cc: Introduce BeginFrame sequence numbers and acknowledgements.

content/browser/renderer_host/delegated_frame_host.h

Index: content/browser/renderer_host/delegated_frame_host.h
diff --git a/content/browser/renderer_host/delegated_frame_host.h b/content/browser/renderer_host/delegated_frame_host.h
index a24a821641fdf463c13c8a16074a1fe4a8e61db0..4f5f5a6f5c6622da30b0d224285a45ddce2284fc 100644
--- a/content/browser/renderer_host/delegated_frame_host.h
+++ b/content/browser/renderer_host/delegated_frame_host.h
@@ -168,6 +168,8 @@ class CONTENT_EXPORT DelegatedFrameHost
                                          RenderWidgetHostViewBase* target_view,
                                          gfx::Point* transformed_point);
 
+  bool skipped_frames() const { return skipped_frames_; }
+
   // Exposed for tests.
   cc::SurfaceId SurfaceIdForTesting() const {
     return cc::SurfaceId(frame_sink_id_, local_frame_id_);