Schedule bitmap animation timers on the compositor task runner.

third_party/WebKit/Source/platform/scheduler/renderer/renderer_web_scheduler_impl.cc

 // Copyright 2015 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 "platform/scheduler/renderer/renderer_web_scheduler_impl.h"
 
 #include <memory>
 
 #include "base/memory/ptr_util.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/scheduler/base/task_queue.h"
 #include "platform/scheduler/renderer/renderer_scheduler_impl.h"
 #include "platform/scheduler/renderer/web_view_scheduler_impl.h"
 
 namespace blink {
 namespace scheduler {
 
 RendererWebSchedulerImpl::RendererWebSchedulerImpl(
     RendererSchedulerImpl* renderer_scheduler)
     : WebSchedulerImpl(renderer_scheduler,
                        renderer_scheduler->IdleTaskRunner(),
                        renderer_scheduler->LoadingTaskQueue(),
                        renderer_scheduler->TimerTaskQueue()),
-      renderer_scheduler_(renderer_scheduler) {}
+      renderer_scheduler_(renderer_scheduler),
+      compositor_task_runner_(WebTaskRunnerImpl::Create(
+          renderer_scheduler_->CompositorTaskQueue())) {}
 
 RendererWebSchedulerImpl::~RendererWebSchedulerImpl() {}
 
+WebTaskRunner* RendererWebSchedulerImpl::CompositorTaskRunner() {
+  return compositor_task_runner_.Get();
+}
+
 void RendererWebSchedulerImpl::SuspendTimerQueue() {
   renderer_scheduler_->SuspendTimerQueue();
 }
 
 void RendererWebSchedulerImpl::ResumeTimerQueue() {
   renderer_scheduler_->ResumeTimerQueue();
 }
 
 std::unique_ptr<blink::WebViewScheduler>
 RendererWebSchedulerImpl::CreateWebViewScheduler(
     InterventionReporter* intervention_reporter,
     WebViewScheduler::WebViewSchedulerSettings* settings) {
   return base::WrapUnique(new WebViewSchedulerImpl(
       intervention_reporter, settings, renderer_scheduler_,
       !blink::RuntimeEnabledFeatures::
           timerThrottlingForBackgroundTabsEnabled()));
 }
 
 }  // namespace scheduler
 }  // namespace blink