Teach main thread event queue about closures.

content/renderer/input/input_handler_manager_client.h

Index: content/renderer/input/input_handler_manager_client.h
diff --git a/content/renderer/input/input_handler_manager_client.h b/content/renderer/input/input_handler_manager_client.h
index 7534010473fa6799c940478962acc22e3272f6c0..3087f611400a4a07c3a556af132f04fe485d3075 100644
--- a/content/renderer/input/input_handler_manager_client.h
+++ b/content/renderer/input/input_handler_manager_client.h
@@ -39,6 +39,11 @@ class CONTENT_EXPORT InputHandlerManagerClient {
   // Called from the compositor thread.
   virtual void RegisterRoutingID(int routing_id) = 0;
   virtual void UnregisterRoutingID(int routing_id) = 0;
+  virtual void AssociateRenderFrameRoutingID(int render_frame_routing_id,
+                                             int render_view_routing_id) = 0;
+  virtual void QueueClosureForMainThreadEventQueue(
+      int routing_id,
+      const base::Closure& closure) = 0;
 
   // |HandleInputEvent| will respond to overscroll by calling the passed in
   // callback.