Add user customizable launch type for apps.

chrome/browser/resources/shared/js/cr/ui/menu_item.js

 // Copyright (c) 2010 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.
 
 cr.define('cr.ui', function() {
   const Command = cr.ui.Command;
 
   /**
    * Creates a new menu item element.
    * @param {Object=} opt_propertyBag Optional properties.
@@ skipping 34 matching lines @@
      */
     command_: null,
     get command() {
       return this.command_;
     },
     set command(command) {
       if (this.command_) {
         this.command_.removeEventListener('labelChange', this);
         this.command_.removeEventListener('disabledChange', this);
         this.command_.removeEventListener('hiddenChange', this);
+        this.command_.removeEventListener('checkedChange', this);
       }
 
       if (typeof command == 'string' && command[0] == '#') {
         command = this.ownerDocument.getElementById(command.slice(1));
         cr.ui.decorate(command, Command);
       }
 
       this.command_ = command;
       if (command) {
         if (command.id)
           this.setAttribute('command', '#' + command.id);
 
         this.label = command.label;
         this.disabled = command.disabled;
         this.hidden = command.hidden;
 
         this.command_.addEventListener('labelChange', this);
         this.command_.addEventListener('disabledChange', this);
         this.command_.addEventListener('hiddenChange', this);
+        this.command_.addEventListener('checkedChange', this);
       }
     },
 
     /**
      * The text label.
      * @type {string}
      */
     get label() {
       return this.textContent;
     },
@@ skipping 33 matching lines @@
       switch (e.type) {
         case 'disabledChange':
           this.disabled = this.command.disabled;
           break;
         case 'hiddenChange':
           this.hidden = this.command.hidden;
           break;
         case 'labelChange':
           this.label = this.command.label;
           break;
+        case 'checkedChange':
+          this.checked = this.command.checked;
+          break;
       }
     }
   };
 
   /**
    * Whether the menu item is disabled or not.
    * @type {boolean}
    */
   cr.defineProperty(MenuItem, 'disabled', cr.PropertyKind.BOOL_ATTR);
 
   /**
    * Whether the menu item is hidden or not.
    * @type {boolean}
    */
   cr.defineProperty(MenuItem, 'hidden', cr.PropertyKind.BOOL_ATTR);
 
   /**
    * Whether the menu item is selected or not.
    * @type {boolean}
    */
   cr.defineProperty(MenuItem, 'selected', cr.PropertyKind.BOOL_ATTR);
 
+  /**
+   * Whether the menu item is checked or not.
+   * @type {boolean}
+   */
+  cr.defineProperty(MenuItem, 'checked', cr.PropertyKind.BOOL_ATTR);
+
   // Export
   return {
     MenuItem: MenuItem
   };
 });