[Draft] Fix canceling pin prompt causes host overload

remoting/host/client_session.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_HOST_CLIENT_SESSION_H_
 #define REMOTING_HOST_CLIENT_SESSION_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
@@ skipping 36 matching lines @@
 // per-client state.
 class ClientSession
     : public base::NonThreadSafe,
       public protocol::HostStub,
       public protocol::ConnectionToClient::EventHandler,
       public ClientSessionControl {
  public:
   // Callback interface for passing events to the ChromotingHost.
   class EventHandler {
    public:
+    // Called after authentication has started.
+    virtual void OnSessionAuthenticating(ClientSession* client) = 0;
+
     // Called after authentication has finished successfully. Returns true if
     // the connection is allowed, or false otherwise.
     virtual bool OnSessionAuthenticated(ClientSession* client) = 0;
 
     // Called after we've finished connecting all channels.
     virtual void OnSessionChannelsConnected(ClientSession* client) = 0;
 
     // Called after authentication has failed. Must not tear down this
     // object. OnSessionClosed() is notified after this handler
     // returns.
@@ skipping 41 matching lines @@
   virtual void ControlAudio(
       const protocol::AudioControl& audio_control) OVERRIDE;
   virtual void SetCapabilities(
       const protocol::Capabilities& capabilities) OVERRIDE;
   virtual void RequestPairing(
       const remoting::protocol::PairingRequest& pairing_request) OVERRIDE;
   virtual void DeliverClientMessage(
       const protocol::ExtensionMessage& message) OVERRIDE;
 
   // protocol::ConnectionToClient::EventHandler interface.
+  virtual void OnConnectionAuthenticating(
+      protocol::ConnectionToClient* connection) OVERRIDE;
   virtual void OnConnectionAuthenticated(
       protocol::ConnectionToClient* connection) OVERRIDE;
   virtual void OnConnectionChannelsConnected(
       protocol::ConnectionToClient* connection) OVERRIDE;
   virtual void OnConnectionClosed(protocol::ConnectionToClient* connection,
                                   protocol::ErrorCode error) OVERRIDE;
   virtual void OnSequenceNumberUpdated(
       protocol::ConnectionToClient* connection, int64 sequence_number) OVERRIDE;
   virtual void OnRouteChange(
       protocol::ConnectionToClient* connection,
@@ skipping 110 matching lines @@
 
   // Used to proxy gnubby auth traffic.
   scoped_ptr<GnubbyAuthHandler> gnubby_auth_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(ClientSession);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_CLIENT_SESSION_H_