MD WebUI: Reimplement cr-shared-menu using iron-dropdown.

chrome/test/data/webui/cr_elements/cr_elements_browsertest.js

 // Copyright 2016 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 Tests for shared Polymer elements. */
 
 /** @const {string} Path to source root. */
 var ROOT_PATH = '../../../../../';
 
 // Polymer BrowserTest fixture.
@@ skipping 78 matching lines @@
   /** @override */
   extraLibraries: CrElementsBrowserTest.prototype.extraLibraries.concat([
     'cr_slider_tests.js',
   ]),
 };
 
 TEST_F('CrElementsSliderTest', 'All', function() {
   cr_slider.registerTests();
   mocha.run();
 });
+
+function CrElementsSharedMenuTest() {}
+
+CrElementsSharedMenuTest.prototype = {
+  __proto__: CrElementsBrowserTest.prototype,
+
+  /** @override */
+  browsePreload:
+      'chrome://resources/cr_elements/cr_shared_menu/cr_shared_menu.html',
+
+  /** @override */
+  extraLibraries: CrElementsBrowserTest.prototype.extraLibraries.concat([
+    'cr_shared_menu_tests.js'
+  ]),
+};
+
+TEST_F('CrElementsSharedMenuTest', 'All', function() {
+  mocha.run();
+});