[MD Extensions] Add logic for opening the extension's home page

chrome/test/data/webui/extensions/extension_test_util.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 Common utilities for extension ui tests. */
 cr.define('extension_test_util', function() {
   /**
    * A mock to test that clicking on an element calls a specific method.
    * @constructor
    */
@@ skipping 157 matching lines @@
     var baseUrl = 'chrome-extension://' + id + '/';
     return Object.assign({
       commands: [],
       dependentExtensions: [],
       description: 'This is an extension',
       disableReasons: {
         suspiciousInstall: false,
         corruptInstall: false,
         updateRequired: false,
       },
+      homePage: {specified: false, url: ''},
       iconUrl: 'chrome://extension-icon/' + id + '/24/0',
       id: id,
       incognitoAccess: {isEnabled: true, isActive: false},
       location: 'FROM_STORE',
       manifestErrors: [],
       name: 'Wonderful Extension',
       runtimeErrors: [],
       permissions: [],
       state: 'ENABLED',
       type: 'EXTENSION',
@@ skipping 18 matching lines @@
   return {
     ClickMock: ClickMock,
     ListenerMock: ListenerMock,
     MockItemDelegate: MockItemDelegate,
     isVisible: isVisible,
     testVisible: testVisible,
     createExtensionInfo: createExtensionInfo,
     testIronIcons: testIronIcons,
   };
 });