Adds functionality to pack an extension / app from the app.

chrome/browser/resources/apps_debugger/js/items_list.js

 // Copyright (c) 2012 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('apps_dev_tool', function() {
   'use strict';
 
   /* Creates a new list of items.
    * @param {Object=} opt_propertyBag Optional properties.
    * @constructor
@@ skipping 181 matching lines @@
      * @private
      */
     setEnabledCheckbox_: function(item, el) {
       var enable = el.querySelector('.enable-checkbox');
       enable.hidden = false;
       enable.querySelector('input').disabled = !item.may_disable;
 
       if (item.may_disable) {
         enable.addEventListener('click', function(e) {
           chrome.developerPrivate.enable(
-              item.id, e.target.checked, loadItemsInfo);
+              item.id, !!e.target.checked, loadItemsInfo);
         });
       }
 
       enable.querySelector('input').checked = item.enabled;
     },
 
 
     /**
      * Sets the handler for the allow_file_access checkbox.
      * @param {!object} item A dictionary of item metadata.
@@ skipping 48 matching lines @@
           }
         });
       }
     }
   };
 
   return {
     ItemsList: ItemsList,
   };
 });