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

cc/trees/layer_tree_host.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_LAYER_TREE_HOST_H_
 #define CC_TREES_LAYER_TREE_HOST_H_
 
 #include <limits>
 #include <set>
 #include <string>
@@ skipping 97 matching lines @@
   virtual ~LayerTreeHost();
 
   void SetLayerTreeHostClientReady();
 
   // LayerTreeHost interface to Proxy.
   void WillBeginMainFrame() {
     client_->WillBeginMainFrame(source_frame_number_);
   }
   void DidBeginMainFrame();
   void BeginMainFrame(const BeginFrameArgs& args);
+  void BeginMainFrameNoLongerRequired();
   void AnimateLayers(base::TimeTicks monotonic_frame_begin_time);
   void DidStopFlinging();
   void Layout();
   void BeginCommitOnImplThread(LayerTreeHostImpl* host_impl);
   void FinishCommitOnImplThread(LayerTreeHostImpl* host_impl);
   void WillCommit();
   void CommitComplete();
   void SetOutputSurface(scoped_ptr<OutputSurface> output_surface);
   void RequestNewOutputSurface();
   void DidInitializeOutputSurface();
@@ skipping 354 matching lines @@
 
   uint32_t surface_id_namespace_;
   uint32_t next_surface_sequence_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHost);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_H_