Move test for enabling/disabling It2Me Share button

remoting/webapp/remoting.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.
 
 'use strict';
 
 /** @suppress {duplicate} */
 var remoting = remoting || {};
 
 /** @type {remoting.HostSession} */ remoting.hostSession = null;
@@ skipping 107 matching lines @@
  * @param {string} email The user's email address.
  * @return {void} Nothing.
  */
 remoting.onEmail = function(email) {
   document.getElementById('current-email').innerText = email;
   document.getElementById('get-started-it2me').disabled = false;
   document.getElementById('get-started-me2me').disabled = false;
 };
 
 /**
+ * Returns whether or not IT2Me is supported via the host NPAPI plugin.
+ *
+ * @return {boolean}
+ */
+function isIT2MeSupported_() {
+  var container = document.getElementById('host-plugin-container');
+  /** @type {remoting.HostPlugin} */
+  var plugin = remoting.HostSession.createPlugin();
+  container.appendChild(plugin);
+  var result = plugin.hasOwnProperty('REQUESTED_ACCESS_CODE');
+  container.removeChild(plugin);
+  return result;
+}
+
+/**
  * initHomeScreenUi is called if the app is not starting up in session mode,
  * and also if the user cancels pin entry or the connection in session mode.
  */
 remoting.initHomeScreenUi = function() {
   remoting.hostController = new remoting.HostController();
-  document.getElementById('share-button').disabled =
-      !remoting.hostController.isPluginSupported();
+  document.getElementById('share-button').disabled = !isIT2MeSupported_();
   remoting.setMode(remoting.AppMode.HOME);
   if (!remoting.oauth2.isAuthenticated()) {
     document.getElementById('auth-dialog').hidden = false;
   }
   remoting.hostSetupDialog =
       new remoting.HostSetupDialog(remoting.hostController);
   // Display the cached host list, then asynchronously update and re-display it.
   remoting.updateLocalHostState();
   remoting.hostList.refresh(remoting.updateLocalHostState);
   remoting.initSurvey();
@@ skipping 241 matching lines @@
 /**
  * Generate a nonce, to be used as an xsrf protection token.
  *
  * @return {string} A URL-Safe Base64-encoded 128-bit random value. */
 remoting.generateXsrfToken = function() {
   var random = new Uint8Array(16);
   window.crypto.getRandomValues(random);
   var base64Token = window.btoa(String.fromCharCode.apply(null, random));
   return base64Token.replace(/\+/g, '-').replace(/\//g, '_').replace(/=/g, '');
 };