Support for guest signin and new user accounts in gaia signin screen.

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

 // Copyright (c) 2011 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 Oobe signin screen implementation.
  */
 
 cr.define('login', function() {
 
@@ skipping 16 matching lines @@
   };
 
   GaiaSigninScreen.prototype = {
     __proto__: HTMLDivElement.prototype,
 
     // Authentication extension's start page URL.
     extension_url_: null,
 
     /** @inheritDoc */
     decorate: function() {
+      $('createAccount').onclick = function() {
+        chrome.send('createAccount');
+      };
+      $('guestSignin').onclick = function() {
+        chrome.send('launchIncognito');
+      };
     },
 
     /**
      * Header text of the screen.
      * @type {string}
      */
     get header() {
       return localStrings.getString('signinScreenTitle');
     },
 
     /**
      * Event handler that is invoked just before the frame is shown.
      * @param data {string} Screen init payload. Url of auth extension start
      *        page.
      */
     onBeforeShow: function(data) {
       console.log('Opening extension: ' + data.startUrl +
                   ', opt_email=' + data.email);
       var frame = $('signin-frame');
       frame.addEventListener('load', function(e) {
         console.log('Frame loaded: ' + data.startUrl);
       });
       frame.contentWindow.location.href = data.startUrl;
       this.extension_url_ = data.startUrl;
       // TODO(xiyuan): Pre-populate Gaia with data.email (if any).
+
+      $('createAccount').hidden = !data.createAccount;
+      $('guestSignin').hidden = !data.guestSignin;
     },
 
     /**
      * Checks if message comes from the loaded authentication extension.
      * @param e {object} Payload of the received HTML5 message.
      * @type {bool}
      */
     isAuthExtMessage_: function(e) {
       return this.extension_url_ != null &&
           this.extension_url_.indexOf(e.origin) == 0 &&
@@ skipping 18 matching lines @@
     reset: function(takeFocus) {
       // Reload and show the sign-in UI.
       Oobe.showSigninUI();
     }
   };
 
   return {
     GaiaSigninScreen: GaiaSigninScreen
   };
 });