Allow TransportController to create a QuicTransportChannel

webrtc/p2p/quic/quictransportchannel.h

Index: webrtc/p2p/quic/quictransportchannel.h
diff --git a/webrtc/p2p/quic/quictransportchannel.h b/webrtc/p2p/quic/quictransportchannel.h
index 430ed8d9c46ca2330c3fa0078f70f4470d2cccb1..e27df209e7ae0bfbf56d5cebce331ddd12e58c63 100644
--- a/webrtc/p2p/quic/quictransportchannel.h
+++ b/webrtc/p2p/quic/quictransportchannel.h
@@ -212,6 +212,8 @@ class QuicTransportChannel : public TransportChannelImpl,
   QuicTransportState quic_state() const { return quic_state_; }
   // Creates a new QUIC stream that can send data.
   ReliableQuicStream* CreateQuicStream();
+  // Needed by QuicTransport.
+  TransportChannelImpl* channel() const { return channel_; }

[honghaiz3, 2016/04/29 22:26:52]

Seems that this method is only used to delete the p2ptransportchannel.
Can we just make the quictransport channel owns the p2ptransportchannel so that
when the quictransportchannel is deleted, it delete the p2ptransportchannel?
That way, we don't need this method. 

[mikescarlett, 2016/04/29 23:17:01]

I made the QuicTransportChannel own the P2PTransportChannel.

 
   // Emitted when |quic_| creates a QUIC stream to receive data from the remote
   // peer, when the stream did not exist previously.