kiosk: Network connectivity test during launch.

chrome/browser/resources/chromeos/login/screen_error_message.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.
 
 /**
  * @fileoverview Offline message screen implementation.
  */
 
 login.createScreen('ErrorMessageScreen', 'error-message', function() {
   // Link which starts guest session for captive portal fixing.
@@ skipping 147 matching lines @@
       cr.ui.DropDown.hide('offline-networks-list');
     },
 
     /**
      * Buttons in oobe wizard's button strip.
      * @type {array} Array of Buttons.
      */
     get buttons() {
       var buttons = [];
 
+      var rebootButton = this.ownerDocument.createElement('button');
+      rebootButton.textContent = loadTimeData.getString('rebootButton');
+      rebootButton.classList.add('show-with-ui-state-kiosk-mode');
+      rebootButton.addEventListener('click', function(e) {
+        chrome.send('rebootButtonClicked');
+        e.stopPropagation();
+      });
+      buttons.push(rebootButton);
+
+      var spacer = this.ownerDocument.createElement('div');
+      spacer.classList.add('button-spacer');
+      spacer.classList.add('show-with-ui-state-kiosk-mode');
+      buttons.push(spacer);
+
       var powerwashButton = this.ownerDocument.createElement('button');
       powerwashButton.id = 'error-message-restart-and-powerwash-button';
       powerwashButton.textContent =
         loadTimeData.getString('localStateErrorPowerwashButton');
       powerwashButton.classList.add('show-with-ui-state-local-state-error');
       powerwashButton.addEventListener('click', function(e) {
         chrome.send('localStateErrorPowerwashButtonClicked');
         e.stopPropagation();
       });
       buttons.push(powerwashButton);
@@ skipping 73 matching lines @@
       * Sets current error state of the screen.
       * @param {number} error_state New error state of the screen.
       * @param {string} network Name of the current network
       * @private
       */
     setErrorState: function(error_state, network) {
       this.setErrorState_(ERROR_STATES[error_state], network);
     }
   };
 });