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

remoting/protocol/v2_authenticator.h

Index: remoting/protocol/v2_authenticator.h
diff --git a/remoting/protocol/v2_authenticator.h b/remoting/protocol/v2_authenticator.h
index ef6503c26c8b4fc15f9a980eecb184cd55eeb595..fdc86be3d24c39a6bdb73344840c34694fd6909c 100644
--- a/remoting/protocol/v2_authenticator.h
+++ b/remoting/protocol/v2_authenticator.h
@@ -40,7 +40,8 @@ class V2Authenticator : public Authenticator {
   // 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 buzz::XmlElement* message,
+                              const base::Closure& resume_callback) OVERRIDE;
   virtual scoped_ptr<buzz::XmlElement> GetNextMessage() OVERRIDE;
   virtual scoped_ptr<ChannelAuthenticator>
       CreateChannelAuthenticator() const OVERRIDE;
@@ -52,6 +53,8 @@ class V2Authenticator : public Authenticator {
                   const std::string& shared_secret,
                   State initial_state);
 
+  virtual void ProcessMessageInternal(const buzz::XmlElement* message);
+
   bool is_host_side() const;
 
   // Used only for host authenticators.