Make the mapping from client id -> secret asynchronous.

remoting/protocol/pairing_host_authenticator.h

 // Copyright 2013 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_PAIRING_HOST_AUTHENTICATOR_H_
 #define REMOTING_PROTOCOL_PAIRING_HOST_AUTHENTICATOR_H_
 
 #include "base/memory/weak_ptr.h"
 #include "remoting/protocol/pairing_authenticator_base.h"
+#include "remoting/protocol/pairing_registry.h"
 
 namespace remoting {
 
 class RsaKeyPair;
 
 namespace protocol {
 
 class PairingRegistry;
 
 class PairingHostAuthenticator : public PairingAuthenticatorBase {
@@ skipping 11 matching lines @@
   virtual void ProcessMessage(const buzz::XmlElement* message,
                               const base::Closure& resume_callback) OVERRIDE;
 
  private:
   // PairingAuthenticatorBase interface.
   virtual void CreateV2AuthenticatorWithPIN(
       State initial_state,
       const SetAuthenticatorCallback& callback) OVERRIDE;
   virtual void AddPairingElements(buzz::XmlElement* message) OVERRIDE;
 
+  // Continue processing a protocol message once the pairing information for
+  // the client id has been received.
+  void ProcessMessageWithPairing(const buzz::XmlElement* message,
+                                 const base::Closure& resume_callback,
+                                 PairingRegistry::Pairing pairing);
+
   // Protocol state.
   scoped_refptr<PairingRegistry> pairing_registry_;
   std::string local_cert_;
   scoped_refptr<RsaKeyPair> key_pair_;
   const std::string& pin_;
   bool protocol_error_;
+  bool waiting_for_paired_secret_;
 
   base::WeakPtrFactory<PairingHostAuthenticator> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PairingHostAuthenticator);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_PAIRING_AUTHENTICATOR_H_