[MD Extensions] Update subpages when the backing extension data changes

chrome/test/data/webui/extensions/cr_extensions_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 Runs the Polymer Settings tests. */
 
 /** @const {string} Path to source root. */
 var ROOT_PATH = '../../../../../';
 
 // Polymer BrowserTest fixture.
@@ skipping 221 matching lines @@
   mocha.grep(assert(extension_manager_tests.TestNames.ChangePages)).run();
 });
 
 TEST_F('CrExtensionsBrowserTestWithIdQueryParam',
        'ExtensionManagerNavigationToDetailsTest', function() {
   extension_manager_tests.registerTests();
   mocha.grep(
       assert(extension_manager_tests.TestNames.UrlNavigationToDetails)).run();
 });
 
+TEST_F('CrExtensionsBrowserTest', 'ExtensionManagerUpdateItemDataTest',
+       function() {
+  extension_manager_tests.registerTests();
+  mocha.grep(assert(extension_manager_tests.TestNames.UpdateItemData)).run();
+});
+
 ////////////////////////////////////////////////////////////////////////////////
 // Extension Keyboard Shortcuts Tests
 
 TEST_F('CrExtensionsBrowserTest', 'ExtensionKeyboardShortcutsLayoutTest',
        function() {
   extension_keyboard_shortcut_tests.registerTests();
   mocha.grep(assert(extension_keyboard_shortcut_tests.TestNames.Layout)).run();
 });
 
 TEST_F('CrExtensionsBrowserTest', 'ExtensionShortcutUtilTest', function() {
@@ skipping 48 matching lines @@
 });
 
 ////////////////////////////////////////////////////////////////////////////////
 // Extension Code Section Tests
 
 TEST_F('CrExtensionsBrowserTest', 'ExtensionCodeSectionLayoutTest',
        function() {
   extension_code_section_tests.registerTests();
   mocha.grep(assert(extension_code_section_tests.TestNames.Layout)).run();
 });