[cc] Pass on BeginFrameAcks from CompositorEBFS through RWHVAura, DFH.

content/browser/renderer_host/render_widget_host_impl.h

Index: content/browser/renderer_host/render_widget_host_impl.h
diff --git a/content/browser/renderer_host/render_widget_host_impl.h b/content/browser/renderer_host/render_widget_host_impl.h
index 3ea9441944892a35986e8fded6575d75d4d05068..3df73533ebac7e9ad876344efaaf7d0246b4a917 100644
--- a/content/browser/renderer_host/render_widget_host_impl.h
+++ b/content/browser/renderer_host/render_widget_host_impl.h
@@ -60,6 +60,10 @@ class WebMouseEvent;
 struct WebCompositionUnderline;
 }
 
+namespace cc {
+struct BeginFrameAck;
+}  // namespace cc
+
 #if defined(OS_MACOSX)
 namespace device {
 class PowerSaveBlocker;
@@ -625,6 +629,7 @@ class CONTENT_EXPORT RenderWidgetHostImpl : public RenderWidgetHost,
   void OnSetTooltipText(const base::string16& tooltip_text,
                         blink::WebTextDirection text_direction_hint);
   bool OnSwapCompositorFrame(const IPC::Message& message);
+  void OnBeginFrameDidNotSwap(const cc::BeginFrameAck& ack);
   void OnUpdateRect(const ViewHostMsg_UpdateRect_Params& params);
   void OnQueueSyntheticGesture(const SyntheticGesturePacket& gesture_packet);
   void OnSetCursor(const WebCursor& cursor);