MD Settings: Add Google Play Store (Arc++) section

chrome/browser/resources/settings/settings_page/settings_page_visibility.js

 // Copyright 2015 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.
 
 /**
  * @fileoverview
  * Behavior controlling the visibility of Settings pages.
  *
  * Example:
  *   behaviors: [SettingsPageVisibility],
@@ skipping 18 matching lines @@
      * in which case visibility defaults to false.
      * @type {Object<boolean>}
      */
     pageVisibility: {
       type: Object,
       value: function() { return {}; },
     },
   },
 
   /**
-   * @param {boolean} visibility
+   * @param {boolean|undefined} visibility
    * @return {boolean}
    */
   showPage: function(visibility) {
     if (settingsHidePagesByDefaultForTest)
       return visibility === true;
     return visibility !== false;
   },
 };