Pass Surface ID namespace to renderer compositors.

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index 0923657632c9eabcf91d2ec323cdbfeb7373cac5..e1d3199d9745259373ba3ae2c2691062357dd316 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -412,8 +412,12 @@ void RenderWidgetHostImpl::Init() {
   GpuSurfaceTracker::Get()->SetSurfaceHandle(
       surface_id_, GetCompositingSurface());
 
+  uint32_t surface_id_namespace = 0;
+  if (view_)
+    surface_id_namespace = view_->GetSurfaceIdNamespace();
+
   // Send the ack along with the information on placement.
-  Send(new ViewMsg_CreatingNew_ACK(routing_id_));
+  Send(new ViewMsg_CreatingNew_ACK(routing_id_, surface_id_namespace));
   GetProcess()->ResumeRequestsForView(routing_id_);
 
   WasResized();