cc/trees/layer_tree_host.cc

   1 // Copyright 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "cc/trees/layer_tree_host.h"
   6
   7 #include <algorithm>
   8 #include <stack>
   9 #include <string>
  10
  11 #include "base/atomic_sequence_num.h"
  12 #include "base/auto_reset.h"
  13 #include "base/bind.h"
  14 #include "base/command_line.h"
  15 #include "base/location.h"
  16 #include "base/metrics/histogram.h"
  17 #include "base/single_thread_task_runner.h"
  18 #include "base/stl_util.h"
  19 #include "base/strings/string_number_conversions.h"
  20 #include "base/thread_task_runner_handle.h"
  21 #include "base/trace_event/trace_event.h"
  22 #include "base/trace_event/trace_event_argument.h"
  23 #include "cc/animation/animation_host.h"
  24 #include "cc/animation/animation_registrar.h"
  25 #include "cc/animation/layer_animation_controller.h"
  26 #include "cc/base/math_util.h"
  27 #include "cc/debug/devtools_instrumentation.h"
  28 #include "cc/debug/frame_viewer_instrumentation.h"
  29 #include "cc/debug/rendering_stats_instrumentation.h"
  30 #include "cc/input/layer_selection_bound.h"
  31 #include "cc/input/page_scale_animation.h"
  32 #include "cc/input/top_controls_manager.h"
  33 #include "cc/layers/heads_up_display_layer.h"
  34 #include "cc/layers/heads_up_display_layer_impl.h"
  35 #include "cc/layers/layer.h"
  36 #include "cc/layers/layer_iterator.h"
  37 #include "cc/layers/painted_scrollbar_layer.h"
  38 #include "cc/layers/render_surface.h"
  39 #include "cc/resources/ui_resource_request.h"
  40 #include "cc/scheduler/begin_frame_source.h"
  41 #include "cc/trees/draw_property_utils.h"
  42 #include "cc/trees/layer_tree_host_client.h"
  43 #include "cc/trees/layer_tree_host_common.h"
  44 #include "cc/trees/layer_tree_host_impl.h"
  45 #include "cc/trees/layer_tree_impl.h"
  46 #include "cc/trees/single_thread_proxy.h"
  47 #include "cc/trees/thread_proxy.h"
  48 #include "cc/trees/tree_synchronizer.h"
  49 #include "ui/gfx/geometry/size_conversions.h"
  50 #include "ui/gfx/geometry/vector2d_conversions.h"
  51
  52 namespace {
  53 static base::StaticAtomicSequenceNumber s_layer_tree_host_sequence_number;
  54 }
  55
  56 namespace cc {
  57
  58 LayerTreeHost::InitParams::InitParams() {
  59 }
  60
  61 LayerTreeHost::InitParams::~InitParams() {
  62 }
  63
  64 scoped_ptr<LayerTreeHost> LayerTreeHost::CreateThreaded(
  65     scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner,
  66     InitParams* params) {
  67   DCHECK(params->main_task_runner.get());
  68   DCHECK(impl_task_runner.get());
  69   DCHECK(params->settings);
  70   scoped_ptr<LayerTreeHost> layer_tree_host(new LayerTreeHost(params));
  71   layer_tree_host->InitializeThreaded(
  72       params->main_task_runner, impl_task_runner,
  73       params->external_begin_frame_source.Pass());
  74   return layer_tree_host.Pass();
  75 }
  76
  77 scoped_ptr<LayerTreeHost> LayerTreeHost::CreateSingleThreaded(
  78     LayerTreeHostSingleThreadClient* single_thread_client,
  79     InitParams* params) {
  80   DCHECK(params->settings);
  81   scoped_ptr<LayerTreeHost> layer_tree_host(new LayerTreeHost(params));
  82   layer_tree_host->InitializeSingleThreaded(
  83       single_thread_client, params->main_task_runner,
  84       params->external_begin_frame_source.Pass());
  85   return layer_tree_host.Pass();
  86 }
  87
  88 LayerTreeHost::LayerTreeHost(InitParams* params)
  89     : micro_benchmark_controller_(this),
  90       next_ui_resource_id_(1),
  91       inside_begin_main_frame_(false),
  92       needs_full_tree_sync_(true),
  93       needs_meta_info_recomputation_(true),
  94       client_(params->client),
  95       source_frame_number_(0),
  96       meta_information_sequence_number_(1),
  97       rendering_stats_instrumentation_(RenderingStatsInstrumentation::Create()),
  98       output_surface_lost_(true),
  99       settings_(*params->settings),
 100       debug_state_(settings_.initial_debug_state),
 101       top_controls_shrink_blink_size_(false),
 102       top_controls_height_(0.f),
 103       top_controls_shown_ratio_(0.f),
 104       hide_pinch_scrollbars_near_min_scale_(false),
 105       device_scale_factor_(1.f),
 106       visible_(true),
 107       page_scale_factor_(1.f),
 108       min_page_scale_factor_(1.f),
 109       max_page_scale_factor_(1.f),
 110       has_gpu_rasterization_trigger_(false),
 111       content_is_suitable_for_gpu_rasterization_(true),
 112       gpu_rasterization_histogram_recorded_(false),
 113       background_color_(SK_ColorWHITE),
 114       has_transparent_background_(false),
 115       did_complete_scale_animation_(false),
 116       in_paint_layer_contents_(false),
 117       id_(s_layer_tree_host_sequence_number.GetNext() + 1),
 118       next_commit_forces_redraw_(false),
 119       shared_bitmap_manager_(params->shared_bitmap_manager),
 120       gpu_memory_buffer_manager_(params->gpu_memory_buffer_manager),
 121       task_graph_runner_(params->task_graph_runner),
 122       surface_id_namespace_(0u),
 123       next_surface_sequence_(1u) {
 124   DCHECK(task_graph_runner_);
 125
 126   if (settings_.accelerated_animation_enabled) {
 127     if (settings_.use_compositor_animation_timelines) {
 128       animation_host_ = AnimationHost::Create(ThreadInstance::MAIN);
 129       animation_host_->SetMutatorHostClient(this);
 130     } else {
 131       animation_registrar_ = AnimationRegistrar::Create();
 132     }
 133   }
 134
 135   rendering_stats_instrumentation_->set_record_rendering_stats(
 136       debug_state_.RecordRenderingStats());
 137 }
 138
 139 void LayerTreeHost::InitializeThreaded(
 140     scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
 141     scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner,
 142     scoped_ptr<BeginFrameSource> external_begin_frame_source) {
 143   InitializeProxy(ThreadProxy::Create(this,
 144                                       main_task_runner,
 145                                       impl_task_runner,
 146                                       external_begin_frame_source.Pass()));
 147 }
 148
 149 void LayerTreeHost::InitializeSingleThreaded(
 150     LayerTreeHostSingleThreadClient* single_thread_client,
 151     scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
 152     scoped_ptr<BeginFrameSource> external_begin_frame_source) {
 153   InitializeProxy(
 154       SingleThreadProxy::Create(this,
 155                                 single_thread_client,
 156                                 main_task_runner,
 157                                 external_begin_frame_source.Pass()));
 158 }
 159
 160 void LayerTreeHost::InitializeForTesting(scoped_ptr<Proxy> proxy_for_testing) {
 161   InitializeProxy(proxy_for_testing.Pass());
 162 }
 163
 164 void LayerTreeHost::InitializeProxy(scoped_ptr<Proxy> proxy) {
 165   TRACE_EVENT0("cc", "LayerTreeHost::InitializeForReal");
 166
 167   proxy_ = proxy.Pass();
 168   proxy_->Start();
 169   if (settings_.accelerated_animation_enabled) {
 170     if (animation_host_)
 171       animation_host_->SetSupportsScrollAnimations(
 172           proxy_->SupportsImplScrolling());
 173     else
 174       animation_registrar_->set_supports_scroll_animations(
 175           proxy_->SupportsImplScrolling());
 176   }
 177 }
 178
 179 LayerTreeHost::~LayerTreeHost() {
 180   TRACE_EVENT0("cc", "LayerTreeHost::~LayerTreeHost");
 181
 182   if (animation_host_)
 183     animation_host_->SetMutatorHostClient(nullptr);
 184
 185   if (root_layer_.get())
 186     root_layer_->SetLayerTreeHost(NULL);
 187
 188   DCHECK(swap_promise_monitor_.empty());
 189
 190   BreakSwapPromises(SwapPromise::COMMIT_FAILS);
 191
 192   if (proxy_) {
 193     DCHECK(proxy_->IsMainThread());
 194     proxy_->Stop();
 195   }
 196
 197   // We must clear any pointers into the layer tree prior to destroying it.
 198   RegisterViewportLayers(NULL, NULL, NULL, NULL);
 199
 200   if (root_layer_.get()) {
 201     // The layer tree must be destroyed before the layer tree host. We've
 202     // made a contract with our animation controllers that the registrar
 203     // will outlive them, and we must make good.
 204     root_layer_ = NULL;
 205   }
 206 }
 207
 208 void LayerTreeHost::SetLayerTreeHostClientReady() {
 209   proxy_->SetLayerTreeHostClientReady();
 210 }
 211
 212 void LayerTreeHost::WillBeginMainFrame() {
 213   devtools_instrumentation::WillBeginMainThreadFrame(id(),
 214                                                      source_frame_number());
 215   client_->WillBeginMainFrame();
 216 }
 217
 218 void LayerTreeHost::DidBeginMainFrame() {
 219   client_->DidBeginMainFrame();
 220 }
 221
 222 void LayerTreeHost::BeginMainFrameNotExpectedSoon() {
 223   client_->BeginMainFrameNotExpectedSoon();
 224 }
 225
 226 void LayerTreeHost::BeginMainFrame(const BeginFrameArgs& args) {
 227   inside_begin_main_frame_ = true;
 228   client_->BeginMainFrame(args);
 229   inside_begin_main_frame_ = false;
 230 }
 231
 232 void LayerTreeHost::DidStopFlinging() {
 233   proxy_->MainThreadHasStoppedFlinging();
 234 }
 235
 236 void LayerTreeHost::Layout() {
 237   client_->Layout();
 238 }
 239
 240 void LayerTreeHost::BeginCommitOnImplThread(LayerTreeHostImpl* host_impl) {
 241   DCHECK(proxy_->IsImplThread());
 242   TRACE_EVENT0("cc", "LayerTreeHost::CommitTo");
 243 }
 244
 245 // This function commits the LayerTreeHost to an impl tree. When modifying
 246 // this function, keep in mind that the function *runs* on the impl thread! Any
 247 // code that is logically a main thread operation, e.g. deletion of a Layer,
 248 // should be delayed until the LayerTreeHost::CommitComplete, which will run
 249 // after the commit, but on the main thread.
 250 void LayerTreeHost::FinishCommitOnImplThread(LayerTreeHostImpl* host_impl) {
 251   DCHECK(proxy_->IsImplThread());
 252
 253   bool is_new_trace;
 254   TRACE_EVENT_IS_NEW_TRACE(&is_new_trace);
 255   if (is_new_trace &&
 256       frame_viewer_instrumentation::IsTracingLayerTreeSnapshots() &&
 257       root_layer()) {
 258     LayerTreeHostCommon::CallFunctionForSubtree(
 259         root_layer(), [](Layer* layer) { layer->DidBeginTracing(); });
 260   }
 261
 262   LayerTreeImpl* sync_tree = host_impl->sync_tree();
 263
 264   if (next_commit_forces_redraw_) {
 265     sync_tree->ForceRedrawNextActivation();
 266     next_commit_forces_redraw_ = false;
 267   }
 268
 269   sync_tree->set_source_frame_number(source_frame_number());
 270
 271   if (needs_full_tree_sync_) {
 272     sync_tree->SetRootLayer(TreeSynchronizer::SynchronizeTrees(
 273         root_layer(), sync_tree->DetachLayerTree(), sync_tree));
 274   }
 275   sync_tree->set_needs_full_tree_sync(needs_full_tree_sync_);
 276   needs_full_tree_sync_ = false;
 277
 278   if (hud_layer_.get()) {
 279     LayerImpl* hud_impl = LayerTreeHostCommon::FindLayerInSubtree(
 280         sync_tree->root_layer(), hud_layer_->id());
 281     sync_tree->set_hud_layer(static_cast<HeadsUpDisplayLayerImpl*>(hud_impl));
 282   } else {
 283     sync_tree->set_hud_layer(NULL);
 284   }
 285
 286   sync_tree->set_background_color(background_color_);
 287   sync_tree->set_has_transparent_background(has_transparent_background_);
 288
 289   if (page_scale_layer_.get() && inner_viewport_scroll_layer_.get()) {
 290     sync_tree->SetViewportLayersFromIds(
 291         overscroll_elasticity_layer_.get() ? overscroll_elasticity_layer_->id()
 292                                            : Layer::INVALID_ID,
 293         page_scale_layer_->id(), inner_viewport_scroll_layer_->id(),
 294         outer_viewport_scroll_layer_.get() ? outer_viewport_scroll_layer_->id()
 295                                            : Layer::INVALID_ID);
 296     DCHECK(inner_viewport_scroll_layer_->IsContainerForFixedPositionLayers());
 297   } else {
 298     sync_tree->ClearViewportLayers();
 299   }
 300
 301   sync_tree->RegisterSelection(selection_);
 302
 303   // Setting property trees must happen before pushing the page scale.
 304   sync_tree->SetPropertyTrees(property_trees_);
 305
 306   sync_tree->set_hide_pinch_scrollbars_near_min_scale(
 307       hide_pinch_scrollbars_near_min_scale_);
 308
 309   sync_tree->PushPageScaleFromMainThread(
 310       page_scale_factor_, min_page_scale_factor_, max_page_scale_factor_);
 311   sync_tree->elastic_overscroll()->PushFromMainThread(elastic_overscroll_);
 312   if (sync_tree->IsActiveTree())
 313     sync_tree->elastic_overscroll()->PushPendingToActive();
 314
 315   sync_tree->PassSwapPromises(&swap_promise_list_);
 316
 317   sync_tree->set_top_controls_shrink_blink_size(
 318       top_controls_shrink_blink_size_);
 319   sync_tree->set_top_controls_height(top_controls_height_);
 320   sync_tree->PushTopControlsFromMainThread(top_controls_shown_ratio_);
 321
 322   host_impl->SetHasGpuRasterizationTrigger(has_gpu_rasterization_trigger_);
 323   host_impl->SetContentIsSuitableForGpuRasterization(
 324       content_is_suitable_for_gpu_rasterization_);
 325   RecordGpuRasterizationHistogram();
 326
 327   host_impl->SetViewportSize(device_viewport_size_);
 328   host_impl->SetDeviceScaleFactor(device_scale_factor_);
 329   host_impl->SetDebugState(debug_state_);
 330   if (pending_page_scale_animation_) {
 331     sync_tree->SetPendingPageScaleAnimation(
 332         pending_page_scale_animation_.Pass());
 333   }
 334
 335   if (!ui_resource_request_queue_.empty()) {
 336     sync_tree->set_ui_resource_request_queue(ui_resource_request_queue_);
 337     ui_resource_request_queue_.clear();
 338   }
 339
 340   DCHECK(!sync_tree->ViewportSizeInvalid());
 341
 342   sync_tree->set_has_ever_been_drawn(false);
 343
 344   {
 345     TRACE_EVENT0("cc", "LayerTreeHost::PushProperties");
 346     TreeSynchronizer::PushProperties(root_layer(), sync_tree->root_layer());
 347
 348     if (animation_host_) {
 349       DCHECK(host_impl->animation_host());
 350       animation_host_->PushPropertiesTo(host_impl->animation_host());
 351     }
 352   }
 353
 354   // This must happen after synchronizing property trees and after push
 355   // properties, which updates property tree indices.
 356   sync_tree->UpdatePropertyTreeScrollingAndAnimationFromMainThread();
 357
 358   micro_benchmark_controller_.ScheduleImplBenchmarks(host_impl);
 359 }
 360
 361 void LayerTreeHost::WillCommit() {
 362   OnCommitForSwapPromises();
 363   client_->WillCommit();
 364 }
 365
 366 void LayerTreeHost::UpdateHudLayer() {
 367   if (debug_state_.ShowHudInfo()) {
 368     if (!hud_layer_.get()) {
 369       LayerSettings hud_layer_settings;
 370       hud_layer_settings.use_compositor_animation_timelines =
 371           settings_.use_compositor_animation_timelines;
 372       hud_layer_ = HeadsUpDisplayLayer::Create(hud_layer_settings);
 373     }
 374
 375     if (root_layer_.get() && !hud_layer_->parent())
 376       root_layer_->AddChild(hud_layer_);
 377   } else if (hud_layer_.get()) {
 378     hud_layer_->RemoveFromParent();
 379     hud_layer_ = NULL;
 380   }
 381 }
 382
 383 void LayerTreeHost::CommitComplete() {
 384   source_frame_number_++;
 385   client_->DidCommit();
 386   if (did_complete_scale_animation_) {
 387     client_->DidCompletePageScaleAnimation();
 388     did_complete_scale_animation_ = false;
 389   }
 390 }
 391
 392 void LayerTreeHost::SetOutputSurface(scoped_ptr<OutputSurface> surface) {
 393   TRACE_EVENT0("cc", "LayerTreeHost::SetOutputSurface");
 394   DCHECK(output_surface_lost_);
 395   DCHECK(surface);
 396
 397   proxy_->SetOutputSurface(surface.Pass());
 398 }
 399
 400 void LayerTreeHost::RequestNewOutputSurface() {
 401   client_->RequestNewOutputSurface();
 402 }
 403
 404 void LayerTreeHost::DidInitializeOutputSurface() {
 405   output_surface_lost_ = false;
 406   if (root_layer()) {
 407     LayerTreeHostCommon::CallFunctionForSubtree(
 408         root_layer(), [](Layer* layer) { layer->OnOutputSurfaceCreated(); });
 409   }
 410   client_->DidInitializeOutputSurface();
 411 }
 412
 413 void LayerTreeHost::DidFailToInitializeOutputSurface() {
 414   DCHECK(output_surface_lost_);
 415   client_->DidFailToInitializeOutputSurface();
 416 }
 417
 418 scoped_ptr<LayerTreeHostImpl> LayerTreeHost::CreateLayerTreeHostImpl(
 419     LayerTreeHostImplClient* client) {
 420   DCHECK(proxy_->IsImplThread());
 421   scoped_ptr<LayerTreeHostImpl> host_impl = LayerTreeHostImpl::Create(
 422       settings_, client, proxy_.get(), rendering_stats_instrumentation_.get(),
 423       shared_bitmap_manager_, gpu_memory_buffer_manager_, task_graph_runner_,
 424       id_);
 425   host_impl->SetHasGpuRasterizationTrigger(has_gpu_rasterization_trigger_);
 426   host_impl->SetContentIsSuitableForGpuRasterization(
 427       content_is_suitable_for_gpu_rasterization_);
 428   shared_bitmap_manager_ = NULL;
 429   gpu_memory_buffer_manager_ = NULL;
 430   task_graph_runner_ = NULL;
 431   top_controls_manager_weak_ptr_ =
 432       host_impl->top_controls_manager()->AsWeakPtr();
 433   input_handler_weak_ptr_ = host_impl->AsWeakPtr();
 434   return host_impl.Pass();
 435 }
 436
 437 void LayerTreeHost::DidLoseOutputSurface() {
 438   TRACE_EVENT0("cc", "LayerTreeHost::DidLoseOutputSurface");
 439   DCHECK(proxy_->IsMainThread());
 440
 441   if (output_surface_lost_)
 442     return;
 443
 444   output_surface_lost_ = true;
 445   SetNeedsCommit();
 446 }
 447
 448 void LayerTreeHost::FinishAllRendering() {
 449   proxy_->FinishAllRendering();
 450 }
 451
 452 void LayerTreeHost::SetDeferCommits(bool defer_commits) {
 453   proxy_->SetDeferCommits(defer_commits);
 454 }
 455
 456 void LayerTreeHost::SetNeedsDisplayOnAllLayers() {
 457   std::stack<Layer*> layer_stack;
 458   layer_stack.push(root_layer());
 459   while (!layer_stack.empty()) {
 460     Layer* current_layer = layer_stack.top();
 461     layer_stack.pop();
 462     current_layer->SetNeedsDisplay();
 463     for (unsigned int i = 0; i < current_layer->children().size(); i++) {
 464       layer_stack.push(current_layer->child_at(i));
 465     }
 466   }
 467 }
 468
 469 const RendererCapabilities& LayerTreeHost::GetRendererCapabilities() const {
 470   return proxy_->GetRendererCapabilities();
 471 }
 472
 473 void LayerTreeHost::SetNeedsAnimate() {
 474   proxy_->SetNeedsAnimate();
 475   NotifySwapPromiseMonitorsOfSetNeedsCommit();
 476 }
 477
 478 void LayerTreeHost::SetNeedsUpdateLayers() {
 479   proxy_->SetNeedsUpdateLayers();
 480   NotifySwapPromiseMonitorsOfSetNeedsCommit();
 481 }
 482
 483 void LayerTreeHost::SetNeedsCommit() {
 484   proxy_->SetNeedsCommit();
 485   NotifySwapPromiseMonitorsOfSetNeedsCommit();
 486 }
 487
 488 void LayerTreeHost::SetNeedsFullTreeSync() {
 489   needs_full_tree_sync_ = true;
 490   needs_meta_info_recomputation_ = true;
 491
 492   property_trees_.needs_rebuild = true;
 493   SetNeedsCommit();
 494 }
 495
 496 void LayerTreeHost::SetNeedsMetaInfoRecomputation(bool needs_recomputation) {
 497   needs_meta_info_recomputation_ = needs_recomputation;
 498 }
 499
 500 void LayerTreeHost::SetNeedsRedraw() {
 501   SetNeedsRedrawRect(gfx::Rect(device_viewport_size_));
 502 }
 503
 504 void LayerTreeHost::SetNeedsRedrawRect(const gfx::Rect& damage_rect) {
 505   proxy_->SetNeedsRedraw(damage_rect);
 506 }
 507
 508 bool LayerTreeHost::CommitRequested() const {
 509   return proxy_->CommitRequested();
 510 }
 511
 512 bool LayerTreeHost::BeginMainFrameRequested() const {
 513   return proxy_->BeginMainFrameRequested();
 514 }
 515
 516
 517 void LayerTreeHost::SetNextCommitWaitsForActivation() {
 518   proxy_->SetNextCommitWaitsForActivation();
 519 }
 520
 521 void LayerTreeHost::SetNextCommitForcesRedraw() {
 522   next_commit_forces_redraw_ = true;
 523 }
 524
 525 void LayerTreeHost::SetAnimationEvents(
 526     scoped_ptr<AnimationEventsVector> events) {
 527   DCHECK(proxy_->IsMainThread());
 528   if (animation_host_)
 529     animation_host_->SetAnimationEvents(events.Pass());
 530   else
 531     animation_registrar_->SetAnimationEvents(events.Pass());
 532 }
 533
 534 void LayerTreeHost::SetRootLayer(scoped_refptr<Layer> root_layer) {
 535   if (root_layer_.get() == root_layer.get())
 536     return;
 537
 538   if (root_layer_.get())
 539     root_layer_->SetLayerTreeHost(NULL);
 540   root_layer_ = root_layer;
 541   if (root_layer_.get()) {
 542     DCHECK(!root_layer_->parent());
 543     root_layer_->SetLayerTreeHost(this);
 544   }
 545
 546   if (hud_layer_.get())
 547     hud_layer_->RemoveFromParent();
 548
 549   // Reset gpu rasterization flag.
 550   // This flag is sticky until a new tree comes along.
 551   content_is_suitable_for_gpu_rasterization_ = true;
 552   gpu_rasterization_histogram_recorded_ = false;
 553
 554   SetNeedsFullTreeSync();
 555 }
 556
 557 void LayerTreeHost::SetDebugState(const LayerTreeDebugState& debug_state) {
 558   LayerTreeDebugState new_debug_state =
 559       LayerTreeDebugState::Unite(settings_.initial_debug_state, debug_state);
 560
 561   if (LayerTreeDebugState::Equal(debug_state_, new_debug_state))
 562     return;
 563
 564   debug_state_ = new_debug_state;
 565
 566   rendering_stats_instrumentation_->set_record_rendering_stats(
 567       debug_state_.RecordRenderingStats());
 568
 569   SetNeedsCommit();
 570   proxy_->SetDebugState(debug_state);
 571 }
 572
 573 void LayerTreeHost::SetHasGpuRasterizationTrigger(bool has_trigger) {
 574   if (has_trigger == has_gpu_rasterization_trigger_)
 575     return;
 576
 577   has_gpu_rasterization_trigger_ = has_trigger;
 578   TRACE_EVENT_INSTANT1("cc",
 579                        "LayerTreeHost::SetHasGpuRasterizationTrigger",
 580                        TRACE_EVENT_SCOPE_THREAD,
 581                        "has_trigger",
 582                        has_gpu_rasterization_trigger_);
 583 }
 584
 585 void LayerTreeHost::SetViewportSize(const gfx::Size& device_viewport_size) {
 586   if (device_viewport_size == device_viewport_size_)
 587     return;
 588
 589   device_viewport_size_ = device_viewport_size;
 590
 591   property_trees_.needs_rebuild = true;
 592   SetNeedsCommit();
 593 }
 594
 595 void LayerTreeHost::SetTopControlsHeight(float height, bool shrink) {
 596   if (top_controls_height_ == height &&
 597       top_controls_shrink_blink_size_ == shrink)
 598     return;
 599
 600   top_controls_height_ = height;
 601   top_controls_shrink_blink_size_ = shrink;
 602   SetNeedsCommit();
 603 }
 604
 605 void LayerTreeHost::SetTopControlsShownRatio(float ratio) {
 606   if (top_controls_shown_ratio_ == ratio)
 607     return;
 608
 609   top_controls_shown_ratio_ = ratio;
 610   SetNeedsCommit();
 611 }
 612
 613 void LayerTreeHost::ApplyPageScaleDeltaFromImplSide(float page_scale_delta) {
 614   DCHECK(CommitRequested());
 615   if (page_scale_delta == 1.f)
 616     return;
 617   page_scale_factor_ *= page_scale_delta;
 618   property_trees_.needs_rebuild = true;
 619 }
 620
 621 void LayerTreeHost::SetPageScaleFactorAndLimits(float page_scale_factor,
 622                                                 float min_page_scale_factor,
 623                                                 float max_page_scale_factor) {
 624   if (page_scale_factor == page_scale_factor_ &&
 625       min_page_scale_factor == min_page_scale_factor_ &&
 626       max_page_scale_factor == max_page_scale_factor_)
 627     return;
 628
 629   page_scale_factor_ = page_scale_factor;
 630   min_page_scale_factor_ = min_page_scale_factor;
 631   max_page_scale_factor_ = max_page_scale_factor;
 632   property_trees_.needs_rebuild = true;
 633   SetNeedsCommit();
 634 }
 635
 636 void LayerTreeHost::SetVisible(bool visible) {
 637   if (visible_ == visible)
 638     return;
 639   visible_ = visible;
 640   if (!visible)
 641     ReduceMemoryUsage();
 642   proxy_->SetVisible(visible);
 643 }
 644
 645 void LayerTreeHost::SetThrottleFrameProduction(bool throttle) {
 646   proxy_->SetThrottleFrameProduction(throttle);
 647 }
 648
 649 void LayerTreeHost::StartPageScaleAnimation(const gfx::Vector2d& target_offset,
 650                                             bool use_anchor,
 651                                             float scale,
 652                                             base::TimeDelta duration) {
 653   pending_page_scale_animation_.reset(
 654       new PendingPageScaleAnimation(
 655           target_offset,
 656           use_anchor,
 657           scale,
 658           duration));
 659
 660   SetNeedsCommit();
 661 }
 662
 663 void LayerTreeHost::NotifyInputThrottledUntilCommit() {
 664   proxy_->NotifyInputThrottledUntilCommit();
 665 }
 666
 667 void LayerTreeHost::LayoutAndUpdateLayers() {
 668   DCHECK(!proxy_->HasImplThread());
 669   // This function is only valid when not using the scheduler.
 670   DCHECK(!settings_.single_thread_proxy_scheduler);
 671   SingleThreadProxy* proxy = static_cast<SingleThreadProxy*>(proxy_.get());
 672
 673   SetLayerTreeHostClientReady();
 674   proxy->LayoutAndUpdateLayers();
 675 }
 676
 677 void LayerTreeHost::Composite(base::TimeTicks frame_begin_time) {
 678   DCHECK(!proxy_->HasImplThread());
 679   // This function is only valid when not using the scheduler.
 680   DCHECK(!settings_.single_thread_proxy_scheduler);
 681   SingleThreadProxy* proxy = static_cast<SingleThreadProxy*>(proxy_.get());
 682
 683   SetLayerTreeHostClientReady();
 684   proxy->CompositeImmediately(frame_begin_time);
 685 }
 686
 687 bool LayerTreeHost::UpdateLayers() {
 688   DCHECK(!output_surface_lost_);
 689   if (!root_layer())
 690     return false;
 691   DCHECK(!root_layer()->parent());
 692   bool result = DoUpdateLayers(root_layer());
 693   micro_benchmark_controller_.DidUpdateLayers();
 694   return result || next_commit_forces_redraw_;
 695 }
 696
 697 void LayerTreeHost::DidCompletePageScaleAnimation() {
 698   did_complete_scale_animation_ = true;
 699 }
 700
 701 static Layer* FindFirstScrollableLayer(Layer* layer) {
 702   if (!layer)
 703     return NULL;
 704
 705   if (layer->scrollable())
 706     return layer;
 707
 708   for (size_t i = 0; i < layer->children().size(); ++i) {
 709     Layer* found = FindFirstScrollableLayer(layer->children()[i].get());
 710     if (found)
 711       return found;
 712   }
 713
 714   return NULL;
 715 }
 716
 717 void LayerTreeHost::RecordGpuRasterizationHistogram() {
 718   // Gpu rasterization is only supported for Renderer compositors.
 719   // Checking for proxy_->HasImplThread() to exclude Browser compositors.
 720   if (gpu_rasterization_histogram_recorded_ || !proxy_->HasImplThread())
 721     return;
 722
 723   // Record how widely gpu rasterization is enabled.
 724   // This number takes device/gpu whitelisting/backlisting into account.
 725   // Note that we do not consider the forced gpu rasterization mode, which is
 726   // mostly used for debugging purposes.
 727   UMA_HISTOGRAM_BOOLEAN("Renderer4.GpuRasterizationEnabled",
 728                         settings_.gpu_rasterization_enabled);
 729   if (settings_.gpu_rasterization_enabled) {
 730     UMA_HISTOGRAM_BOOLEAN("Renderer4.GpuRasterizationTriggered",
 731                           has_gpu_rasterization_trigger_);
 732     UMA_HISTOGRAM_BOOLEAN("Renderer4.GpuRasterizationSuitableContent",
 733                           content_is_suitable_for_gpu_rasterization_);
 734     // Record how many pages actually get gpu rasterization when enabled.
 735     UMA_HISTOGRAM_BOOLEAN("Renderer4.GpuRasterizationUsed",
 736                           (has_gpu_rasterization_trigger_ &&
 737                            content_is_suitable_for_gpu_rasterization_));
 738   }
 739
 740   gpu_rasterization_histogram_recorded_ = true;
 741 }
 742
 743 bool LayerTreeHost::UsingSharedMemoryResources() {
 744   return GetRendererCapabilities().using_shared_memory_resources;
 745 }
 746
 747 bool LayerTreeHost::DoUpdateLayers(Layer* root_layer) {
 748   TRACE_EVENT1("cc", "LayerTreeHost::DoUpdateLayers", "source_frame_number",
 749                source_frame_number());
 750
 751   UpdateHudLayer();
 752
 753   Layer* root_scroll = FindFirstScrollableLayer(root_layer);
 754   Layer* page_scale_layer = page_scale_layer_.get();
 755   if (!page_scale_layer && root_scroll)
 756     page_scale_layer = root_scroll->parent();
 757
 758   if (hud_layer_.get()) {
 759     hud_layer_->PrepareForCalculateDrawProperties(device_viewport_size(),
 760                                                   device_scale_factor_);
 761   }
 762
 763   bool can_render_to_separate_surface = true;
 764
 765   TRACE_EVENT0("cc", "LayerTreeHost::UpdateLayers::CalcDrawProps");
 766
 767   LayerTreeHostCommon::PreCalculateMetaInformation(root_layer);
 768
 769   bool preserves_2d_axis_alignment = false;
 770   gfx::Transform identity_transform;
 771   LayerList update_layer_list;
 772
 773   LayerTreeHostCommon::UpdateRenderSurfaces(
 774       root_layer, can_render_to_separate_surface, identity_transform,
 775       preserves_2d_axis_alignment);
 776   {
 777     TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("cc.debug.cdp-perf"),
 778                  "LayerTreeHostCommon::ComputeVisibleRectsWithPropertyTrees");
 779     BuildPropertyTreesAndComputeVisibleRects(
 780         root_layer, page_scale_layer, inner_viewport_scroll_layer_.get(),
 781         outer_viewport_scroll_layer_.get(), page_scale_factor_,
 782         device_scale_factor_, gfx::Rect(device_viewport_size_),
 783         identity_transform, &property_trees_, &update_layer_list);
 784   }
 785
 786   for (const auto& layer : update_layer_list)
 787     layer->SavePaintProperties();
 788
 789   base::AutoReset<bool> painting(&in_paint_layer_contents_, true);
 790   bool did_paint_content = false;
 791   for (const auto& layer : update_layer_list) {
 792     // TODO(enne): temporarily clobber draw properties visible rect.
 793     layer->draw_properties().visible_layer_rect =
 794         layer->visible_rect_from_property_trees();
 795     did_paint_content |= layer->Update();
 796     content_is_suitable_for_gpu_rasterization_ &=
 797         layer->IsSuitableForGpuRasterization();
 798   }
 799   return did_paint_content;
 800 }
 801
 802 void LayerTreeHost::ReduceMemoryUsage() {
 803   if (!root_layer())
 804     return;
 805
 806   LayerTreeHostCommon::CallFunctionForSubtree(
 807       root_layer(), [](Layer* layer) { layer->ReduceMemoryUsage(); });
 808 }
 809
 810 void LayerTreeHost::ApplyScrollAndScale(ScrollAndScaleSet* info) {
 811   ScopedPtrVector<SwapPromise>::iterator it = info->swap_promises.begin();
 812   for (; it != info->swap_promises.end(); ++it) {
 813     scoped_ptr<SwapPromise> swap_promise(info->swap_promises.take(it));
 814     TRACE_EVENT_FLOW_STEP0("input",
 815                            "LatencyInfo.Flow",
 816                            TRACE_ID_DONT_MANGLE(swap_promise->TraceId()),
 817                            "Main thread scroll update");
 818     QueueSwapPromise(swap_promise.Pass());
 819   }
 820
 821   gfx::Vector2dF inner_viewport_scroll_delta;
 822   gfx::Vector2dF outer_viewport_scroll_delta;
 823
 824   if (root_layer_.get()) {
 825     for (size_t i = 0; i < info->scrolls.size(); ++i) {
 826       Layer* layer = LayerTreeHostCommon::FindLayerInSubtree(
 827           root_layer_.get(), info->scrolls[i].layer_id);
 828       if (!layer)
 829         continue;
 830       if (layer == outer_viewport_scroll_layer_.get()) {
 831         outer_viewport_scroll_delta += info->scrolls[i].scroll_delta;
 832       } else if (layer == inner_viewport_scroll_layer_.get()) {
 833         inner_viewport_scroll_delta += info->scrolls[i].scroll_delta;
 834       } else {
 835         layer->SetScrollOffsetFromImplSide(
 836             gfx::ScrollOffsetWithDelta(layer->scroll_offset(),
 837                                        info->scrolls[i].scroll_delta));
 838       }
 839     }
 840   }
 841
 842   if (!inner_viewport_scroll_delta.IsZero() ||
 843       !outer_viewport_scroll_delta.IsZero() || info->page_scale_delta != 1.f ||
 844       !info->elastic_overscroll_delta.IsZero() || info->top_controls_delta) {
 845     // Preemptively apply the scroll offset and scale delta here before sending
 846     // it to the client.  If the client comes back and sets it to the same
 847     // value, then the layer can early out without needing a full commit.
 848     if (inner_viewport_scroll_layer_.get()) {
 849       inner_viewport_scroll_layer_->SetScrollOffsetFromImplSide(
 850           gfx::ScrollOffsetWithDelta(
 851               inner_viewport_scroll_layer_->scroll_offset(),
 852               inner_viewport_scroll_delta));
 853     }
 854
 855     if (outer_viewport_scroll_layer_.get()) {
 856       outer_viewport_scroll_layer_->SetScrollOffsetFromImplSide(
 857           gfx::ScrollOffsetWithDelta(
 858               outer_viewport_scroll_layer_->scroll_offset(),
 859               outer_viewport_scroll_delta));
 860     }
 861
 862     ApplyPageScaleDeltaFromImplSide(info->page_scale_delta);
 863     elastic_overscroll_ += info->elastic_overscroll_delta;
 864     // TODO(ccameron): pass the elastic overscroll here so that input events
 865     // may be translated appropriately.
 866     client_->ApplyViewportDeltas(
 867         inner_viewport_scroll_delta, outer_viewport_scroll_delta,
 868         info->elastic_overscroll_delta, info->page_scale_delta,
 869         info->top_controls_delta);
 870   }
 871 }
 872
 873 void LayerTreeHost::StartRateLimiter() {
 874   if (inside_begin_main_frame_)
 875     return;
 876
 877   if (!rate_limit_timer_.IsRunning()) {
 878     rate_limit_timer_.Start(FROM_HERE,
 879                             base::TimeDelta(),
 880                             this,
 881                             &LayerTreeHost::RateLimit);
 882   }
 883 }
 884
 885 void LayerTreeHost::StopRateLimiter() {
 886   rate_limit_timer_.Stop();
 887 }
 888
 889 void LayerTreeHost::RateLimit() {
 890   // Force a no-op command on the compositor context, so that any ratelimiting
 891   // commands will wait for the compositing context, and therefore for the
 892   // SwapBuffers.
 893   proxy_->ForceSerializeOnSwapBuffers();
 894   client_->RateLimitSharedMainThreadContext();
 895 }
 896
 897 void LayerTreeHost::SetDeviceScaleFactor(float device_scale_factor) {
 898   if (device_scale_factor == device_scale_factor_)
 899     return;
 900   device_scale_factor_ = device_scale_factor;
 901
 902   property_trees_.needs_rebuild = true;
 903   SetNeedsCommit();
 904 }
 905
 906 void LayerTreeHost::UpdateTopControlsState(TopControlsState constraints,
 907                                            TopControlsState current,
 908                                            bool animate) {
 909   // Top controls are only used in threaded mode.
 910   proxy_->ImplThreadTaskRunner()->PostTask(
 911       FROM_HERE,
 912       base::Bind(&TopControlsManager::UpdateTopControlsState,
 913                  top_controls_manager_weak_ptr_,
 914                  constraints,
 915                  current,
 916                  animate));
 917 }
 918
 919 void LayerTreeHost::AnimateLayers(base::TimeTicks monotonic_time) {
 920   if (!settings_.accelerated_animation_enabled)
 921     return;
 922
 923   AnimationEventsVector events;
 924   if (animation_host_) {
 925     if (animation_host_->AnimateLayers(monotonic_time))
 926       animation_host_->UpdateAnimationState(true, &events);
 927   } else {
 928     if (animation_registrar_->AnimateLayers(monotonic_time))
 929       animation_registrar_->UpdateAnimationState(true, &events);
 930   }
 931
 932   if (!events.empty())
 933     property_trees_.needs_rebuild = true;
 934 }
 935
 936 UIResourceId LayerTreeHost::CreateUIResource(UIResourceClient* client) {
 937   DCHECK(client);
 938
 939   UIResourceId next_id = next_ui_resource_id_++;
 940   DCHECK(ui_resource_client_map_.find(next_id) ==
 941          ui_resource_client_map_.end());
 942
 943   bool resource_lost = false;
 944   UIResourceRequest request(UIResourceRequest::UI_RESOURCE_CREATE, next_id,
 945                             client->GetBitmap(next_id, resource_lost));
 946   ui_resource_request_queue_.push_back(request);
 947
 948   UIResourceClientData data;
 949   data.client = client;
 950   data.size = request.GetBitmap().GetSize();
 951
 952   ui_resource_client_map_[request.GetId()] = data;
 953   return request.GetId();
 954 }
 955
 956 // Deletes a UI resource.  May safely be called more than once.
 957 void LayerTreeHost::DeleteUIResource(UIResourceId uid) {
 958   UIResourceClientMap::iterator iter = ui_resource_client_map_.find(uid);
 959   if (iter == ui_resource_client_map_.end())
 960     return;
 961
 962   UIResourceRequest request(UIResourceRequest::UI_RESOURCE_DELETE, uid);
 963   ui_resource_request_queue_.push_back(request);
 964   ui_resource_client_map_.erase(iter);
 965 }
 966
 967 void LayerTreeHost::RecreateUIResources() {
 968   for (UIResourceClientMap::iterator iter = ui_resource_client_map_.begin();
 969        iter != ui_resource_client_map_.end();
 970        ++iter) {
 971     UIResourceId uid = iter->first;
 972     const UIResourceClientData& data = iter->second;
 973     bool resource_lost = true;
 974     UIResourceRequest request(UIResourceRequest::UI_RESOURCE_CREATE, uid,
 975                               data.client->GetBitmap(uid, resource_lost));
 976     ui_resource_request_queue_.push_back(request);
 977   }
 978 }
 979
 980 // Returns the size of a resource given its id.
 981 gfx::Size LayerTreeHost::GetUIResourceSize(UIResourceId uid) const {
 982   UIResourceClientMap::const_iterator iter = ui_resource_client_map_.find(uid);
 983   if (iter == ui_resource_client_map_.end())
 984     return gfx::Size();
 985
 986   const UIResourceClientData& data = iter->second;
 987   return data.size;
 988 }
 989
 990 void LayerTreeHost::RegisterViewportLayers(
 991     scoped_refptr<Layer> overscroll_elasticity_layer,
 992     scoped_refptr<Layer> page_scale_layer,
 993     scoped_refptr<Layer> inner_viewport_scroll_layer,
 994     scoped_refptr<Layer> outer_viewport_scroll_layer) {
 995   overscroll_elasticity_layer_ = overscroll_elasticity_layer;
 996   page_scale_layer_ = page_scale_layer;
 997   inner_viewport_scroll_layer_ = inner_viewport_scroll_layer;
 998   outer_viewport_scroll_layer_ = outer_viewport_scroll_layer;
 999 }
1000
1001 void LayerTreeHost::RegisterSelection(const LayerSelection& selection) {
1002   if (selection_ == selection)
1003     return;
1004
1005   selection_ = selection;
1006   SetNeedsCommit();
1007 }
1008
1009 int LayerTreeHost::ScheduleMicroBenchmark(
1010     const std::string& benchmark_name,
1011     scoped_ptr<base::Value> value,
1012     const MicroBenchmark::DoneCallback& callback) {
1013   return micro_benchmark_controller_.ScheduleRun(
1014       benchmark_name, value.Pass(), callback);
1015 }
1016
1017 bool LayerTreeHost::SendMessageToMicroBenchmark(int id,
1018                                                 scoped_ptr<base::Value> value) {
1019   return micro_benchmark_controller_.SendMessage(id, value.Pass());
1020 }
1021
1022 void LayerTreeHost::InsertSwapPromiseMonitor(SwapPromiseMonitor* monitor) {
1023   swap_promise_monitor_.insert(monitor);
1024 }
1025
1026 void LayerTreeHost::RemoveSwapPromiseMonitor(SwapPromiseMonitor* monitor) {
1027   swap_promise_monitor_.erase(monitor);
1028 }
1029
1030 void LayerTreeHost::NotifySwapPromiseMonitorsOfSetNeedsCommit() {
1031   std::set<SwapPromiseMonitor*>::iterator it = swap_promise_monitor_.begin();
1032   for (; it != swap_promise_monitor_.end(); it++)
1033     (*it)->OnSetNeedsCommitOnMain();
1034 }
1035
1036 void LayerTreeHost::QueueSwapPromise(scoped_ptr<SwapPromise> swap_promise) {
1037   DCHECK(swap_promise);
1038   swap_promise_list_.push_back(swap_promise.Pass());
1039 }
1040
1041 void LayerTreeHost::BreakSwapPromises(SwapPromise::DidNotSwapReason reason) {
1042   for (auto* swap_promise : swap_promise_list_)
1043     swap_promise->DidNotSwap(reason);
1044   swap_promise_list_.clear();
1045 }
1046
1047 void LayerTreeHost::OnCommitForSwapPromises() {
1048   for (auto* swap_promise : swap_promise_list_)
1049     swap_promise->OnCommit();
1050 }
1051
1052 void LayerTreeHost::set_surface_id_namespace(uint32_t id_namespace) {
1053   surface_id_namespace_ = id_namespace;
1054 }
1055
1056 SurfaceSequence LayerTreeHost::CreateSurfaceSequence() {
1057   return SurfaceSequence(surface_id_namespace_, next_surface_sequence_++);
1058 }
1059
1060 void LayerTreeHost::SetChildrenNeedBeginFrames(
1061     bool children_need_begin_frames) const {
1062   proxy_->SetChildrenNeedBeginFrames(children_need_begin_frames);
1063 }
1064
1065 void LayerTreeHost::SendBeginFramesToChildren(
1066     const BeginFrameArgs& args) const {
1067   client_->SendBeginFramesToChildren(args);
1068 }
1069
1070 void LayerTreeHost::SetAuthoritativeVSyncInterval(
1071     const base::TimeDelta& interval) {
1072   proxy_->SetAuthoritativeVSyncInterval(interval);
1073 }
1074
1075 void LayerTreeHost::RecordFrameTimingEvents(
1076     scoped_ptr<FrameTimingTracker::CompositeTimingSet> composite_events,
1077     scoped_ptr<FrameTimingTracker::MainFrameTimingSet> main_frame_events) {
1078   client_->RecordFrameTimingEvents(composite_events.Pass(),
1079                                    main_frame_events.Pass());
1080 }
1081
1082 Layer* LayerTreeHost::LayerById(int id) const {
1083   LayerIdMap::const_iterator iter = layer_id_map_.find(id);
1084   return iter != layer_id_map_.end() ? iter->second : NULL;
1085 }
1086
1087 void LayerTreeHost::RegisterLayer(Layer* layer) {
1088   DCHECK(!LayerById(layer->id()));
1089   DCHECK(!in_paint_layer_contents_);
1090   layer_id_map_[layer->id()] = layer;
1091   if (animation_host_)
1092     animation_host_->RegisterLayer(layer->id(), LayerTreeType::ACTIVE);
1093 }
1094
1095 void LayerTreeHost::UnregisterLayer(Layer* layer) {
1096   DCHECK(LayerById(layer->id()));
1097   DCHECK(!in_paint_layer_contents_);
1098   if (animation_host_)
1099     animation_host_->UnregisterLayer(layer->id(), LayerTreeType::ACTIVE);
1100   layer_id_map_.erase(layer->id());
1101 }
1102
1103 bool LayerTreeHost::IsLayerInTree(int layer_id, LayerTreeType tree_type) const {
1104   return tree_type == LayerTreeType::ACTIVE;
1105 }
1106
1107 void LayerTreeHost::SetMutatorsNeedCommit() {
1108   SetNeedsCommit();
1109 }
1110
1111 void LayerTreeHost::SetLayerFilterMutated(int layer_id,
1112                                           LayerTreeType tree_type,
1113                                           const FilterOperations& filters) {
1114   LayerAnimationValueObserver* layer = LayerById(layer_id);
1115   DCHECK(layer);
1116   layer->OnFilterAnimated(filters);
1117 }
1118
1119 void LayerTreeHost::SetLayerOpacityMutated(int layer_id,
1120                                            LayerTreeType tree_type,
1121                                            float opacity) {
1122   LayerAnimationValueObserver* layer = LayerById(layer_id);
1123   DCHECK(layer);
1124   layer->OnOpacityAnimated(opacity);
1125 }
1126
1127 void LayerTreeHost::SetLayerTransformMutated(int layer_id,
1128                                              LayerTreeType tree_type,
1129                                              const gfx::Transform& transform) {
1130   LayerAnimationValueObserver* layer = LayerById(layer_id);
1131   DCHECK(layer);
1132   layer->OnTransformAnimated(transform);
1133 }
1134
1135 void LayerTreeHost::SetLayerScrollOffsetMutated(
1136     int layer_id,
1137     LayerTreeType tree_type,
1138     const gfx::ScrollOffset& scroll_offset) {
1139   LayerAnimationValueObserver* layer = LayerById(layer_id);
1140   DCHECK(layer);
1141   layer->OnScrollOffsetAnimated(scroll_offset);
1142 }
1143
1144 void LayerTreeHost::LayerTransformIsPotentiallyAnimatingChanged(
1145     int layer_id,
1146     LayerTreeType tree_type,
1147     bool is_animating) {
1148   LayerAnimationValueObserver* layer = LayerById(layer_id);
1149   DCHECK(layer);
1150   layer->OnTransformIsPotentiallyAnimatingChanged(is_animating);
1151 }
1152
1153 gfx::ScrollOffset LayerTreeHost::GetScrollOffsetForAnimation(
1154     int layer_id) const {
1155   LayerAnimationValueProvider* layer = LayerById(layer_id);
1156   DCHECK(layer);
1157   return layer->ScrollOffsetForAnimation();
1158 }
1159
1160 bool LayerTreeHost::ScrollOffsetAnimationWasInterrupted(
1161     const Layer* layer) const {
1162   return animation_host_
1163              ? animation_host_->ScrollOffsetAnimationWasInterrupted(layer->id())
1164              : false;
1165 }
1166
1167 bool LayerTreeHost::IsAnimatingFilterProperty(const Layer* layer) const {
1168   return animation_host_
1169              ? animation_host_->IsAnimatingFilterProperty(layer->id(),
1170                                                           LayerTreeType::ACTIVE)
1171              : false;
1172 }
1173
1174 bool LayerTreeHost::IsAnimatingOpacityProperty(const Layer* layer) const {
1175   return animation_host_
1176              ? animation_host_->IsAnimatingOpacityProperty(
1177                    layer->id(), LayerTreeType::ACTIVE)
1178              : false;
1179 }
1180
1181 bool LayerTreeHost::IsAnimatingTransformProperty(const Layer* layer) const {
1182   return animation_host_
1183              ? animation_host_->IsAnimatingTransformProperty(
1184                    layer->id(), LayerTreeType::ACTIVE)
1185              : false;
1186 }
1187
1188 bool LayerTreeHost::HasPotentiallyRunningFilterAnimation(
1189     const Layer* layer) const {
1190   return animation_host_
1191              ? animation_host_->HasPotentiallyRunningFilterAnimation(
1192                    layer->id(), LayerTreeType::ACTIVE)
1193              : false;
1194 }
1195
1196 bool LayerTreeHost::HasPotentiallyRunningOpacityAnimation(
1197     const Layer* layer) const {
1198   return animation_host_
1199              ? animation_host_->HasPotentiallyRunningOpacityAnimation(
1200                    layer->id(), LayerTreeType::ACTIVE)
1201              : false;
1202 }
1203
1204 bool LayerTreeHost::HasPotentiallyRunningTransformAnimation(
1205     const Layer* layer) const {
1206   return animation_host_
1207              ? animation_host_->HasPotentiallyRunningTransformAnimation(
1208                    layer->id(), LayerTreeType::ACTIVE)
1209              : false;
1210 }
1211
1212 bool LayerTreeHost::HasAnyAnimationTargetingProperty(
1213     const Layer* layer,
1214     Animation::TargetProperty property) const {
1215   return animation_host_
1216              ? animation_host_->HasAnyAnimationTargetingProperty(layer->id(),
1217                                                                  property)
1218              : false;
1219 }
1220
1221 bool LayerTreeHost::AnimationsPreserveAxisAlignment(const Layer* layer) const {
1222   return animation_host_
1223              ? animation_host_->AnimationsPreserveAxisAlignment(layer->id())
1224              : true;
1225 }
1226
1227 bool LayerTreeHost::HasAnyAnimation(const Layer* layer) const {
1228   return animation_host_ ? animation_host_->HasAnyAnimation(layer->id())
1229                          : false;
1230 }
1231
1232 bool LayerTreeHost::HasActiveAnimation(const Layer* layer) const {
1233   return animation_host_ ? animation_host_->HasActiveAnimation(layer->id())
1234                          : false;
1235 }
1236
1237 }  // namespace cc