Introduce a file-manager-new-ui flag for the new UI of Files.app.

chrome/browser/resources/file_manager/js/util.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 'use strict';
 
 /**
  * Namespace for utility functions.
  */
 var util = {};
@@ skipping 797 matching lines @@
    */
   v2: function() {
     try {
       return !!(chrome.app && chrome.app.runtime);
     } catch (e) {
       return false;
     }
   },
 
   /**
+   * @return {boolean} True for the new ui.
+   */
+  newUI: function() {
+    if (!util.platform.v2())
+      return false;
+    var manifest = chrome.runtime.getManifest();
+    return manifest.version >= 3.0;
+  },
+
+  /**
    * @param {function(Object)} callback Function accepting a preference map.
    */
   getPreferences: function(callback) {
     try {
       callback(window.localStorage);
     } catch (ignore) {
       chrome.storage.local.get(callback);
     }
   },
 
@@ skipping 490 matching lines @@
  *
  * @param {Document} document Document to be toggled.
  * @param {boolean} enabled True for enabling, false for disabling.
  */
 util.toggleFullScreen = function(document, enabled) {
   if (!enabled)
     document.webkitCancelFullScreen();
   else
     document.body.webkitRequestFullScreen();
 };