Add device policy to disallow shutdown - ash UI modifications

chrome/browser/resources/chromeos/login/login_common.js

 // Copyright 2013 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 Common OOBE controller methods.
  */
 
 <include src="test_util.js">
 <include src="../../../../../ui/login/screen.js">
@@ skipping 92 matching lines @@
       window.setTimeout(showHeaderBar, HEADER_BAR_DELAY_MS);
     } else {
       document.body.classList.remove('oobe-display');
       Oobe.getInstance().prepareForLoginDisplay_();
     }
 
     Oobe.getInstance().headerHidden = false;
   };
 
   /**
+   * When |showShutdown| is set to "true", the shutdown button is shown and the
+   * reboot button hidden. If set to "false", the reboot button is visible and
+   * the shutdown button hidden.
+   */
+  Oobe.showShutdown = function(showShutdown) {
+    $('login-header-bar').showShutdownButton = showShutdown;
+    $('login-header-bar').showRebootButton = !showShutdown;
+  };
+
+  /**
    * Enables keyboard driven flow.
    */
   Oobe.enableKeyboardFlow = function(value) {
     // Don't show header bar for OOBE.
     Oobe.getInstance().forceKeyboardFlow = value;
   };
 
   /**
    * Disables signin UI.
    */
@@ skipping 253 matching lines @@
   document.addEventListener('DOMContentLoaded', function() {
     if (!window['WAIT_FOR_POLYMER']) {
       initializeOobe();
       return;
     }
     window.addEventListener('polymer-ready', function() {
       initializeOobe();
     });
   });
 })();