add node layout event and pass it java layer

Summary: Listen to NodeLayout event and passes this event callback to java layer along with the information whether layout or measure was done in this pass

Reviewed By: davidaurelio

Differential Revision: D15696021

fbshipit-source-id: 8c5ca69330a9baca26b77052d4965cc67fe97c75

yoga/event/event.h

@@ -82,5 +82,11 @@ struct Event::TypedData<Event::NodeMeasure> {
   void* layoutContext;
 };
 
+template <>
+struct Event::TypedData<Event::NodeLayout> {
+  bool performLayout;
+  void* layoutContext;
+};
+
 } // namespace yoga
 } // namespace facebook