cc: Register namespace hierarchy after ui::Compositor's SurfaceFactory available

cc/trees/layer_tree_host.h

Index: cc/trees/layer_tree_host.h
diff --git a/cc/trees/layer_tree_host.h b/cc/trees/layer_tree_host.h
index febf9a20bb0c0133aad9be7143215cbd9c69a0d6..9cdc06c38420612cfa00e6914e950e0e73d836f5 100644
--- a/cc/trees/layer_tree_host.h
+++ b/cc/trees/layer_tree_host.h
@@ -299,6 +299,8 @@ class CC_EXPORT LayerTreeHost : public MutatorHostClient {
 
   bool in_paint_layer_contents() const { return in_paint_layer_contents_; }
 
+  bool has_output_surface() const { return !!current_output_surface_; }
+
   // CreateUIResource creates a resource given a bitmap.  The bitmap is
   // generated via an interface function, which is called when initializing the
   // resource and when the resource has been lost (due to lost context).  The