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

net/udp/udp_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_SOCKET_UDP_CLIENT_SOCKET_H_
 #define NET_SOCKET_UDP_CLIENT_SOCKET_H_
 
 #include "net/base/rand_callback.h"
 #include "net/log/net_log.h"
 #include "net/udp/datagram_client_socket.h"
 #include "net/udp/udp_socket.h"
 
 namespace net {
 
 class BoundNetLog;
 
 // A client socket that uses UDP as the transport layer.
 class NET_EXPORT_PRIVATE UDPClientSocket : public DatagramClientSocket {
  public:
   UDPClientSocket(DatagramSocket::BindType bind_type,
                   const RandIntCallback& rand_int_cb,
                   net::NetLog* net_log,
                   const net::NetLog::Source& source);
   ~UDPClientSocket() override;
 
   // DatagramClientSocket implementation.
   int BindToNetwork(NetworkChangeNotifier::NetworkHandle network) override;
+  int BindToDefaultNetwork() override;
   int Connect(const IPEndPoint& address) override;
   int Read(IOBuffer* buf,
            int buf_len,
            const CompletionCallback& callback) override;
   int Write(IOBuffer* buf,
             int buf_len,
             const CompletionCallback& callback) override;
   void Close() override;
   int GetPeerAddress(IPEndPoint* address) const override;
   int GetLocalAddress(IPEndPoint* address) const override;
   int SetReceiveBufferSize(int32 size) override;
   int SetSendBufferSize(int32 size) override;
   const BoundNetLog& NetLog() const override;
 
 #if defined(OS_WIN)
   // Switch to use non-blocking IO. Must be called right after construction and
   // before other calls.
   void UseNonBlockingIO();
 #endif
 
  private:
   UDPSocket socket_;
   DISALLOW_COPY_AND_ASSIGN(UDPClientSocket);
 };
 
 }  // namespace net
 
 #endif  // NET_SOCKET_UDP_CLIENT_SOCKET_H_