CrOS Settings: Add skeleton page for multidevice section.

chrome/browser/resources/settings/basic_page/basic_page.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
  * 'settings-basic-page' is the settings page containing the actual settings.
  */
 Polymer({
   is: 'settings-basic-page',
 
   behaviors: [MainPageBehavior, WebUIListenerBehavior],
 
   properties: {
     /** Preferences state. */
     prefs: {
       type: Object,
       notify: true,
     },
 
+    // <if expr="chromeos">
     showAndroidApps: Boolean,
 
+    showMultidevice: Boolean,
+
     havePlayStoreApp: Boolean,
+    // </if>
 
     /** @type {!AndroidAppsInfo|undefined} */
     androidAppsInfo: Object,
 
     showChromeCleanup: {
       type: Boolean,
       value: function() {
         return loadTimeData.valueExists('chromeCleanupEnabled') &&
             loadTimeData.getBoolean('chromeCleanupEnabled');
       },
@@ skipping 179 matching lines @@
     // settings app is not yet available.
     if (!this.havePlayStoreApp &&
         (!this.androidAppsInfo || !this.androidAppsInfo.settingsAppAvailable)) {
       return false;
     }
 
     return true;
   },
 
   /**
+   * @return {boolean} Whether to show the multidevice settings page.
+   * @private
+   */
+  shouldShowMultidevice_: function() {
+    var visibility = /** @type {boolean|undefined} */ (
+        this.get('pageVisibility.multidevice'));
+    return this.showMultidevice && this.showPage_(visibility);
+  },
+
+  /**
    * Hides everything but the newly expanded subpage.
    * @private
    */
   onSubpageExpanded_: function() {
     this.hasExpandedSection_ = true;
   },
 
   /**
    * Render the advanced page now (don't wait for idle).
    * @private
@@ skipping 56 matching lines @@
 
   /**
    * @param {boolean} opened Whether the menu is expanded.
    * @return {string} Icon name.
    * @private
    */
   getArrowIcon_: function(opened) {
     return opened ? 'cr:arrow-drop-up' : 'cr:arrow-drop-down';
   },
 });