Dispatch OnLayoutEvent when node gets re-laid out

Reviewed By: ahmedre

Differential Revision: D2768625

fb-gh-sync-id: 4a9862e4c7ada218565fcd87cae25414a0bd5181

ReactAndroid/src/main/java/com/facebook/react/uimanager/OnLayoutEvent.java

@@ -20,7 +20,7 @@ import com.facebook.react.uimanager.events.RCTEventEmitter;
 /**
  * Event used to notify JS component about changes of its position or dimensions
  */
-/* package */ class OnLayoutEvent extends Event<OnLayoutEvent> {
+public class OnLayoutEvent extends Event<OnLayoutEvent> {
 
   private static final Pools.SynchronizedPool<OnLayoutEvent> EVENTS_POOL =
       new Pools.SynchronizedPool<>(20);

ReactAndroid/src/main/java/com/facebook/react/uimanager/ReactShadowNode.java

@@ -264,7 +264,7 @@ public class ReactShadowNode extends CSSNode {
     mShouldNotifyOnLayout = shouldNotifyOnLayout;
   }
 
-  /* package */ boolean shouldNotifyOnLayout() {
+  public boolean shouldNotifyOnLayout() {
     return mShouldNotifyOnLayout;
   }