Added ability to dynamically toggle frame throttling in the scheduler.

cc/trees/thread_proxy.h

Index: cc/trees/thread_proxy.h
diff --git a/cc/trees/thread_proxy.h b/cc/trees/thread_proxy.h
index 14733f788a71b77fbd401d0014efde433a36832f..80f4e4b03c3e68681cf92a430cf2bc73b148714d 100644
--- a/cc/trees/thread_proxy.h
+++ b/cc/trees/thread_proxy.h
@@ -156,6 +156,7 @@ class CC_EXPORT ThreadProxy : public Proxy,
   void SetOutputSurface(scoped_ptr<OutputSurface>) override;
   void SetLayerTreeHostClientReady() override;
   void SetVisible(bool visible) override;
+  void SetThrottleFrameProduction(bool throttle) override;
   const RendererCapabilities& GetRendererCapabilities() const override;
   void SetNeedsAnimate() override;
   void SetNeedsUpdateLayers() override;
@@ -260,6 +261,7 @@ class CC_EXPORT ThreadProxy : public Proxy,
   void InitializeImplOnImplThread(CompletionEvent* completion);
   void SetLayerTreeHostClientReadyOnImplThread();
   void SetVisibleOnImplThread(CompletionEvent* completion, bool visible);
+  void SetThrottleFrameProductionOnImplThread(bool throttle);
   void HasInitializedOutputSurfaceOnImplThread(
       CompletionEvent* completion,
       bool* has_initialized_output_surface);