Pass Surface ID namespace to renderer compositors.

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 22707f03bb721077c3e1e9261eaefbff4b6743a0..64d97b70fa77bb8fe76806ab687259c54a532a77 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac.mm
@@ -465,6 +465,12 @@ void RenderWidgetHostViewMac::DelegatedFrameHostUpdateVSyncParameters(
   render_widget_host_->UpdateVSyncParameters(timebase, interval);
 }
 
+void RenderWidgetHostViewMac::DelegatedFrameHostUpdateSurfaceIdNamespace(
+    uint32_t surface_id_namespace) {
+  render_widget_host_->Send(new ViewMsg_UpdateSurfaceIdNamespace(
+      render_widget_host_->GetRoutingID(), surface_id_namespace));
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // AcceleratedWidgetMacNSView, public:
 
@@ -1563,6 +1569,10 @@ void RenderWidgetHostViewMac::WheelEventAck(
     [cocoa_view_ processedWheelEvent:event consumed:consumed];
 }
 
+uint32_t RenderWidgetHostViewMac::GetSurfaceIdNamespace() {
+  return delegated_frame_host_->GetSurfaceIdNamespace();
+}
+
 bool RenderWidgetHostViewMac::Send(IPC::Message* message) {
   if (render_widget_host_)
     return render_widget_host_->Send(message);