Add Settings bluetooth page test

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 18 matching lines @@
   /** @override */
   runAccessibilityChecks: false,
 
   /**
    * @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');
+    var settingsUi = settings.$$('settings-ui');
     assertTrue(!!settingsUi);
-    var settingsMain = settingsUi.shadowRoot.querySelector('settings-main');
+    var settingsMain = settingsUi.$$('settings-main');
     assertTrue(!!settingsMain);
     var pages = settingsMain.$.pageContainer;
     assertTrue(!!pages);
     var pageType = 'settings-' + type + '-page';
     var page = pages.querySelector(pageType);
     assertTrue(!!page);
     return page;
   },
 
   /**
    * @param {Node} page The DOM node for the settings page containing |section|.
    * @param {string} section The settings page section, e.g. 'appearance'.
    * @return {Node} The DOM node for the section.
    */
   getSection: function(page, section) {
     var sections = page.shadowRoot.querySelectorAll('settings-section');

[michaelpg, 2015/11/20 15:08:18]

$$

[stevenjb, 2015/11/20 17:47:41]

"Convenience method to run querySelector on this local DOM scope" (i.e. not
querySelectorAll).

[michaelpg, 2015/11/24 15:55:49]

Sorry, got a bit overzealous in reducing wordiness!

     assertTrue(!!sections);
     var len = sections.length;
     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;
   },
 };