MD Extensions: Show messages for no extensions, and for no search results

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 174 matching lines @@
       assert(extension_detail_view_tests.TestNames.ClickableElements)).run();
 });
 
 ////////////////////////////////////////////////////////////////////////////////
 // Extension Item List Tests
 
 TEST_F('CrExtensionsBrowserTest', 'ExtensionItemList', function() {
   extension_item_list_tests.registerTests();
   mocha.grep(
       assert(extension_item_list_tests.TestNames.ItemListFiltering)).run();
+  mocha.grep(assert(extension_item_list_tests.TestNames.ItemListNoItemsMsg))
+      .run();
+  mocha
+      .grep(assert(
+          extension_item_list_tests.TestNames.ItemListNoSearchResultsMsg))
+      .run();
 });
 
 ////////////////////////////////////////////////////////////////////////////////
 // Extension Load Error Tests
 
 TEST_F('CrExtensionsBrowserTest', 'ExtensionLoadErrorInteractionTest',
        function() {
   extension_load_error_tests.registerTests();
   mocha.grep(assert(extension_load_error_tests.TestNames.Interaction)).run();
 });
@@ skipping 166 matching lines @@
       assert(extension_navigation_helper_tests.TestNames.Conversions)).run();
 });
 
 TEST_F('CrExtensionsNavigationHelperBrowserTest',
        'ExtensionNavigationHelperPushAndReplaceStateTest', function() {
   extension_navigation_helper_tests.registerTests();
   mocha.grep(
       assert(extension_navigation_helper_tests.TestNames.PushAndReplaceState))
           .run();
 });