Read compositor VSync information from platform, when possible

cc/output/output_surface.cc

 // Copyright (c) 2013 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.
 
 #include "cc/output/output_surface.h"
 
 #include <algorithm>
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 99 matching lines @@
   for (int i = 0; i < pending_swap_buffers_; i++)
     frame_rate_controller_->DidSwapBuffers();
 }
 
 void OutputSurface::SetMaxFramesPending(int max_frames_pending) {
   if (frame_rate_controller_)
     frame_rate_controller_->SetMaxSwapsPending(max_frames_pending);
   max_frames_pending_ = max_frames_pending;
 }
 
-void OutputSurface::OnVSyncParametersChanged(base::TimeTicks timebase,
-                                             base::TimeDelta interval) {
-  TRACE_EVENT2("cc", "OutputSurface::OnVSyncParametersChanged",
-               "timebase", (timebase - base::TimeTicks()).InSecondsF(),
-               "interval", interval.InSecondsF());
+void OutputSurface::CommitVSyncParameters(base::TimeTicks timebase,
+                                          base::TimeDelta interval) {
+  TRACE_EVENT2("cc",
+               "OutputSurface::CommitVSyncParameters",
+               "timebase",
+               (timebase - base::TimeTicks()).InSecondsF(),
+               "interval",
+               interval.InSecondsF());
   if (frame_rate_controller_)
     frame_rate_controller_->SetTimebaseAndInterval(timebase, interval);
 }
 
 void OutputSurface::FrameRateControllerTick(bool throttled,
                                             const BeginFrameArgs& args) {
   DCHECK(frame_rate_controller_);
   if (throttled)
     skipped_begin_impl_frame_args_ = args;
   else
@@ skipping 348 matching lines @@
   TRACE_EVENT1("cc", "OutputSurface::SetMemoryPolicy",
                "bytes_limit_when_visible", policy.bytes_limit_when_visible);
   // Just ignore the memory manager when it says to set the limit to zero
   // bytes. This will happen when the memory manager thinks that the renderer
   // is not visible (which the renderer knows better).
   if (policy.bytes_limit_when_visible)
     client_->SetMemoryPolicy(policy);
 }
 
 }  // namespace cc