Hook up DidReceiveInputEvent to the blink scheduler

content/renderer/scheduler/renderer_scheduler.h

Index: content/renderer/scheduler/renderer_scheduler.h
diff --git a/content/renderer/scheduler/renderer_scheduler.h b/content/renderer/scheduler/renderer_scheduler.h
index 193200919c5ad8c53799a62ce08e2a103ac79545..f10dc2616d3aac8f3370b1516443d55601744fcf 100644
--- a/content/renderer/scheduler/renderer_scheduler.h
+++ b/content/renderer/scheduler/renderer_scheduler.h
@@ -46,6 +46,10 @@ class CONTENT_EXPORT RendererScheduler {
   // on any thread.
   virtual void DidReceiveInputEvent() = 0;
 
+  // Tells the scheduler that the system is displaying an animation. E.g. a
+  // fling.
+  virtual void DidAnimate() = 0;

[rmcilroy, 2014/11/06 00:53:16]

Is this called for all animations, or only input related animations (e.g.,
fling).  If the latter, how about DidAnimateForInput() ?  Also is this called by
the compositor thread?  If so suffix with "OnCompositorThread" to match
DidReceiveInputEventOnCompositorThread().  Mention which thread it can be called
on in the comment.

[alex clarke (OOO till 29th), 2014/11/06 19:21:45]

Done.

+
   // Returns true if there is high priority work pending on the main thread
   // and the caller should yield to let the scheduler service that work.
   // Must be called from the main thread.