cc: Add main frame timing info to frame timing tracker.

cc/scheduler/scheduler.h

Index: cc/scheduler/scheduler.h
diff --git a/cc/scheduler/scheduler.h b/cc/scheduler/scheduler.h
index 8ed584a5d49a7c6492eeef1e37043c538e1d7ecd..49e7091e40297e50048623ad2b930a0704c5c891 100644
--- a/cc/scheduler/scheduler.h
+++ b/cc/scheduler/scheduler.h
@@ -153,7 +153,8 @@ class CC_EXPORT Scheduler : public BeginFrameObserverMixIn {
 
   void NotifyBeginMainFrameStarted();
 
-  base::TimeTicks LastBeginImplFrameTime();
+  base::TimeTicks LastBeginImplFrameTime() const;
+  base::TimeTicks NextBeginImplFrameTimeIfRequested() const;

[mithro-old, 2015/03/11 04:01:33]

Why do you need the NextBeginImplFrameTime? At the moment the value you are
returning is a *extremely rough* approximate to the next BeginImplFrameTime
value.

[vmpstr, 2015/03/16 18:36:43]

The value that I need to get is the rAF time if rAF was scheduled this frame. I
understand that this is a rough estimate and a variety of things can cause the
actual raf time to be further (eg process being descheduled). Do you know of a
better estimate I can use short of actually scheduling a rAF only for the
purposes of getting this time?

 
   void SetDeferCommits(bool defer_commits);