Read compositor VSync information from platform, when possible

cc/output/output_surface.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_OUTPUT_OUTPUT_SURFACE_H_
 #define CC_OUTPUT_OUTPUT_SURFACE_H_
 
 #include <deque>
 
 #include "base/basictypes.h"
@@ skipping 141 matching lines @@
   void PostSwapBuffersComplete();
 
   struct OutputSurface::Capabilities capabilities_;
   scoped_refptr<ContextProvider> context_provider_;
   scoped_ptr<SoftwareOutputDevice> software_device_;
   gfx::Size surface_size_;
   float device_scale_factor_;
 
   // The FrameRateController is deprecated.
   // Platforms should move to native BeginImplFrames instead.
-  void OnVSyncParametersChanged(base::TimeTicks timebase,
-                                base::TimeDelta interval);
+  void CommitVSyncParameters(base::TimeTicks timebase,
+                             base::TimeDelta interval);
   virtual void FrameRateControllerTick(bool throttled,
                                        const BeginFrameArgs& args) OVERRIDE;
   scoped_ptr<FrameRateController> frame_rate_controller_;
   int max_frames_pending_;
   int pending_swap_buffers_;
   bool needs_begin_impl_frame_;
   bool client_ready_for_begin_impl_frame_;
 
   // This stores a BeginImplFrame that we couldn't process immediately,
   // but might process retroactively in the near future.
@@ skipping 37 matching lines @@
   std::deque<unsigned> available_gpu_latency_query_ids_;
   std::deque<unsigned> pending_gpu_latency_query_ids_;
   RollingTimeDeltaHistory gpu_latency_history_;
 
   DISALLOW_COPY_AND_ASSIGN(OutputSurface);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_OUTPUT_SURFACE_H_