Add enable-app-shims to chrome://flags.

chrome/browser/resources/ntp4/apps_page.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('ntp', function() {
   'use strict';
 
   var APP_LAUNCH = {
     // The histogram buckets (keep in sync with extension_constants.h).
     NTP_APPS_MAXIMIZED: 0,
@@ skipping 55 matching lines @@
       this.options_ = this.appendMenuItem_('appoptions');
       this.details_ = this.appendMenuItem_('appdetails');
       this.uninstall_ = this.appendMenuItem_('appuninstall');
       this.options_.addEventListener('activate',
                                      this.onShowOptions_.bind(this));
       this.details_.addEventListener('activate',
                                      this.onShowDetails_.bind(this));
       this.uninstall_.addEventListener('activate',
                                        this.onUninstall_.bind(this));
 
-      if (!(cr.isChromeOS || cr.isMac)) {
+      if (!cr.isChromeOS) {
         this.createShortcutSeparator_ =
             menu.appendChild(cr.ui.MenuItem.createSeparator());
         this.createShortcut_ = this.appendMenuItem_('appcreateshortcut');
         this.createShortcut_.addEventListener(
             'activate', this.onCreateShortcut_.bind(this));
       }
 
       document.body.appendChild(menu);
     },
 
@@ skipping 46 matching lines @@
         launchTypeButton.checked = app.appData.launch_type == id;
         launchTypeButton.hidden = app.appData.packagedApp;
       });
 
       this.launchTypeMenuSeparator_.hidden = app.appData.packagedApp;
 
       this.options_.disabled = !app.appData.optionsUrl || !app.appData.enabled;
       this.details_.disabled = !app.appData.detailsUrl;
       this.uninstall_.disabled = !app.appData.mayDisable;
 
-      if (this.createShortcut_ && cr.isMac) {
+      if (cr.isMac) {
         // On Windows and Linux, these should always be visible. On ChromeOS,
         // they are never created. On Mac, shortcuts can only be created for
-        // new-style packaged apps, so hide the menu item.
+        // new-style packaged apps, so hide the menu item. Also check if
+        // loadTimeData explicitly disables this as the feature is not yet
+        // enabled by default on Mac.
         this.createShortcutSeparator_.hidden = this.createShortcut_.hidden =
-            !app.appData.packagedApp;
+            !app.appData.packagedApp ||
+            loadTimeData.getBoolean('disableCreateAppShortcut');
       }
     },
 
     /**
      * Handlers for menu item activation.
      * @param {Event} e The activation event.
      * @private
      */
     onLaunch_: function(e) {
       chrome.send('launchApp', [this.app_.appId, APP_LAUNCH.NTP_APPS_MENU]);
@@ skipping 590 matching lines @@
   function launchAppAfterEnable(appId) {
     chrome.send('launchApp', [appId, APP_LAUNCH.NTP_APP_RE_ENABLE]);
   }
 
   return {
     APP_LAUNCH: APP_LAUNCH,
     AppsPage: AppsPage,
     launchAppAfterEnable: launchAppAfterEnable,
   };
 });