MD Settings: Fix scrolling bugs and hacks caused by undefined load behavior

chrome/test/data/webui/settings/about_page_tests.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.
 
 cr.define('settings_about_page', function() {
   /**
    * @constructor
    * @implements {settings.AboutPageBrowserProxy}
    * @extends {settings.TestBrowserProxy}
    */
@@ skipping 163 matching lines @@
           aboutObsoleteEndOfTheLine: false,
         });
       });
 
       /** @return {!Promise} */
       function initNewPage() {
         aboutBrowserProxy.reset();
         lifetimeBrowserProxy.reset();
         PolymerTest.clearBody();
         page = document.createElement('settings-about-page');
+        settings.navigateTo(settings.Route.ABOUT);
         document.body.appendChild(page);
         return aboutBrowserProxy.whenCalled('refreshUpdateStatus');
       }
 
       /**
        * Test that the status icon and status message update according to
        * incoming 'update-status-changed' events.
        */
       test('IconAndMessageUpdates', function() {
         var icon = page.$$('iron-icon');
@@ skipping 508 matching lines @@
     registerTests: function() {
       if (cr.isChromeOS) {
         registerDetailedBuildInfoTests();
         registerChannelSwitcherDialogTests();
       }
       registerAboutPageTests();
     },
     registerOfficialBuildTests: registerOfficialBuildTests,
   };
 });