Propagate connection state from networking layer to UI.

remoting/protocol/libjingle_transport_factory.cc

Index: remoting/protocol/libjingle_transport_factory.cc
diff --git a/remoting/protocol/libjingle_transport_factory.cc b/remoting/protocol/libjingle_transport_factory.cc
index b36d8cb795e991c8cac2546c84af281a1281f5f7..597c8b5e121329e9f7eb9c97af466bf33899629d 100644
--- a/remoting/protocol/libjingle_transport_factory.cc
+++ b/remoting/protocol/libjingle_transport_factory.cc
@@ -58,6 +58,7 @@ class LibjingleStreamTransport : public StreamTransport,
                         const cricket::Candidate& candidate);
   void OnRouteChange(cricket::TransportChannel* channel,
                      const cricket::Candidate& candidate);
+  void OnWritableState(cricket::TransportChannel* channel);
 
   void OnTcpConnected(int result);
   void OnAuthenticationDone(net::Error error,
@@ -146,6 +147,8 @@ void LibjingleStreamTransport::Connect(
       this, &LibjingleStreamTransport::OnCandidateReady);
   channel_->SignalRouteChange.connect(
       this, &LibjingleStreamTransport::OnRouteChange);
+  channel_->SignalWritableState.connect(
+      this, &LibjingleStreamTransport::OnWritableState);
   channel_->set_incoming_only(incoming_only_);
 
   channel_->Connect();
@@ -238,6 +241,11 @@ void LibjingleStreamTransport::OnRouteChange(
   event_handler_->OnTransportRouteChange(this, route);
 }
 
+void LibjingleStreamTransport::OnWritableState(
+    cricket::TransportChannel* channel) {
+  event_handler_->OnTransportInactive(this, !channel->writable());

[Wez, 2012/07/16 18:51:23]

You're picking up whether a channel is "active" from whether or not it's
writable; that will work for UDP channels but if we ever re-enable TCP channels
then the channel will become un-writable when the TCP buffer is full, surely?

[Sergey Ulanov, 2012/07/17 01:17:17]

Libjingle marks a channel as not-writable when it failed to receive pings on
that channel for more than five seconds. pings are sent every second. It works
the same for both UDP and TCP-based connections.

+}
+
 void LibjingleStreamTransport::OnTcpConnected(int result) {
   DCHECK(CalledOnValidThread());