Add shim files for RN in npm package

(cherry picked from commit c29642d6ed)

packages/react/lib/React.native.js

@@ -0,0 +1,5 @@
+'use strict';
+
+// TODO: Once we remove the DOM bits from React, this shim can go away.
+
+module.exports = require('./ReactIsomorphic');

packages/react/lib/ReactDOM.native.js

@@ -0,0 +1,12 @@
+'use strict';
+
+var ReactUpdates = require('./ReactUpdates');
+
+// TODO: In React Native, ReactTestUtils depends on ./ReactDOM (for
+// renderIntoDocument, which should never be called) and Relay depends on
+// react-dom (for batching). Once those are fixed, nothing in RN should import
+// this module and this file can go away.
+
+module.exports = {
+  unstable_batchedUpdates: ReactUpdates.batchedUpdates,
+};