[cc] Forward BeginFrameAcks through RWHVChildFrame.

content/browser/frame_host/render_widget_host_view_child_frame.cc

Index: content/browser/frame_host/render_widget_host_view_child_frame.cc
diff --git a/content/browser/frame_host/render_widget_host_view_child_frame.cc b/content/browser/frame_host/render_widget_host_view_child_frame.cc
index 2d155bccc2f19ff27e8b8a5810692dfa392b57e6..1b4f61a7010e598c613a836b8b5fce431c2808ba 100644
--- a/content/browser/frame_host/render_widget_host_view_child_frame.cc
+++ b/content/browser/frame_host/render_widget_host_view_child_frame.cc
@@ -406,6 +406,11 @@ void RenderWidgetHostViewChildFrame::OnSwapCompositorFrame(
                          std::move(frame));
 }
 
+void RenderWidgetHostViewChildFrame::OnBeginFrameDidNotSwap(
+    const cc::BeginFrameAck& ack) {
+  support_->BeginFrameDidNotSwap(ack);
+}
+
 void RenderWidgetHostViewChildFrame::ProcessFrameSwappedCallbacks() {
   // We only use callbacks once, therefore we make a new list for registration
   // before we start, and discard the old list entries when we are done.