[MD settings] side nav routing to page sections

chrome/browser/resources/settings/advanced_page/advanced_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-advanced-page' is the settings page containing the advanced
  * settings.
  *
  * Example:
@@ skipping 13 matching lines @@
     /**
      * Preferences state.
      */
     prefs: {
       type: Object,
       notify: true,
     },
 
     /**
      * The current active route.
+     * @type {SettingsRoute}
      */
     currentRoute: {
       type: Object,
       notify: true,
     },
   },
 
   /**
    * @type {string} Selector to get the sections.
    * TODO(michaelpg): replace duplicate docs with @override once b/24294625
    * is fixed.
    */
   sectionSelector: 'settings-section',
 
   /** @override */
   attached: function() {
     /** @override */
     this.scroller = this.parentElement;
   },
 });