[MD settings] adding a test for Appearance settings

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 11 matching lines @@
 
   /** @override */
   browsePreload: 'chrome://md-settings/',
 
   /** @override */
   extraLibraries: PolymerTest.getLibraries(ROOT_PATH),
 
   /** @override */
   runAccessibilityChecks: false,
 
+  /** @override */
+  setUp: function() {
+    suiteSetup(function() {
+      return CrSettingsPrefs.initialized;
+    });
+  },
+
   /**
    * @param {string} type The settings page type, e.g. 'advanced' or 'basic'.
    * @return {Node} The DOM node for the page.
    */
   getPage: function(type) {
     var settings = document.querySelector('cr-settings');
     assertTrue(!!settings);
     var settingsUi = settings.shadowRoot.querySelector('settings-ui');
     assertTrue(!!settingsUi);
     var settingsMain = settingsUi.shadowRoot.querySelector('settings-main');
@@ skipping 18 matching lines @@
     assertGT(len, 0);
     for (var i = 0; i < len; ++i) {
       var s = sections[i];
       if (s.section == section)
         return s;
     }
     assertNotReached('Section not found: ' + section + ' in ' + page);
     return undefined;
   },
 };