Pass Surface ID namespace to renderer compositors.

content/browser/compositor/delegated_frame_host.h

Index: content/browser/compositor/delegated_frame_host.h
diff --git a/content/browser/compositor/delegated_frame_host.h b/content/browser/compositor/delegated_frame_host.h
index f208c267e3f2eab3da530a6a29402c33a83a6d03..8b32d3a78aba2b9f1c9537d9ae32c482473bc9db 100644
--- a/content/browser/compositor/delegated_frame_host.h
+++ b/content/browser/compositor/delegated_frame_host.h
@@ -65,6 +65,9 @@ class CONTENT_EXPORT DelegatedFrameHostClient {
   virtual void DelegatedFrameHostUpdateVSyncParameters(
       const base::TimeTicks& timebase,
       const base::TimeDelta& interval) = 0;
+
+  virtual void DelegatedFrameHostUpdateSurfaceIdNamespace(
+      uint32_t surface_id_namespace) = 0;
 };
 
 // The DelegatedFrameHost is used to host all of the RenderWidgetHostView state
@@ -115,6 +118,7 @@ class CONTENT_EXPORT DelegatedFrameHost
       scoped_ptr<RenderWidgetHostViewFrameSubscriber> subscriber);
   void EndFrameSubscription();
   bool HasFrameSubscriber() const { return frame_subscriber_; }
+  uint32_t GetSurfaceIdNamespace();
 
   // Exposed for tests.
   cc::DelegatedFrameProvider* FrameProviderForTesting() const {