WebUI: Close cr-action-menu on popstate event.

chrome/test/data/webui/cr_elements/cr_action_menu_test.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 cr-action-menu element. Runs as an interactive UI
  * test, since many of these tests check focus behavior.
  */
 suite('CrActionMenu', function() {
   /** @type {?CrActionMenuElement} */
@@ skipping 78 matching lines @@
   });
 
   test('close on resize', function() {
     menu.showAt(document.querySelector('#dots'));
     assertTrue(menu.open);
 
     window.dispatchEvent(new CustomEvent('resize'));
     assertFalse(menu.open);
   });
 
+  test('close on popstate', function() {
+    menu.showAt(document.querySelector('#dots'));
+    assertTrue(menu.open);
+
+    window.dispatchEvent(new CustomEvent('popstate'));
+    assertFalse(menu.open);
+  });
+
   /** @param {string} key The key to use for closing. */
   function testFocusAfterClosing(key) {
     return new Promise(function(resolve) {
       var dots = document.querySelector('#dots');
       menu.showAt(dots);
       assertTrue(menu.open);
 
       // Check that focus returns to the anchor element.
       dots.addEventListener('focus', resolve);
       MockInteractions.keyDownOn(menu, key, [], key);
       assertFalse(menu.open);
     });
   }
 
   test('close on Tab', function() { return testFocusAfterClosing('Tab'); });
   test('close on Escape', function() {
     return testFocusAfterClosing('Escape');
   });
 });