MD Bookmarks: Batch updates to the UI when processing deletes and moves

chrome/browser/resources/md_bookmarks/command_manager.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.
 
 /**
  * @fileoverview Element which shows context menus and handles keyboard
  * shortcuts.
  */
 cr.define('bookmarks', function() {
 
@@ skipping 198 matching lines @@
           chrome.bookmarkManagerPrivate.copy(idList, function() {
             bookmarks.ToastManager.getInstance().show(
                 loadTimeData.getString('toastUrlCopied'), false);
           });
           break;
         case Command.DELETE:
           var idList = Array.from(this.minimizeDeletionSet_(itemIds));
           var title = state.nodes[idList[0]].title;
           var labelPromise = cr.sendWithPromise(
               'getPluralString', 'toastItemsDeleted', idList.length);
+          var store = bookmarks.Store.getInstance();
+          store.beginBatchUpdate();
           chrome.bookmarkManagerPrivate.removeTrees(idList, function() {
+            store.endBatchUpdate();
             labelPromise.then(function(label) {
               var pieces = loadTimeData.getSubstitutedStringPieces(label, title)
                                .map(function(p) {
                                  // Make the bookmark name collapsible.
                                  p.collapsible = !!p.arg;
                                  return p;
                                });
               bookmarks.ToastManager.getInstance().showForStringPieces(
                   pieces, true);
             }.bind(this));
@@ skipping 279 matching lines @@
 
   /** @return {!bookmarks.CommandManager} */
   CommandManager.getInstance = function() {
     return assert(CommandManager.instance_);
   };
 
   return {
     CommandManager: CommandManager,
   };
 });