Adding error handling to the connection flow.

remoting/client/chromoting_session.cc

Index: remoting/client/chromoting_session.cc
diff --git a/remoting/client/chromoting_session.cc b/remoting/client/chromoting_session.cc
index ae7eda4427d3f40838b823986ad58b825578bf45..f528701b749061e6e21ff947ed8ce59f4cfeb676 100644
--- a/remoting/client/chromoting_session.cc
+++ b/remoting/client/chromoting_session.cc
@@ -277,6 +277,10 @@ void ChromotingSession::OnConnectionState(
     client_->host_stub()->RequestPairing(request);
   }
 
+  if (state == protocol::ConnectionToHost::FAILED) {
+    remoting::SignalStrategy::Error err = signaling_->GetError();

[Yuwei, 2017/07/05 21:43:41]

Where is err used?

[nicholss, 2017/07/06 20:49:01]

Sorry, this was debug, I had already removed it in patch 3.

+  }
+
   runtime_->ui_task_runner()->PostTask(
       FROM_HERE, base::Bind(&ChromotingSession::Delegate::OnConnectionState,
                             delegate_, state, error));