cc: Implement unified BeginFrame on aura

cc/scheduler/scheduler.h

Index: cc/scheduler/scheduler.h
diff --git a/cc/scheduler/scheduler.h b/cc/scheduler/scheduler.h
index 370ac25b6c4bf44a5f50db03c7147bae17192a92..3d7797e02af1b5d192ef3f59ae312bb63d633ad2 100644
--- a/cc/scheduler/scheduler.h
+++ b/cc/scheduler/scheduler.h
@@ -174,6 +174,8 @@ class CC_EXPORT Scheduler : public BeginFrameObserverMixIn,
 
   void SetChildrenNeedBeginFrames(bool children_need_begin_frames);
 
+  void SetAuthoritativeVSyncInterval(const base::TimeDelta& interval);
+
  protected:
   Scheduler(SchedulerClient* client,
             const SchedulerSettings& scheduler_settings,
@@ -198,6 +200,9 @@ class CC_EXPORT Scheduler : public BeginFrameObserverMixIn,
   scoped_ptr<BeginFrameSource> unthrottled_frame_source_internal_;
 
   VSyncParameterObserver* vsync_observer_;
+  base::TimeDelta authoritative_vsync_interval_;
+  base::TimeTicks last_timebase_;

[brianderson, 2015/03/02 22:38:15]

last_vsync_timebase_?

[simonhong, 2015/03/03 22:54:11]

Done.

+
   bool throttle_frame_production_;
 
   const SchedulerSettings settings_;