Download the host components when user tries to enable Me2Me host.

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 132 matching lines @@
 /**
  * Returns whether or not IT2Me is supported via the host NPAPI plugin.
  *
  * @return {boolean}
  */
 function isIT2MeSupported_() {
   // Currently, IT2Me on Chromebooks is not supported.
   return !remoting.runningOnChromeOS();
 }
 
+// TODO(sergeyu): We want to show Me2Me host controls only on some Linux
+// distributions that we know work properly with the chromoting host. Implement
+// dome detection mechanism and apply it here.
+remoting.supportLinuxDistibutionDetected_ = false;

[Jamie, 2014/01/31 18:39:15]

s/support/supported/

[Sergey Ulanov, 2014/01/31 23:34:17]

Done.

+
+remoting.isMe2MeSupported = function isMe2MeSupported() {
+  var platform = navigator.platform;
+
+  // Currently Me2Me is supported on Windows, OSX and some versions of Linux.
+  return platform == "Win32" || platform == "MacIntel" ||
+           ((platform == "Linux x86_64" || platform == "Linux i386") &&
+            remoting.supportLinuxDistibutionDetected_ &&
+            !remoting.runningOnChromeOS());

[Jamie, 2014/01/31 18:39:15]

Does ChromeOS report itself as Linux? If so, then there's no need to check for
it explicitly--it will presumably be excluded by the
supportedLinuxDistributionDetected check.

[Sergey Ulanov, 2014/01/31 23:34:17]

Yes, ChromeOS reports itself as Linux (blink uses uname() for
navigator.platform, except on mac and windows). I think it's still better to
have this check explicitly here, for the future when we remove
remoting.supportLinuxDistibutionDetected_.

+}
+
 /**
  * Display the user's email address and allow access to the rest of the app,
  * including parsing URL parameters.
  *
  * @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;
@@ skipping 293 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, '');
 };