Remove ports that are not used by any channel after timeout

webrtc/p2p/base/portinterface.h

 /*
  *  Copyright 2012 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 void SetIceRole(IceRole role) = 0;
   virtual IceRole GetIceRole() const = 0;
 
   virtual void SetIceTiebreaker(uint64_t tiebreaker) = 0;
   virtual uint64_t IceTiebreaker() const = 0;
 
   virtual bool SharedSocket() const = 0;
 
   virtual bool SupportsProtocol(const std::string& protocol) const = 0;
 
+  // Called when this port starts to be used by a channel.
+  virtual void StartBeingUsed() = 0;
+  // Called when this port stops being used by a channel.
+  virtual void StopBeingUsed() = 0;
+
   // PrepareAddress will attempt to get an address for this port that other
   // clients can send to.  It may take some time before the address is ready.
   // Once it is ready, we will send SignalAddressReady.  If errors are
   // preventing the port from getting an address, it may send
   // SignalAddressError.
   virtual void PrepareAddress() = 0;
 
   // Returns the connection to the given address or NULL if none exists.
   virtual Connection* GetConnection(
       const rtc::SocketAddress& remote_addr) = 0;
@@ skipping 54 matching lines @@
 
   virtual std::string ToString() const = 0;
 
  protected:
   PortInterface() {}
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_P2P_BASE_PORTINTERFACE_H_