add node measure event and passing the callback to java layer

Summary: Adds measure event and its listener initial code structure

Reviewed By: davidaurelio

Differential Revision: D15600738

fbshipit-source-id: d15764e0b64edb170fcb15e0912ecce5f7e53595

yoga/event/event.h

@@ -21,7 +21,8 @@ struct Event {
     NodeDeallocation,
     NodeLayout,
     LayoutPassStart,
-    LayoutPassEnd
+    LayoutPassEnd,
+    NodeMeasure,
   };
   class Data;
   using Subscriber = void(const YGNode&, Type, Data);
@@ -76,5 +77,10 @@ struct Event::TypedData<Event::LayoutPassEnd> {
   void* layoutContext;
 };
 
+template <>
+struct Event::TypedData<Event::NodeMeasure> {
+  void* layoutContext;
+};
+
 } // namespace yoga
 } // namespace facebook