[content] Forward BeginFrameAcks through RWHVMac/BrowserCompositorMac.

content/browser/renderer_host/render_widget_host_view_mac.mm

Index: content/browser/renderer_host/render_widget_host_view_mac.mm
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.mm b/content/browser/renderer_host/render_widget_host_view_mac.mm
index 832a4cb53a3467d55bcc3d5acd791619cf570ee2..d48333d6893c5b4dc31649f89e3c849b58cdb4a2 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac.mm
@@ -1445,6 +1445,11 @@ void RenderWidgetHostViewMac::OnSwapCompositorFrame(
   UpdateDisplayVSyncParameters();
 }
 
+void RenderWidgetHostViewMac::OnBeginFrameDidNotSwap(
+    const cc::BeginFrameAck& ack) {
+  browser_compositor_->OnBeginFrameDidNotSwap(ack);
+}
+
 void RenderWidgetHostViewMac::ClearCompositorFrame() {
   browser_compositor_->GetDelegatedFrameHost()->ClearDelegatedFrame();
 }