MD Settings: Lazy load the contents of the "advanced" settings.

chrome/test/data/webui/settings/languages_page_browsertest.js

 // Copyright 2016 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 Suite of tests for settings-languages-page. */
 
 /** @const {string} Path to root from chrome/test/data/webui/settings/. */
 var ROOT_PATH = '../../../../../';
 
 // Polymer BrowserTest fixture.
@@ skipping 25 matching lines @@
 // the Settings page can take several seconds to load in a Release build
 // and several times that in a Debug build. See https://crbug.com/558434.
 GEN('#if defined(OS_WINDOWS) || defined(MEMORY_SANITIZER) || !defined(NDEBUG)');
 GEN('#define MAYBE_LanguagesPage DISABLED_LanguagesPage');
 GEN('#else');
 GEN('#define MAYBE_LanguagesPage LanguagesPage');
 GEN('#endif');
 
 // Runs languages page tests.
 TEST_F('SettingsLanguagesPageBrowserTest', 'MAYBE_LanguagesPage', function() {
+  var self = this;
+
+  suiteSetup(function() {
+    self.toggleAdvanced();
+  });
+
   suite('languages page', function() {
     testing.Test.disableAnimationsAndTransitions();
 
-    this.toggleAdvanced();
-    var page = this.getPage('basic');
-
     var languagesSection;
     var languagesPage;
     var languagesCollapse;
     var languageHelper;
     var actionMenu;
 
     /**
      * @param {numExpected} Expected number of languages to eventually be
      *     enabled.
      * @return {!Promise} Resolved when the number of enabled languages changes
@@ skipping 12 matching lines @@
     }
 
     // Returns supported languages that are not enabled.
     function getAvailableLanguages() {
       return languagesPage.languages.supported.filter(function(language) {
         return !languageHelper.isLanguageEnabled(language.code);
       });
     }
 
     suiteSetup(function() {
+      var page = self.basicPage;
       page.set('pageVisibility.languages', true);
       Polymer.dom.flush();
 
       languagesSection = assert(this.getSection(page, 'languages'));
       languagesPage = assert(
           languagesSection.querySelector('settings-languages-page'));
       languagesCollapse = languagesPage.$.languagesCollapse;
       languagesCollapse.opened = true;
       actionMenu = languagesPage.$.menu.get();
 
@@ skipping 355 matching lines @@
             0, triggerRow.querySelector('.secondary').textContent.length);
       }
     });
   }.bind(this));
 
   // TODO(michaelpg): Test more aspects of the languages UI.
 
   // Run all registered tests.
   mocha.run();
 });