MD Bookmarks: Implement 'Sort by Title' menu button

chrome/test/data/webui/md_bookmarks/reducers_test.js

 // Copyright 2017 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('selection state', function() {
   var state;
   var action;
 
   function select(items, anchor, add) {
     return {
@@ skipping 323 matching lines @@
 
     assertDeepEquals(['2', '4', '3'], state['1'].children);
 
     // Move between different folders.
     action = bookmarks.actions.moveBookmark('4', '5', 0, '1', 1);
     state = bookmarks.NodeState.updateNodes(state, action);
 
     assertDeepEquals(['2', '3'], state['1'].children);
     assertDeepEquals(['4'], state['5'].children);
   });
+
+  test('updates when children of a node are reordered', function() {
+    action = bookmarks.actions.reorderChildren('1', ['4', '2', '3']);
+    state = bookmarks.NodeState.updateNodes(state, action);
+
+    assertDeepEquals(['4', '2', '3'], state['1'].children);
+  });
 });
 
 suite('search state', function() {
   var state;
 
   setup(function() {
     // Search touches a few different things, so we test using the entire state:
     state = bookmarks.util.createEmptyState();
     state.nodes = testTree(createFolder('1', [
       createFolder(
@@ skipping 59 matching lines @@
     state = bookmarks.reduceAction(state, action);
 
     action = bookmarks.actions.removeBookmark('2', '1', 0, state.nodes);
     state = bookmarks.reduceAction(state, action);
 
     // 2 and 3 should be removed, since 2 was deleted and 3 was a descendant of
     // 2.
     assertDeepEquals(['1'], state.search.results);
   });
 });