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

cc/trees/layer_tree_host_client.h

 // Copyright 2012 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_CLIENT_H_
 #define CC_TREES_LAYER_TREE_HOST_CLIENT_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 
 namespace gfx {
 class Vector2d;
 class Vector2dF;
 }
 
 namespace cc {
 class ContextProvider;
 class InputHandlerClient;
 class OutputSurface;
 struct BeginFrameArgs;
 
 class LayerTreeHostClient {
  public:
   virtual void WillBeginMainFrame() = 0;
   // Marks finishing compositing-related tasks on the main thread. In threaded
   // mode, this corresponds to DidCommit().
   virtual void BeginMainFrame(const BeginFrameArgs& args) = 0;
+  virtual void BeginMainFrameNotExpectedSoon();
   virtual void DidBeginMainFrame() = 0;
   virtual void Layout() = 0;
   virtual void ApplyViewportDeltas(
       const gfx::Vector2dF& inner_delta,
       const gfx::Vector2dF& outer_delta,
       const gfx::Vector2dF& elastic_overscroll_delta,
       float page_scale,
       float top_controls_delta) = 0;
   virtual void ApplyViewportDeltas(const gfx::Vector2d& scroll_delta,
                                    float page_scale,
@@ skipping 23 matching lines @@
   // a TextureLayer that calls SetRateLimitContext(true).
   virtual void RateLimitSharedMainThreadContext() {}
 
  protected:
   virtual ~LayerTreeHostClient() {}
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_CLIENT_H_