Introduce rtc::PacketTransportInterface and let cricket::TransportChannel inherit.

webrtc/p2p/base/transportcontroller.cc

Index: webrtc/p2p/base/transportcontroller.cc
diff --git a/webrtc/p2p/base/transportcontroller.cc b/webrtc/p2p/base/transportcontroller.cc
index 1dc7ca789acd56956775b669ce9620aed0b51836..636067cb9ab96e67e0ef54503d51202bce17dea3 100644
--- a/webrtc/p2p/base/transportcontroller.cc
+++ b/webrtc/p2p/base/transportcontroller.cc
@@ -565,11 +565,11 @@ bool TransportController::GetStats_n(const std::string& transport_name,
   return transport->GetStats(stats);
 }
 
-void TransportController::OnChannelWritableState_n(TransportChannel* channel) {
+void TransportController::OnChannelWritableState_n(rtc::PacketTransport* pt) {
   RTC_DCHECK(network_thread_->IsCurrent());
-  LOG(LS_INFO) << channel->transport_name() << " TransportChannel "
-               << channel->component() << " writability changed to "
-               << channel->writable() << ".";
+  LOG(LS_INFO) << pt->transport_name() << " TransportChannel "
+               << pt->component() << " writability changed to "
+               << pt->writable() << ".";

[pthatcher1, 2016/10/13 20:26:37]

We probably want to make this less ICE-specific, with something like:

LOG(LS_INFO) << "Transport " << transport->debug_name() << " writability changed
to " << transport->writable();

Then a TransportChannel can make debug_name() return a transport_name() +
component().

[johan, 2016/10/14 16:09:33]

Done.

   UpdateAggregateStates_n();
 }