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

webrtc/p2p/base/stunport.h

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 53 matching lines @@
     UDPPort* port =
         new UDPPort(thread, factory, network, ip, min_port, max_port, username,
                     password, origin, emit_local_for_anyaddress);
     if (!port->Init()) {
       delete port;
       port = NULL;
     }
     return port;
   }
 
-  virtual ~UDPPort();
+  ~UDPPort() override;
 
   rtc::SocketAddress GetLocalAddress() const {
     return socket_->GetLocalAddress();
   }
 
   const ServerAddresses& server_addresses() const {
     return server_addresses_;
   }
-  void
-  set_server_addresses(const ServerAddresses& addresses) {
+  void set_server_addresses(const ServerAddresses& addresses) {
     server_addresses_ = addresses;
   }
 
-  virtual void PrepareAddress();
+  void PrepareAddress() override;
 
-  virtual Connection* CreateConnection(const Candidate& address,
-                                       CandidateOrigin origin);
-  virtual int SetOption(rtc::Socket::Option opt, int value);
-  virtual int GetOption(rtc::Socket::Option opt, int* value);
-  virtual int GetError();
+  Connection* CreateConnection(const Candidate& address,
+                               CandidateOrigin origin,
+                               const IceConfig& config) override;
+  int SetOption(rtc::Socket::Option opt, int value) override;
+  int GetOption(rtc::Socket::Option opt, int* value) override;
+  int GetError() override;
 
-  virtual bool HandleIncomingPacket(
-      rtc::AsyncPacketSocket* socket, const char* data, size_t size,
-      const rtc::SocketAddress& remote_addr,
-      const rtc::PacketTime& packet_time) {
+  bool HandleIncomingPacket(rtc::AsyncPacketSocket* socket,
+                            const char* data,
+                            size_t size,
+                            const rtc::SocketAddress& remote_addr,
+                            const rtc::PacketTime& packet_time) override {
     // All packets given to UDP port will be consumed.
     OnReadPacket(socket, data, size, remote_addr, packet_time);
     return true;
   }
-  virtual bool SupportsProtocol(const std::string& protocol) const {
+  bool SupportsProtocol(const std::string& protocol) const override {
     return protocol == UDP_PROTOCOL_NAME;
   }
 
   void set_stun_keepalive_delay(int delay) {
     stun_keepalive_delay_ = delay;
   }
   int stun_keepalive_delay() const {
     return stun_keepalive_delay_;
   }
 
@@ skipping 23 matching lines @@
           rtc::PacketSocketFactory* factory,
           rtc::Network* network,
           rtc::AsyncPacketSocket* socket,
           const std::string& username,
           const std::string& password,
           const std::string& origin,
           bool emit_local_for_anyaddress);
 
   bool Init();
 
-  virtual int SendTo(const void* data, size_t size,
-                     const rtc::SocketAddress& addr,
-                     const rtc::PacketOptions& options,
-                     bool payload);
+  int SendTo(const void* data,
+             size_t size,
+             const rtc::SocketAddress& addr,
+             const rtc::PacketOptions& options,
+             bool payload) override;
 
-  virtual void UpdateNetworkCost();
+  void UpdateNetworkCost() override;
 
   void OnLocalAddressReady(rtc::AsyncPacketSocket* socket,
                            const rtc::SocketAddress& address);
   void OnReadPacket(rtc::AsyncPacketSocket* socket,
                     const char* data, size_t size,
                     const rtc::SocketAddress& remote_addr,
                     const rtc::PacketTime& packet_time);
 
   void OnSentPacket(rtc::AsyncPacketSocket* socket,
-                    const rtc::SentPacket& sent_packet);
+                    const rtc::SentPacket& sent_packet) override;
 
   void OnReadyToSend(rtc::AsyncPacketSocket* socket);
 
   // This method will send STUN binding request if STUN server address is set.
   void MaybePrepareStunCandidate();
 
   void SendStunBindingRequests();
 
   // Helper function which will set |addr|'s IP to the default local address if
   // |addr| is the "any" address and |emit_local_for_anyaddress_| is true. When
@@ skipping 95 matching lines @@
                                   ip, min_port, max_port,
                                   username, password, servers,
                                   origin);
     if (!port->Init()) {
       delete port;
       port = NULL;
     }
     return port;
   }
 
-  virtual ~StunPort() {}
+  ~StunPort() override {}
 
-  virtual void PrepareAddress() {
-    SendStunBindingRequests();
-  }
+  void PrepareAddress() override { SendStunBindingRequests(); }
 
  protected:
   StunPort(rtc::Thread* thread,
            rtc::PacketSocketFactory* factory,
            rtc::Network* network,
            const rtc::IPAddress& ip,
            uint16_t min_port,
            uint16_t max_port,
            const std::string& username,
            const std::string& password,
@@ skipping 11 matching lines @@
                 false) {
     // UDPPort will set these to local udp, updating these to STUN.
     set_type(STUN_PORT_TYPE);
     set_server_addresses(servers);
   }
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_P2P_BASE_STUNPORT_H_