Bind a socket to a network if the network handle is set.

webrtc/p2p/base/packetsocketfactory.h

 /*
  *  Copyright 2011 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.
  */
 
 #ifndef WEBRTC_P2P_BASE_PACKETSOCKETFACTORY_H_
 #define WEBRTC_P2P_BASE_PACKETSOCKETFACTORY_H_
 
+#include "webrtc/base/common.h"
 #include "webrtc/base/proxyinfo.h"
 
 namespace rtc {
 
 class AsyncPacketSocket;
 class AsyncResolverInterface;
+class Network;
 
 class PacketSocketFactory {
  public:
   enum Options {
     OPT_SSLTCP = 0x01,  // Pseudo-TLS.
     OPT_TLS = 0x02,
     OPT_STUN = 0x04,
   };
 
   PacketSocketFactory() { }
   virtual ~PacketSocketFactory() { }
 
   virtual AsyncPacketSocket* CreateUdpSocket(const SocketAddress& address,
                                              uint16_t min_port,
                                              uint16_t max_port) = 0;
+  // TODO(honghaiz): Make this pure virtual method when all subclasses in
+  // Chrome define this.
+  virtual AsyncPacketSocket* CreateUdpSocketOnNetwork(
+      const SocketAddress& address,
+      uint16_t min_port,
+      uint16_t max_port,
+      const Network* network) {
+    // Should not have reached here.
+    ASSERT(false);
+    return nullptr;
+  }
+
   virtual AsyncPacketSocket* CreateServerTcpSocket(
       const SocketAddress& local_address,
       uint16_t min_port,
       uint16_t max_port,
       int opts) = 0;
 
   // TODO: |proxy_info| and |user_agent| should be set
   // per-factory and not when socket is created.
   virtual AsyncPacketSocket* CreateClientTcpSocket(
       const SocketAddress& local_address,
       const SocketAddress& remote_address,
       const ProxyInfo& proxy_info,
       const std::string& user_agent,
       int opts) = 0;
 
   virtual AsyncResolverInterface* CreateAsyncResolver() = 0;
 
  private:
   RTC_DISALLOW_COPY_AND_ASSIGN(PacketSocketFactory);
 };
 
 }  // namespace rtc
 
 #endif  // WEBRTC_P2P_BASE_PACKETSOCKETFACTORY_H_