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

remoting/protocol/me2me_host_authenticator_factory.cc

 // 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.
 
 #include "remoting/protocol/me2me_host_authenticator_factory.h"
 
 #include "base/base64.h"
 #include "base/string_util.h"
 #include "remoting/base/rsa_key_pair.h"
 #include "remoting/protocol/channel_authenticator.h"
@@ skipping 16 matching lines @@
 
   virtual State state() const OVERRIDE {
     return state_;
   }
 
   virtual RejectionReason rejection_reason() const OVERRIDE {
     DCHECK_EQ(state_, REJECTED);
     return INVALID_CREDENTIALS;
   }
 
-  virtual void ProcessMessage(const buzz::XmlElement* message) OVERRIDE {
+  virtual void ProcessMessage(const base::Closure& resume_callback,
+                              const buzz::XmlElement* message) OVERRIDE {
     DCHECK_EQ(state_, WAITING_MESSAGE);
     state_ = REJECTED;
+    resume_callback.Run();
   }
 
   virtual scoped_ptr<buzz::XmlElement> GetNextMessage() OVERRIDE {
     NOTREACHED();
     return scoped_ptr<buzz::XmlElement>(NULL);
   }
 
   virtual scoped_ptr<ChannelAuthenticator>
   CreateChannelAuthenticator() const OVERRIDE {
     NOTREACHED();
@@ skipping 39 matching lines @@
     return scoped_ptr<Authenticator>(new RejectingAuthenticator());
   }
 
   return NegotiatingAuthenticator::CreateForHost(
       local_cert_, key_pair_, shared_secret_hash_.value,
       shared_secret_hash_.hash_function);
 }
 
 }  // namespace protocol
 }  // namespace remoting