Read compositor VSync information from platform, when possible

cc/output/output_surface.cc

Index: cc/output/output_surface.cc
diff --git a/cc/output/output_surface.cc b/cc/output/output_surface.cc
index 9ba6dbbc1ebde32b6cd0cae24e5fc8ea2b401a84..87d6e84dd1b3dc6b47a0a0616e96ca434ecafff7 100644
--- a/cc/output/output_surface.cc
+++ b/cc/output/output_surface.cc
@@ -117,11 +117,14 @@ void OutputSurface::SetMaxFramesPending(int 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);
 }