Profile Avatar Selector: Allow arrow keys to be used for moving between avatars.

chrome/test/data/webui/settings/people_page_manage_profile_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.
 
 cr.define('settings_people_page_manage_profile', function() {
   /**
    * @constructor
    * @implements {settings.ManageProfileBrowserProxy}
    * @extends {settings.TestBrowserProxy}
    */
@@ skipping 35 matching lines @@
         document.body.appendChild(manageProfile);
       });
 
       teardown(function() { manageProfile.remove(); });
 
       // Tests that the manage profile subpage
       //  - gets and receives all the available icons
       //  - has the correct icon selected
       //  - can select a new icon
       test('ManageProfileChangeIcon', function() {
-        var selector = manageProfile.$.selector.$.selector;
+        var selector = manageProfile.$.selector.$['avatar-grid'];
         assertTrue(!!selector);
 
         return browserProxy.whenCalled('getAvailableIcons').then(function() {
           Polymer.dom.flush();
 
           assertEquals('fake-icon-1.png', manageProfile.profileIconUrl);
           assertEquals(2, selector.items.length);
           assertTrue(selector.items[0].classList.contains('iron-selected'));
           assertFalse(selector.items[1].classList.contains('iron-selected'));
 
           MockInteractions.tap(selector.items[1]);
           return browserProxy.whenCalled('setProfileIconAndName').then(
               function(args) {
                 assertEquals('fake-icon-2.png', args[0]);
                 assertEquals('Initial Fake Name', args[1]);
               });
         });
       });
 
       // Tests profile icon updates pushed from the browser.
       test('ManageProfileIconUpdated', function() {
-        var selector = manageProfile.$.selector.$.selector;
+        var selector = manageProfile.$.selector.$['avatar-grid'];
         assertTrue(!!selector);
 
         return browserProxy.whenCalled('getAvailableIcons').then(function() {
           manageProfile.profileIconUrl = 'fake-icon-2.png';
 
           Polymer.dom.flush();
 
           assertEquals('fake-icon-2.png', manageProfile.profileIconUrl);
           assertEquals(2, selector.items.length);
           assertFalse(selector.items[0].classList.contains('iron-selected'));
@@ skipping 32 matching lines @@
       });
     });
   }
 
   return {
     registerTests: function() {
       registerManageProfileTests();
     },
   };
 });