[MD Bookmarks] Add edit folder.

chrome/test/data/webui/md_bookmarks/store_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.
 
 suite('<bookmarks-store>', function() {
   var store;
   var TEST_TREE;
 
   function replaceStore() {
     store = document.createElement('bookmarks-store');
@@ skipping 205 matching lines @@
 
     // Edit url and title updates idToNodeMap_ properly.
     store.onBookmarkChanged_('2', {
       'title': 'test',
       'url': 'http://www.google.com',
     });
     assertEquals('test', store.idToNodeMap_['2'].title);
     assertEquals('http://www.google.com', store.idToNodeMap_['2'].url);
   });
 
+  test('folder gets updated after renaming', function() {
+    store.onBookmarkChanged_('3', {'title': 'Main Folder'});
+    assertEquals('Main Folder', store.idToNodeMap_['3'].title);
+    assertEquals(undefined, store.idToNodeMap_['3'].url);
+  });
+
   //////////////////////////////////////////////////////////////////////////////
   // search tests:
 
   test('displayedList updates after searchTerm changes', function() {
     var SEARCH_RESULTS = [
       'cat',
       'apple',
       'Paris',
     ];
     overrideBookmarksSearch(SEARCH_RESULTS);
@@ skipping 66 matching lines @@
     replaceStore();
     assertEquals(selectedId, store.selectedId);
   });
 
   test('route updates from selectedId', function() {
     var selectedId = '2';
     store.selectedId = selectedId;
     assertEquals('chrome://bookmarks/?id=' + selectedId, window.location.href);
   });
 });