Schedule bitmap animation timers on the compositor task runner.

third_party/WebKit/Source/platform/scheduler/renderer/web_frame_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/web_frame_scheduler_impl.h"
 
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/blame_context.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/scheduler/base/real_time_domain.h"
@@ skipping 178 matching lines @@
   if (!unthrottled_web_task_runner_) {
     unthrottled_task_queue_ = renderer_scheduler_->NewUnthrottledTaskQueue(
         TaskQueue::QueueType::FRAME_UNTHROTTLED);
     unthrottled_task_queue_->SetBlameContext(blame_context_);
     unthrottled_web_task_runner_ =
         WebTaskRunnerImpl::Create(unthrottled_task_queue_);
   }
   return unthrottled_web_task_runner_;
 }
 
+RefPtr<blink::WebTaskRunner> WebFrameSchedulerImpl::CompositorTaskRunner() {
+  return WebTaskRunnerImpl::Create(renderer_scheduler_->CompositorTaskQueue());
+}
+
 blink::WebViewScheduler* WebFrameSchedulerImpl::GetWebViewScheduler() {
   return parent_web_view_scheduler_;
 }
 
 void WebFrameSchedulerImpl::DidStartLoading(unsigned long identifier) {
   if (parent_web_view_scheduler_)
     parent_web_view_scheduler_->DidStartLoading(identifier);
 }
 
 void WebFrameSchedulerImpl::DidStopLoading(unsigned long identifier) {
@@ skipping 102 matching lines @@
         timer_task_queue_.get());
   }
 }
 
 base::WeakPtr<WebFrameSchedulerImpl> WebFrameSchedulerImpl::AsWeakPtr() {
   return weak_factory_.GetWeakPtr();
 }
 
 }  // namespace scheduler
 }  // namespace blink