Estimate draw duration in SchedulerClient

cc/scheduler/scheduler.h

Index: cc/scheduler/scheduler.h
diff --git a/cc/scheduler/scheduler.h b/cc/scheduler/scheduler.h
index aec0cdf2b56dcb4e801f41af44f165831ae3205d..d3dd8354aa23bd94df02ade935e5fd16133d89d8 100644
--- a/cc/scheduler/scheduler.h
+++ b/cc/scheduler/scheduler.h
@@ -44,6 +44,7 @@ class SchedulerClient {
   virtual void ScheduledActionBeginOutputSurfaceCreation() = 0;
   virtual void ScheduledActionAcquireLayerTexturesForMainThread() = 0;
   virtual void DidAnticipatedDrawTimeChange(base::TimeTicks time) = 0;
+  virtual base::TimeDelta DrawDurationEstimate() = 0;

[ajuma, 2013/06/06 18:00:35]

I'm adding this to SchedulerClient rather than to Scheduler since we eventually
want to include GPU process execution time in the estimate, and plumbing this to
the SchedulerClient (that is, to ThreadProxy) makes more sense than plumbing it
directly to Scheduler.

 
  protected:
   virtual ~SchedulerClient() {}