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

cc/trees/proxy_main.h

 // 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.
 
 #ifndef CC_TREES_PROXY_MAIN_H_
 #define CC_TREES_PROXY_MAIN_H_
 
 #include "base/macros.h"
 #include "cc/cc_export.h"
 #include "cc/input/browser_controls_state.h"
@@ skipping 24 matching lines @@
   // we decide that no further processing is necessary.
   enum CommitPipelineStage {
     NO_PIPELINE_STAGE,
     ANIMATE_PIPELINE_STAGE,
     UPDATE_LAYERS_PIPELINE_STAGE,
     COMMIT_PIPELINE_STAGE,
   };
 
   void DidReceiveCompositorFrameAck();
   void BeginMainFrameNotExpectedSoon();
+  void DoShortIdleWork(const BeginFrameArgs& args);
   void DidCommitAndDrawFrame();
   void SetAnimationEvents(std::unique_ptr<MutatorEvents> events);
   void DidLoseCompositorFrameSink();
   void RequestNewCompositorFrameSink();
   void DidInitializeCompositorFrameSink(bool success);
   void DidCompletePageScaleAnimation();
   void BeginMainFrame(
       std::unique_ptr<BeginMainFrameAndCommitState> begin_main_frame_state);
 
   CommitPipelineStage max_requested_pipeline_stage() const {
@@ skipping 75 matching lines @@
   std::unique_ptr<ProxyImpl> proxy_impl_;
 
   base::WeakPtrFactory<ProxyMain> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ProxyMain);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_PROXY_MAIN_H_