Implement exponential backoff for failed Me2Me authentication attempts

remoting/protocol/jingle_messages.h

 // 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.
 
 #ifndef REMOTING_PROTOCOL_JINGLE_MESSAGES_H_
 #define REMOTING_PROTOCOL_JINGLE_MESSAGES_H_
 
 #include <list>
 #include <string>
 
@@ skipping 17 matching lines @@
   enum ActionType {
     UNKNOWN_ACTION,
     SESSION_INITIATE,
     SESSION_ACCEPT,
     SESSION_TERMINATE,
     SESSION_INFO,
     TRANSPORT_INFO,
   };
 
   enum Reason {
-    // Currently only termination reasons that can be sent by the host
-    // are understood. All others are converted to UNKNOWN_REASON.
     UNKNOWN_REASON,
     SUCCESS,
     DECLINE,
+    CANCEL,
     GENERAL_ERROR,
     INCOMPATIBLE_PARAMETERS,
   };
 
   JingleMessage();
   JingleMessage(const std::string& to_value,
                 ActionType action_value,
                 const std::string& sid_value);
   ~JingleMessage();
 
@@ skipping 51 matching lines @@
 
   ReplyType type;
   ErrorType error_type;
   std::string text;
 };
 
 }  // protocol
 }  // remoting
 
 #endif  // REMOTING_PROTOCOL_JINGLE_MESSAGES_H_