Implement exponential backoff for failed Me2Me authentication attempts

remoting/webapp/client_screen.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
  * Functions related to the 'client screen' for Chromoting.
  */
 
 'use strict';
@@ skipping 219 matching lines @@
       retryConnectOrReportOffline_();
     } else if (remoting.clientSession.error ==
                remoting.ClientSession.ConnectionError.SESSION_REJECTED) {
       showConnectError_(remoting.Error.INVALID_ACCESS_CODE);
     } else if (remoting.clientSession.error ==
                remoting.ClientSession.ConnectionError.INCOMPATIBLE_PROTOCOL) {
       showConnectError_(remoting.Error.INCOMPATIBLE_PROTOCOL);
     } else if (remoting.clientSession.error ==
                remoting.ClientSession.ConnectionError.NETWORK_FAILURE) {
       showConnectError_(remoting.Error.NETWORK_FAILURE);
+    } else if (remoting.clientSession.error ==
+               remoting.ClientSession.ConnectionError.HOST_IS_DISABLED) {
+      showConnectError_(remoting.Error.HOST_IS_DISABLED);
     } else {
       showConnectError_(remoting.Error.GENERIC);
     }
 
     if (clearPin) {
       document.getElementById('pin-entry').value = '';
     }
 
   } else {
     console.error('Unexpected client plugin state: ' + newState);
@@ skipping 256 matching lines @@
             pin, 'spake2_hmac,spake2_plain', remoting.hostId,
             /** @type {string} */ (remoting.oauth2.getCachedEmail()),
             remoting.ClientSession.Mode.ME2ME, onClientStateChange_);
     remoting.clientSession.createPluginAndConnect(
         document.getElementById('session-mode'),
         token);
   } else {
     showConnectError_(remoting.Error.AUTHENTICATION_FAILED);
   }
 }