[MD Bookmarks] Implement adding folders and bookmarks from toolbar menu.

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');
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     // 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('adding a folder updates tree with new node', function() {
+    chrome.bookmarks.create = function(info) {};
+
+    // Create a bookmark.
+    var parent = store.idToNodeMap_['8'];
+    var id = '9';
+    store.onBookmarkCreated_(id, createItem(id, {parentId: parent.id}));
+    var lastIndex = parent.children.length - 1;
+    var node = store.idToNodeMap_[id];
+    assertEquals(node, parent.children[lastIndex]);
+    assertEquals(parent.path + '.children.#' + lastIndex, node.path);
+    assertTrue('url' in node);
+
+    // Create a folder.
+    var id = '10';
+    store.onBookmarkCreated_(id, createFolder(id, [], {parentId: parent.id}));
+    lastIndex = parent.children.length - 1;
+    node = store.idToNodeMap_[id];
+    assertEquals(node, parent.children[lastIndex]);
+    assertEquals(parent.path + '.children.#' + lastIndex, node.path);
+    assertFalse('url' in node);
+  });
+
   //////////////////////////////////////////////////////////////////////////////
   // search tests:
 
   test('displayedList updates after searchTerm changes', function() {
     var SEARCH_RESULTS = [
       createItem('1', {title: 'cat'}),
       createItem('2', {title: 'apple'}),
       createItem('3', {title: 'paris'}),
     ];
     overrideBookmarksSearch(SEARCH_RESULTS);
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     store.fire(
         'select-item', {item: store.displayedList[2], add: true, range: false});
     store.fire(
         'select-item', {item: store.displayedList[4], add: true, range: true});
     assertDeepEquals(
         [true, false, true, true, true],
         store.displayedList.map(i => i.isSelectedItem));
     assertEquals(2, store.anchorIndex_);
   });
 });