Adding a new authenticator which can be used to validate the remote user

remoting/protocol/authenticator.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_AUTHENTICATOR_H_
 #define REMOTING_PROTOCOL_AUTHENTICATOR_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 49 matching lines @@
     REJECTED,
 
     // Asynchronously processing the last message from the peer.
     PROCESSING_MESSAGE,
   };
 
   enum RejectionReason {
     INVALID_CREDENTIALS,
     INVALID_ACCOUNT,
     PROTOCOL_ERROR,
+    REJECTED_BY_USER,
   };
 
   // Callback used for layered Authenticator implementations, particularly
   // third-party and pairing authenticators. They use this callback to create
   // base SPAKE2 authenticators.
   typedef base::Callback<std::unique_ptr<Authenticator>(
       const std::string& shared_secret,
       Authenticator::State initial_state)>
       CreateBaseAuthenticatorCallback;
 
@@ skipping 59 matching lines @@
   // for the result of this method.
   virtual std::unique_ptr<Authenticator> CreateAuthenticator(
       const std::string& local_jid,
       const std::string& remote_jid) = 0;
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_AUTHENTICATOR_H_