Only try to pair protocol matching candidates for creating connections.

webrtc/p2p/base/tcpport.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 37 matching lines @@
   virtual ~TCPPort();
 
   virtual Connection* CreateConnection(const Candidate& address,
                                        CandidateOrigin origin);
 
   virtual void PrepareAddress();
 
   virtual int GetOption(rtc::Socket::Option opt, int* value);
   virtual int SetOption(rtc::Socket::Option opt, int value);
   virtual int GetError();
+  virtual bool SupportsProtocol(const std::string& protocol) const {
+    return protocol == TCP_PROTOCOL_NAME || protocol == SSLTCP_PROTOCOL_NAME;
+  }
 
  protected:
   TCPPort(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 105 matching lines @@
 
   // Allow test case to overwrite the default timeout period.
   int reconnection_timeout_;
 
   friend class TCPPort;
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_P2P_BASE_TCPPORT_H_