MD Bookmarks: Add right-click context menu to sidebar folders

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 68 matching lines @@
 
     detached: function() {
       CommandManager.instance_ = null;
       document.removeEventListener('open-item-menu', this.boundOnOpenItemMenu_);
       document.removeEventListener('command-undo', this.boundOnCommandUndo_);
       document.removeEventListener('keydown', this.boundOnKeydown_);
     },
 
     /**
      * Display the command context menu at (|x|, |y|) in window co-ordinates.
-     * Commands will execute on the currently selected items.
+     * Commands will execute on |items| if given, or on the currently selected
+     * items.
      * @param {number} x
      * @param {number} y
+     * @param {Set<string>=} items
      */
-    openCommandMenuAtPosition: function(x, y) {
-      this.menuIds_ = this.getState().selection.items;
+    openCommandMenuAtPosition: function(x, y, items) {
+      this.menuIds_ = items || this.getState().selection.items;
       /** @type {!CrActionMenuElement} */ (this.$.dropdown)
           .showAtPosition({top: y, left: x});
     },
 
     /**
      * Display the command context menu positioned to cover the |target|
      * element. Commands will execute on the currently selected items.
      * @param {!Element} target
      */
     openCommandMenuAtElement: function(target) {
@@ skipping 377 matching lines @@
 
   /** @return {!bookmarks.CommandManager} */
   CommandManager.getInstance = function() {
     return assert(CommandManager.instance_);
   };
 
   return {
     CommandManager: CommandManager,
   };
 });