Refactor of Authenticator to allow it to ProcessMessage asynchronously and then call a callback

remoting/protocol/negotiating_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_NEGOTIATING_AUTHENTICATOR_H_
 #define REMOTING_PROTOCOL_NEGOTIATING_AUTHENTICATOR_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 24 matching lines @@
   // Creates a host authenticator, using a fixed shared secret/PIN hash.
   static scoped_ptr<Authenticator> CreateForHost(
       const std::string& local_cert,
       scoped_refptr<RsaKeyPair> key_pair,
       const std::string& shared_secret_hash,
       AuthenticationMethod::HashFunction hash_function);
 
   // Authenticator interface.
   virtual State state() const OVERRIDE;
   virtual RejectionReason rejection_reason() const OVERRIDE;
-  virtual void ProcessMessage(const buzz::XmlElement* message) OVERRIDE;
+  virtual void ProcessMessage(const base::Closure& resume_callback,
+                              const buzz::XmlElement* message) OVERRIDE;
   virtual scoped_ptr<buzz::XmlElement> GetNextMessage() OVERRIDE;
   virtual scoped_ptr<ChannelAuthenticator>
       CreateChannelAuthenticator() const OVERRIDE;
 
  private:
   NegotiatingAuthenticator(Authenticator::State initial_state);
 
   void AddMethod(const AuthenticationMethod& method);
   void CreateAuthenticator(State initial_state);
+  void UpdateState(const base::Closure& resume_callback);
 
   bool is_host_side() const;
 
   // Used only for host authenticators.
   std::string local_cert_;
   scoped_refptr<RsaKeyPair> key_pair_;
   std::string shared_secret_hash_;
 
   // Used only for client authenticators.
   std::string authentication_tag_;
   std::string shared_secret_;
 
   // Used for both host and client authenticators.
   std::vector<AuthenticationMethod> methods_;
   AuthenticationMethod current_method_;
   scoped_ptr<Authenticator> current_authenticator_;
   State state_;
   RejectionReason rejection_reason_;
 
   DISALLOW_COPY_AND_ASSIGN(NegotiatingAuthenticator);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_NEGOTIATING_AUTHENTICATOR_H_