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

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index 732394d07ba0b1771d60a1c392333d15f63d27a2..3701b69d3cc69107e65f391294df914fd240b17d 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -937,12 +937,23 @@ void RenderWidgetHostViewAura::OnSwapCompositorFrame(
     selection.end.SetEdge(end_edge_top, end_edge_bottom);
   }
 
+  cc::BeginFrameAck ack(frame.metadata.begin_frame_ack);
+
   if (delegated_frame_host_) {
     delegated_frame_host_->SwapDelegatedFrame(compositor_frame_sink_id,
                                               std::move(frame));
   }
   selection_controller_->OnSelectionBoundsChanged(selection.start,
                                                   selection.end);
+
+  if (begin_frame_source_)
+    begin_frame_source_->DidFinishFrame(this, ack);
+}
+
+void RenderWidgetHostViewAura::OnBeginFrameDidNotSwap(
+    const cc::BeginFrameAck& ack) {
+  if (begin_frame_source_)
+    begin_frame_source_->DidFinishFrame(this, ack);
 }
 
 void RenderWidgetHostViewAura::ClearCompositorFrame() {