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

content/browser/renderer_host/render_widget_host_view_base.h

Index: content/browser/renderer_host/render_widget_host_view_base.h
diff --git a/content/browser/renderer_host/render_widget_host_view_base.h b/content/browser/renderer_host/render_widget_host_view_base.h
index 657ad2027f14a0c5c9deec9f61056a39592cddd5..566b912b7c2e2344c15c5cec8c8ae312e4a324c5 100644
--- a/content/browser/renderer_host/render_widget_host_view_base.h
+++ b/content/browser/renderer_host/render_widget_host_view_base.h
@@ -43,6 +43,10 @@ class SkBitmap;
 
 struct ViewHostMsg_SelectionBounds_Params;
 
+namespace cc {
+struct BeginFrameAck;
+}  // namespace cc
+
 namespace media {
 class VideoFrame;
 }
@@ -218,6 +222,8 @@ class CONTENT_EXPORT RenderWidgetHostViewBase : public RenderWidgetHostView,
   virtual void OnSwapCompositorFrame(uint32_t compositor_frame_sink_id,
                                      cc::CompositorFrame frame) {}
 
+  virtual void OnBeginFrameDidNotSwap(const cc::BeginFrameAck& ack) {}
+
   // This method exists to allow removing of displayed graphics, after a new
   // page has been loaded, to prevent the displayed URL from being out of sync
   // with what is visible on screen.