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

chrome/test/data/webui/settings/settings_passwords_section_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 Runs the Polymer Password Settings tests. */
 
 /** @const {string} Path to root from chrome/test/data/webui/settings/. */
 var ROOT_PATH = '../../../../../';
 
 // Polymer BrowserTest fixture.
@@ skipping 11 matching lines @@
 function SettingsPasswordSectionBrowserTest() {}
 
 SettingsPasswordSectionBrowserTest.prototype = {
   __proto__: PolymerTest.prototype,
 
   /** @override */
   browsePreload:
       'chrome://md-settings/passwords_and_forms_page/passwords_section.html',
 
   /** @override */
-  extraLibraries: PolymerTest.getLibraries(ROOT_PATH),
+  extraLibraries: PolymerTest.getLibraries(ROOT_PATH).concat([
+    'ensure_lazy_loaded.js',
+  ]),
 
   /** @override */
   setUp: function() {
     PolymerTest.prototype.setUp.call(this);
     // Test is run on an individual element that won't have a page language.
     this.accessibilityAuditConfig.auditRulesToIgnore.push('humanLangMissing');
+
+    settings.ensureLazyLoaded();
   },
-
 };
 
 /** This test will validate that the section is loaded with data. */
 TEST_F('SettingsPasswordSectionBrowserTest', 'uiTests', function() {
   /**
    * Helper method that validates a that elements in the password list match
    * the expected data.
    * @param {!Element} listElement The iron-list element that will be checked.
    * @param {!Array<!chrome.passwordsPrivate.PasswordUiEntry>} passwordList The
    *     expected data.
@@ skipping 405 matching lines @@
         assertEquals(item.loginPair.username, event.detail.username);
         done();
       });
 
       MockInteractions.tap(passwordDialog.$.showPasswordButton);
     });
   });
 
   mocha.run();
 });