[cc]: Add a BeginMainFrameNotExpectedSoon signal and route it to the RendererScheduler.

cc/trees/thread_proxy.h

 // 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.
 
 #ifndef CC_TREES_THREAD_PROXY_H_
 #define CC_TREES_THREAD_PROXY_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 208 matching lines @@
   void ScheduledActionCommit() override;
   void ScheduledActionActivateSyncTree() override;
   void ScheduledActionBeginOutputSurfaceCreation() override;
   void ScheduledActionPrepareTiles() override;
   void DidAnticipatedDrawTimeChange(base::TimeTicks time) override;
   base::TimeDelta DrawDurationEstimate() override;
   base::TimeDelta BeginMainFrameToCommitDurationEstimate() override;
   base::TimeDelta CommitToActivateDurationEstimate() override;
   void DidBeginImplFrameDeadline() override;
   void SendBeginFramesToChildren(const BeginFrameArgs& args) override;
+  void SendBeginMainFrameNoLongerRequired() override;
 
   // ResourceUpdateControllerClient implementation
   void ReadyToFinalizeTextureUpdates() override;
 
  protected:
   ThreadProxy(
       LayerTreeHost* layer_tree_host,
       scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner,
       scoped_ptr<BeginFrameSource> external_begin_frame_source);
 
  private:
   // Called on main thread.
   void SetRendererCapabilitiesMainThreadCopy(
       const RendererCapabilities& capabilities);
   void BeginMainFrame(
       scoped_ptr<BeginMainFrameAndCommitState> begin_main_frame_state);
+  void BeginMainFrameNoLongerRequired();
   void DidCommitAndDrawFrame();
   void DidCompleteSwapBuffers();
   void SetAnimationEvents(scoped_ptr<AnimationEventsVector> queue);
   void DidLoseOutputSurface();
   void RequestNewOutputSurface();
   void DidInitializeOutputSurface(bool success,
                                   const RendererCapabilities& capabilities);
   void SendCommitRequestToImplThreadIfNeeded();
   void DidCompletePageScaleAnimation();
 
@@ skipping 45 matching lines @@
 
   base::WeakPtr<ThreadProxy> main_thread_weak_ptr_;
   base::WeakPtr<ThreadProxy> impl_thread_weak_ptr_;
 
   DISALLOW_COPY_AND_ASSIGN(ThreadProxy);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_THREAD_PROXY_H_