[cc] Add and plumb CFS::DidNotProduceFrame.

cc/output/compositor_frame_sink.h

Index: cc/output/compositor_frame_sink.h
diff --git a/cc/output/compositor_frame_sink.h b/cc/output/compositor_frame_sink.h
index f8b7a47b4e6c97fc06934a4a4062377f270e1e45..f45851180b211da8aa49fa5eee7f798c17ea5d0b 100644
--- a/cc/output/compositor_frame_sink.h
+++ b/cc/output/compositor_frame_sink.h
@@ -25,6 +25,7 @@ class GpuMemoryBufferManager;
 
 namespace cc {
 
+struct BeginFrameAck;
 class CompositorFrame;
 class CompositorFrameSinkClient;
 class LocalSurfaceId;
@@ -121,6 +122,10 @@ class CC_EXPORT CompositorFrameSink {
   // processed in order to unthrottle the next frame.
   virtual void SubmitCompositorFrame(CompositorFrame frame) = 0;
 
+  // Signals that a BeginFrame issued by the BeginFrameSource provided to the
+  // client did not lead to a CompositorFrame submission.
+  virtual void BeginFrameDidNotProduceFrame(const BeginFrameAck& ack) = 0;
+
  protected:
   // Bound to the ContextProvider to hear about when it is lost and inform the
   // |client_|.