Create a new action triggered when a BeginMainFrame is not expected before vsync

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 <stddef.h>
 #include <stdint.h>
 
@@ skipping 372 matching lines @@
   LayerListIterator<Layer> begin() const;
   LayerListIterator<Layer> end() const;
   LayerListReverseIterator<Layer> rbegin();
   LayerListReverseIterator<Layer> rend();
 
   // LayerTreeHostInProcess interface to Proxy.
   void WillBeginMainFrame();
   void DidBeginMainFrame();
   void BeginMainFrame(const BeginFrameArgs& args);
   void BeginMainFrameNotExpectedSoon();
+  void DoShortIdleWork(const BeginFrameArgs& args);
   void AnimateLayers(base::TimeTicks monotonic_frame_begin_time);
   void RequestMainFrameUpdate();
   void FinishCommitOnImplThread(LayerTreeHostImpl* host_impl);
   void WillCommit();
   void CommitComplete();
   void RequestNewCompositorFrameSink();
   void DidInitializeCompositorFrameSink();
   void DidFailToInitializeCompositorFrameSink();
   virtual std::unique_ptr<LayerTreeHostImpl> CreateLayerTreeHostImpl(
       LayerTreeHostImplClient* client);
@@ skipping 218 matching lines @@
 
   std::vector<std::pair<sk_sp<const SkImage>, base::Callback<void(bool)>>>
       queued_image_decodes_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHost);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_H_