Allow p2p UDP packages to set DSCP

net/udp/datagram_server_socket.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_UDP_DATAGRAM_SERVER_SOCKET_H_
 #define NET_UDP_DATAGRAM_SERVER_SOCKET_H_
 
 #include "net/base/completion_callback.h"
 #include "net/base/net_util.h"
 #include "net/udp/datagram_socket.h"
@@ skipping 75 matching lines @@
   // Should be called before Bind().
   // Returns a network error code.
   virtual int SetMulticastTimeToLive(int time_to_live) = 0;
 
   // Set the loopback flag for UDP socket. If this flag is true, the host
   // will receive packets sent to the joined group from itself.
   // The default value of this option is true.
   // Should be called before Bind().
   // Returns a network error code.
   virtual int SetMulticastLoopbackMode(bool loopback) = 0;
+
+  // Set the Differentiated Services Code Point. May do nothing on
+  // some platforms. Returns a network error code.
+  virtual int SetDiffServCodePoint(DiffServCodePoint dscp) = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_UDP_DATAGRAM_SERVER_SOCKET_H_