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 6013995d881d6602627f134862bd4606a5344d18..4a2abd6cf806cf9b38a36b36c406da014329b99e 100644
--- a/remoting/protocol/v2_authenticator.h
+++ b/remoting/protocol/v2_authenticator.h
@@ -37,7 +37,8 @@ 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 base::Closure& resume_callback,
+                              const buzz::XmlElement* message) OVERRIDE;
   virtual scoped_ptr<buzz::XmlElement> GetNextMessage() OVERRIDE;
   virtual scoped_ptr<ChannelAuthenticator>
       CreateChannelAuthenticator() const OVERRIDE;
@@ -49,6 +50,8 @@ 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.