cc: Measure compositor timing with finer granularity

cc/scheduler/scheduler.h

Index: cc/scheduler/scheduler.h
diff --git a/cc/scheduler/scheduler.h b/cc/scheduler/scheduler.h
index 3bf4f7fd54fcc9e76692552aec2378daefd6235a..967d31b7f5912a192ae32daf6d38f1d1a436db22 100644
--- a/cc/scheduler/scheduler.h
+++ b/cc/scheduler/scheduler.h
@@ -101,7 +101,9 @@ class CC_EXPORT Scheduler : public BeginFrameObserverBase {
 
   void NotifyReadyToCommit();
   void BeginMainFrameAborted(CommitEarlyOutReason reason);
+  void DidCommit();
 
+  void WillPrepareTiles();
   void DidPrepareTiles();
   void DidLoseOutputSurface();
   void DidCreateAndInitializeOutputSurface();
@@ -198,6 +200,7 @@ class CC_EXPORT Scheduler : public BeginFrameObserverBase {
   void DrawAndSwapIfPossible();
   void DrawAndSwapForced();
   void ProcessScheduledActions();
+  void UpdateCompositorTimingHistoryRecordingEnabled();
   bool CanCommitAndActivateBeforeDeadline() const;
   void AdvanceCommitStateIfPossible();
   bool IsBeginMainFrameSentOrStarted() const;