MD Bookmarks: Initial screenreader accessibility improvements

chrome/browser/resources/md_bookmarks/item.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.
 
 Polymer({
   is: 'bookmarks-item',
 
   behaviors: [
     bookmarks.MouseFocusBehavior,
     bookmarks.StoreClient,
@@ skipping 16 matching lines @@
     /** @private */
     isSelectedItem_: {
       type: Boolean,
       reflectToAttribute: true,
     },
 
     /** @private */
     isFolder_: Boolean,
   },
 
+  hostAttributes: {
+    'role': 'listitem',
+  },
+
   observers: [
     'updateFavicon_(item_.url)',
   ],
 
   listeners: {
     'click': 'onClick_',
     'dblclick': 'onDblClick_',
     'contextmenu': 'onContextMenu_',
   },
 
@@ skipping 64 matching lines @@
   onItemIdChanged_: function() {
     // TODO(tsergeant): Add a histogram to measure whether this assertion fails
     // for real users.
     assert(this.getState().nodes[this.itemId]);
     this.updateFromStore();
   },
 
   /** @private */
   onItemChanged_: function() {
     this.isFolder_ = !this.item_.url;
+    this.setAttribute('aria-label', this.item_.title);
   },
 
   /**
    * @param {MouseEvent} e
    * @private
    */
   onClick_: function(e) {
     // Ignore double clicks so that Ctrl double-clicking an item won't deselect
     // the item before opening.
     if (e.detail != 2) {
@@ skipping 19 matching lines @@
   },
 
   /**
    * @param {string} url
    * @private
    */
   updateFavicon_: function(url) {
     this.$.icon.style.backgroundImage = cr.icon.getFavicon(url);
   },
 });