[MD settings] advanced toggle; add scrollWhenReady

chrome/test/data/webui/settings/settings_page_browsertest.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 Prototype for Settings page tests. */
 
 /** @const {string} Path to root from chrome/test/data/webui/settings/. */
 var ROOT_PATH = '../../../../../';
 
 // Polymer BrowserTest fixture.
@@ skipping 33 matching lines @@
    * @param {string} type The settings page type, e.g. 'advanced' or 'basic'.
    * @return {!PolymerElement} The PolymerElement for the page.
    */
   getPage: function(type) {
     var settings = document.querySelector('cr-settings');
     assertTrue(!!settings);
     var settingsUi = settings.$$('settings-ui');
     assertTrue(!!settingsUi);
     var settingsMain = settingsUi.$$('settings-main');
     assertTrue(!!settingsMain);
-    var pages = settingsMain.$.pageContainer;
-    assertTrue(!!pages);
     var pageType = 'settings-' + type + '-page';
-    var page = pages.querySelector(pageType);
+    var page = settingsMain.$$(pageType);
     assertTrue(!!page);
     return page;
   },
 
   /**
    * @param {!PolymerElement} page The PolymerElement for the page containing
    *     |section|.
    * @param {string} section The settings page section, e.g. 'appearance'.
    * @return {Node|undefined} The DOM node for the section.
    */
@@ skipping 62 matching lines @@
     // Any other stamped subpages should not be visible.
     var subpages = stampedChildren.filter(function(element) {
       return element.id != 'main';
     });
     for (var subpage of subpages) {
       assertEquals(subpage.offsetHeight, 0, 'Expected subpage #' + subpage.id +
           ' in ' + section.section + ' not to be visible.');
     }
   },
 };