[MD Extensions] Implement opening tab-style options pages

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 101 matching lines @@
     setItemAllowedOnAllSites: function(id, enabled) {},
 
     /** @override */
     setItemCollectsErrors: function(id, enabled) {},
 
     /** @override */
     inspectItemView: function(id, view) {},
 
     /** @override */
     repairItem: function(id) {},
+
+    /** @override */
+    showItemOptionsPage: function(id) {},
   };
 
   /**
    * Returns whether or not the element specified is visible.
    * @param {!HTMLElement} parentEl
    * @param {string} selector
    * @param {boolean=} checkLightDom
    * @return {boolean}
    */
   function isVisible(parentEl, selector, checkLightDom) {
@@ skipping 69 matching lines @@
   return {
     ClickMock: ClickMock,
     ListenerMock: ListenerMock,
     MockItemDelegate: MockItemDelegate,
     isVisible: isVisible,
     testVisible: testVisible,
     createExtensionInfo: createExtensionInfo,
     testIronIcons: testIronIcons,
   };
 });