
-}
-
-bool LayerTreeHost::IsSingleThreaded() const {
-  DCHECK(compositor_mode_ != CompositorMode::SINGLE_THREADED ||
-         !task_runner_provider_->HasImplThread());
-  return compositor_mode_ == CompositorMode::SINGLE_THREADED;
-}
-
-bool LayerTreeHost::IsThreaded() const {
-  DCHECK(compositor_mode_ != CompositorMode::THREADED ||
-         task_runner_provider_->HasImplThread());
-  return compositor_mode_ == CompositorMode::THREADED;
-}
-
-bool LayerTreeHost::IsRemoteServer() const {
-  // The LayerTreeHost on the server does not have an impl task runner.
-  return compositor_mode_ == CompositorMode::REMOTE &&
-         !task_runner_provider_->HasImplThread();
-}
-
-bool LayerTreeHost::IsRemoteClient() const {
-  return compositor_mode_ == CompositorMode::REMOTE &&
-         task_runner_provider_->HasImplThread();
-}
-
-void LayerTreeHost::ToProtobufForCommit(
-    proto::LayerTreeHost* proto,
-    std::vector<std::unique_ptr<SwapPromise>>* swap_promises) {
-  DCHECK(engine_picture_cache_);
-  // Not all fields are serialized, as they are either not needed for a commit,
-  // or implementation isn't ready yet.
-  // Unsupported items:
-  // - animations
-  // - UI resources
-  // - instrumentation of stats
-  // - histograms
-  // Skipped items:
-  // - SwapPromise as they are mostly used for perf measurements.
-  // - The bitmap and GPU memory related items.
-  // Other notes:
-  // - The output surfaces are only valid on the client-side so they are
-  //   therefore not serialized.
-  // - LayerTreeSettings are needed only during construction of the
-  //   LayerTreeHost, so they are serialized outside of the LayerTreeHost
-  //   serialization.
-  // - The |visible_| flag will be controlled from the client separately and
-  //   will need special handling outside of the serialization of the
-  //   LayerTreeHost.
-  // TODO(nyquist): Figure out how to support animations. See crbug.com/570376.
-  TRACE_EVENT0("cc.remote", "LayerTreeHost::ToProtobufForCommit");
-  *swap_promises = swap_promise_manager_.TakeSwapPromises();
-
-  proto->set_source_frame_number(source_frame_number_);
-
-  // Serialize the LayerTree before serializing the properties. During layer
-  // property serialization, we clear the list |layer_that_should_properties_|
-  // from the LayerTree.
-  layer_tree_->ToProtobuf(proto->mutable_layer_tree());
-
-  LayerProtoConverter::SerializeLayerProperties(this,
-                                                proto->mutable_layer_updates());
-
-  std::vector<PictureData> pictures =
-      engine_picture_cache_->CalculateCacheUpdateAndFlush();
-  proto::PictureDataVectorToSkPicturesProto(pictures,
-                                            proto->mutable_pictures());
-
-  debug_state_.ToProtobuf(proto->mutable_debug_state());
-  proto->set_has_gpu_rasterization_trigger(has_gpu_rasterization_trigger_);
-  proto->set_content_is_suitable_for_gpu_rasterization(
-      content_is_suitable_for_gpu_rasterization_);
-  proto->set_id(id_);
-  proto->set_next_commit_forces_redraw(next_commit_forces_redraw_);
-
-  TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID(
-      "cc.remote", "LayerTreeHostProto", source_frame_number_,
-      ComputeLayerTreeHostProtoSizeSplitAsValue(proto));
-}
-
-void LayerTreeHost::FromProtobufForCommit(const proto::LayerTreeHost& proto) {
-  DCHECK(client_picture_cache_);
-  source_frame_number_ = proto.source_frame_number();
-
-  layer_tree_->FromProtobuf(proto.layer_tree());
-
-  // Ensure ClientPictureCache contains all the necessary SkPictures before
-  // deserializing the properties.
-  proto::SkPictures proto_pictures = proto.pictures();
-  std::vector<PictureData> pictures =
-      SkPicturesProtoToPictureDataVector(proto_pictures);
-  client_picture_cache_->ApplyCacheUpdate(pictures);
-
-  LayerProtoConverter::DeserializeLayerProperties(layer_tree_->root_layer(),
-                                                  proto.layer_updates());
-
-  // The deserialization is finished, so now clear the cache.
-  client_picture_cache_->Flush();
-
-  debug_state_.FromProtobuf(proto.debug_state());
-  has_gpu_rasterization_trigger_ = proto.has_gpu_rasterization_trigger();
-  content_is_suitable_for_gpu_rasterization_ =
-      proto.content_is_suitable_for_gpu_rasterization();
-  id_ = proto.id();
-  next_commit_forces_redraw_ = proto.next_commit_forces_redraw();
-}
-
-}  // namespace cc