Add support of IP_MULTICAST_IF in UDP sockets.

net/udp/udp_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_SOCKET_UDP_SERVER_SOCKET_H_
 #define NET_SOCKET_UDP_SERVER_SOCKET_H_
 
 #include "net/base/completion_callback.h"
 #include "net/base/net_util.h"
 #include "net/udp/datagram_server_socket.h"
 #include "net/udp/udp_socket.h"
 
 namespace net {
 
 class IPEndPoint;
 class BoundNetLog;
 
 // A client socket that uses UDP as the transport layer.
 class NET_EXPORT UDPServerSocket : public DatagramServerSocket {
  public:
-  UDPServerSocket(net::NetLog* net_log,
-                  const net::NetLog::Source& source);
+  UDPServerSocket(net::NetLog* net_log, const net::NetLog::Source& source);
   virtual ~UDPServerSocket();
 
   // Implement DatagramServerSocket:
   virtual int Listen(const IPEndPoint& address) OVERRIDE;
   virtual int RecvFrom(IOBuffer* buf,
                        int buf_len,
                        IPEndPoint* address,
                        const CompletionCallback& callback) OVERRIDE;
   virtual int SendTo(IOBuffer* buf,
                      int buf_len,
                      const IPEndPoint& address,
                      const CompletionCallback& callback) OVERRIDE;
   virtual bool SetReceiveBufferSize(int32 size) OVERRIDE;
   virtual bool SetSendBufferSize(int32 size) OVERRIDE;
   virtual void Close() OVERRIDE;
   virtual int GetPeerAddress(IPEndPoint* address) const OVERRIDE;
   virtual int GetLocalAddress(IPEndPoint* address) const OVERRIDE;
   virtual const BoundNetLog& NetLog() const OVERRIDE;
   virtual void AllowAddressReuse() OVERRIDE;
   virtual void AllowBroadcast() OVERRIDE;
   virtual int JoinGroup(const IPAddressNumber& group_address) const OVERRIDE;
   virtual int LeaveGroup(const IPAddressNumber& group_address) const OVERRIDE;
+  virtual int SetMulticastInterface(uint32 interface_index) OVERRIDE;
   virtual int SetMulticastTimeToLive(int time_to_live) OVERRIDE;
   virtual int SetMulticastLoopbackMode(bool loopback) OVERRIDE;
   virtual int SetDiffServCodePoint(DiffServCodePoint dscp) OVERRIDE;
 
  private:
   UDPSocket socket_;
   DISALLOW_COPY_AND_ASSIGN(UDPServerSocket);
 };
 
 }  // namespace net
 
 #endif  // NET_SOCKET_UDP_SERVER_SOCKET_H_