Adding IceConfig option to assume TURN/TURN candidate pairs will work.

webrtc/p2p/base/tcpport.cc

Index: webrtc/p2p/base/tcpport.cc
diff --git a/webrtc/p2p/base/tcpport.cc b/webrtc/p2p/base/tcpport.cc
index 9a1caa25546bb6e4a0631de2aa4565e2e8a0e284..94ed851b13d31995ab57d29e9d875d749fe4f607 100644
--- a/webrtc/p2p/base/tcpport.cc
+++ b/webrtc/p2p/base/tcpport.cc
@@ -124,7 +124,8 @@ TCPPort::~TCPPort() {
 }
 
 Connection* TCPPort::CreateConnection(const Candidate& address,
-                                      CandidateOrigin origin) {
+                                      CandidateOrigin origin,
+                                      const IceConfig& config) {
   if (!SupportsProtocol(address.protocol())) {
     return NULL;
   }
@@ -158,9 +159,9 @@ Connection* TCPPort::CreateConnection(const Candidate& address,
   if (rtc::AsyncPacketSocket* socket =
       GetIncoming(address.address(), true)) {
     socket->SignalReadPacket.disconnect(this);
-    conn = new TCPConnection(this, address, socket);
+    conn = new TCPConnection(this, address, config, socket);
   } else {
-    conn = new TCPConnection(this, address);
+    conn = new TCPConnection(this, address, config);
   }
   AddOrReplaceConnection(conn);
   return conn;
@@ -305,8 +306,9 @@ void TCPPort::OnAddressReady(rtc::AsyncPacketSocket* socket,
 
 TCPConnection::TCPConnection(TCPPort* port,
                              const Candidate& candidate,
+                             const IceConfig& config,
                              rtc::AsyncPacketSocket* socket)
-    : Connection(port, 0, candidate),
+    : Connection(port, 0, candidate, config),
       socket_(socket),
       error_(0),
       outgoing_(socket == NULL),