added migrations for instant delivery

node_modules/react/lib/ViewportMetrics.js

@@ -0,0 +1,27 @@
+/**
+ * Copyright 2013-2015, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @providesModule ViewportMetrics
+ */
+
+'use strict';
+
+var ViewportMetrics = {
+
+  currentScrollLeft: 0,
+
+  currentScrollTop: 0,
+
+  refreshScrollValues: function(scrollPosition) {
+    ViewportMetrics.currentScrollLeft = scrollPosition.x;
+    ViewportMetrics.currentScrollTop = scrollPosition.y;
+  }
+
+};
+
+module.exports = ViewportMetrics;