Pass Surface ID namespace to renderer compositors.

content/renderer/render_widget.h

Index: content/renderer/render_widget.h
diff --git a/content/renderer/render_widget.h b/content/renderer/render_widget.h
index df4f62f0e485c3fbaa88c2e471add10b87326e99..36af859f473e5be4a1ca15ef3b3b4e89494de5f1 100644
--- a/content/renderer/render_widget.h
+++ b/content/renderer/render_widget.h
@@ -368,7 +368,7 @@ class CONTENT_EXPORT RenderWidget
               IPC::SyncMessage* create_widget_message);
 
   // Finishes creation of a pending view started with Init.
-  void CompleteInit();
+  void CompleteInit(uint32_t surface_id_namespace);
 
   // Sets whether this RenderWidget has been swapped out to be displayed by
   // a RenderWidget in a different process.  If so, no new IPC messages will be
@@ -413,7 +413,7 @@ class CONTENT_EXPORT RenderWidget
   void OnMouseCaptureLost();
   virtual void OnSetFocus(bool enable);
   void OnClose();
-  void OnCreatingNewAck();
+  void OnCreatingNewAck(uint32_t surface_id_namespace);
   virtual void OnResize(const ViewMsg_Resize_Params& params);
   void OnEnableDeviceEmulation(const blink::WebDeviceEmulationParams& params);
   void OnDisableDeviceEmulation();
@@ -444,6 +444,7 @@ class CONTENT_EXPORT RenderWidget
   void OnUpdateScreenRects(const gfx::Rect& view_screen_rect,
                            const gfx::Rect& window_screen_rect);
   void OnShowImeIfNeeded();
+  void OnUpdateSurfaceIdNamespace(uint32 surface_id_namespace);
 
 #if defined(OS_ANDROID)
   // Whenever an IME event that needs an acknowledgement is sent to the browser,