[Draft] Fix canceling pin prompt causes host overload

remoting/host/client_session.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/host/client_session.h"
 
 #include <algorithm>
 
 #include "base/message_loop/message_loop_proxy.h"
 #include "remoting/base/capabilities.h"
@@ skipping 192 matching lines @@
       } else {
         HOST_LOG << "gnubby auth is not enabled";
       }
       return;
     }
   }
   HOST_LOG << "Unexpected message received: "
             << message.type() << ": " << message.data();
 }
 
+void ClientSession::OnConnectionAuthenticating(
+    protocol::ConnectionToClient* connection) {
+  DCHECK(event_handler_);
+  event_handler_->OnSessionAuthenticating(this);
+}
+
 void ClientSession::OnConnectionAuthenticated(
     protocol::ConnectionToClient* connection) {
   DCHECK(CalledOnValidThread());
   DCHECK_EQ(connection_.get(), connection);
   DCHECK(!audio_scheduler_.get());
   DCHECK(!desktop_environment_);
   DCHECK(!input_injector_);
   DCHECK(!screen_controls_);
   DCHECK(!video_scheduler_.get());
 
@@ skipping 236 matching lines @@
     return scoped_ptr<AudioEncoder>(new AudioEncoderVerbatim());
   } else if (audio_config.codec == protocol::ChannelConfig::CODEC_OPUS) {
     return scoped_ptr<AudioEncoder>(new AudioEncoderOpus());
   }
 
   NOTREACHED();
   return scoped_ptr<AudioEncoder>();
 }
 
 }  // namespace remoting