Migrates QUIC sessions to a new network when old network is (about to be) disconnected.

net/udp/datagram_client_socket.h

 // Copyright (c) 2011 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_CLIENT_SOCKET_H_
 #define NET_UDP_DATAGRAM_CLIENT_SOCKET_H_
 
 #include "net/base/network_change_notifier.h"
 #include "net/socket/socket.h"
 #include "net/udp/datagram_socket.h"
 
 namespace net {
 
 class IPEndPoint;
 
 class NET_EXPORT_PRIVATE DatagramClientSocket : public DatagramSocket,
                                                 public Socket {
  public:
   ~DatagramClientSocket() override {}
 
   // Binds this socket to |network|. All data traffic on the socket will be sent
   // and received via |network|. Must be called before Connect(). This call will
   // fail if |network| has disconnected. Communication using this socket will
   // fail if |network| disconnects.
   // Returns a net error code.
   virtual int BindToNetwork(NetworkChangeNotifier::NetworkHandle network) = 0;
 
+  // Same as BindToNetwork, except that the current default network is used.
+  // Returns a net error code.
+  virtual int BindToDefaultNetwork() = 0;
+
   // Initialize this socket as a client socket to server at |address|.
   // Returns a network error code.
   virtual int Connect(const IPEndPoint& address) = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_UDP_DATAGRAM_CLIENT_SOCKET_H_