Add support of IP_MULTICAST_IF in UDP sockets.

content/browser/renderer_host/p2p/socket_host_udp_unittest.cc

 // 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.
 
 #include "content/browser/renderer_host/p2p/socket_host_udp.h"
 
 #include <deque>
 #include <vector>
 
 #include "base/logging.h"
@@ skipping 122 matching lines @@
     NOTIMPLEMENTED();
     return net::ERR_NOT_IMPLEMENTED;
   }
 
   virtual int LeaveGroup(
       const net::IPAddressNumber& group_address) const OVERRIDE {
     NOTIMPLEMENTED();
     return net::ERR_NOT_IMPLEMENTED;
   }
 
+  virtual int SetMulticastInterface(uint32 interface_index) OVERRIDE {
+    NOTIMPLEMENTED();
+    return net::ERR_NOT_IMPLEMENTED;
+  }
+
   virtual int SetMulticastTimeToLive(int time_to_live) OVERRIDE {
     NOTIMPLEMENTED();
     return net::ERR_NOT_IMPLEMENTED;
   }
 
   virtual int SetMulticastLoopbackMode(bool loopback) OVERRIDE {
     NOTIMPLEMENTED();
     return net::ERR_NOT_IMPLEMENTED;
   }
 
@@ skipping 209 matching lines @@
   socket_host_->Send(dest3, packet1, net::DSCP_NO_CHANGE, 0);
   net::IPEndPoint dest4 = ParseAddress(kTestIpAddress1, 2224);
   // This packet should also be dropped.
   socket_host_->Send(dest4, packet1, net::DSCP_NO_CHANGE, 0);
   // |dest1| is known, we can send as many packets to it.
   socket_host_->Send(dest1_, packet1, net::DSCP_NO_CHANGE, 0);
   ASSERT_EQ(sent_packets_.size(), 4U);
 }
 
 }  // namespace content