Split StateBuilder.ensureBackingViewIsCreated into 2 different methods

Summary:
There are 2 reasons why someone would call StateBuilder.ensureBackingViewIsCreated():
1) to make sure a View is created, because we are going to use it NOW
2) make sure react styles are applied to View, which doesn't really need the View to be created immediately

This diff is splitting the method into 2, without changing behavior. Difference between the methods' signatures is coming from the fact that 1) never takes styles and 2) possibly takes styles.

This is a pure refactoring diff and should have no change in functionality or behavior.

Reviewed By: ahmedre

Differential Revision: D2916697

ReactAndroid/src/main/java/com/facebook/react/flat/StateBuilder.java

@@ -143,6 +143,17 @@ import com.facebook.react.uimanager.events.EventDispatcher;
     node.signalBackingViewIsCreated();
   }
 
+  /* package */ void ensureBackingViewIsCreated(FlatShadowNode node) {
+    if (node.isBackingViewCreated()) {
+      return;
+    }
+
+    int tag = node.getReactTag();
+    mOperationsQueue.enqueueCreateView(node.getThemedContext(), tag, node.getViewClass(), null);
+
+    node.signalBackingViewIsCreated();
+  }
+
   /* package */ void dropView(FlatShadowNode node) {
     mViewsToDrop.add(node);
   }