cc: Introduce BeginFrame sequence numbers and acknowledgements.

content/browser/frame_host/render_widget_host_view_guest.cc

Index: content/browser/frame_host/render_widget_host_view_guest.cc
diff --git a/content/browser/frame_host/render_widget_host_view_guest.cc b/content/browser/frame_host/render_widget_host_view_guest.cc
index b14a741cd2243b1cdd955777019c5b69c83d04f8..0f9eca7a9af0564a52accdee9af468f76d17c2df 100644
--- a/content/browser/frame_host/render_widget_host_view_guest.cc
+++ b/content/browser/frame_host/render_widget_host_view_guest.cc
@@ -312,6 +312,10 @@ void RenderWidgetHostViewGuest::OnSwapCompositorFrame(
     allocated_new_local_frame_id = true;
   }
 
+  uint64_t begin_frame_source_id = frame.metadata.begin_frame_source_id;
+  uint64_t begin_frame_number = frame.metadata.begin_frame_number;
+  uint64_t latest_confirmed_frame = frame.metadata.latest_confirmed_frame;
+
   cc::SurfaceFactory::DrawCallback ack_callback = base::Bind(
       &RenderWidgetHostViewChildFrame::SurfaceDrawn,
       RenderWidgetHostViewChildFrame::AsWeakPtr(), compositor_frame_sink_id);
@@ -345,6 +349,9 @@ void RenderWidgetHostViewGuest::OnSwapCompositorFrame(
   // no longer need.
   if (!guest_ || !guest_->attached())
     ClearCompositorSurfaceIfNecessary();
+
+  DidSwapFrame(begin_frame_source_id, begin_frame_number,
+               latest_confirmed_frame);
 }
 
 bool RenderWidgetHostViewGuest::OnMessageReceived(const IPC::Message& msg) {