Pass Surface ID namespace to renderer compositors.

content/browser/renderer_host/render_widget_host_view_mac.h

Index: content/browser/renderer_host/render_widget_host_view_mac.h
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.h b/content/browser/renderer_host/render_widget_host_view_mac.h
index 499026922fd9ddae695df9f03cab815bf508fba2..1068f85a4c58944f2c2b9c8b85815cc72e870f1e 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.h
+++ b/content/browser/renderer_host/render_widget_host_view_mac.h
@@ -345,6 +345,8 @@ class CONTENT_EXPORT RenderWidgetHostViewMac
   void WheelEventAck(const blink::WebMouseWheelEvent& event,
                      InputEventAckState ack_result) override;
 
+  uint32_t GetSurfaceIdNamespace() override;
+
   // IPC::Sender implementation.
   bool Send(IPC::Message* message) override;
 
@@ -440,7 +442,7 @@ class CONTENT_EXPORT RenderWidgetHostViewMac
   };
   BrowserCompositorViewState browser_compositor_state_;
 
-  // Delegated frame management and compositior.
+  // Delegated frame management and compositor.
   scoped_ptr<DelegatedFrameHost> delegated_frame_host_;
   scoped_ptr<ui::Layer> root_layer_;