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

net/quic/quic_chromium_client_session.h

Index: net/quic/quic_chromium_client_session.h
diff --git a/net/quic/quic_chromium_client_session.h b/net/quic/quic_chromium_client_session.h
index 0a1ac868ce0f13b24d74e055834c497bb9727472..38ce10746f54169dc25443e74784db0eb5c360de 100644
--- a/net/quic/quic_chromium_client_session.h
+++ b/net/quic/quic_chromium_client_session.h
@@ -184,7 +184,7 @@ class NET_EXPORT_PRIVATE QuicChromiumClientSession
   // Resumes a crypto handshake with the server after a timeout.
   int ResumeCryptoConnect(const CompletionCallback& callback);
 
-  // Causes the QuicConnectionHelper to start reading from the socket
+  // Causes the QuicConnectionHelper to start reading from all sockets
   // and passing the data along to the QuicConnection.
   void StartReading();
 
@@ -217,6 +217,13 @@ class NET_EXPORT_PRIVATE QuicChromiumClientSession
 
   QuicDisabledReason disabled_reason() const { return disabled_reason_; }
 
+  // Call to add a new socket to the session. Takes ownership of |socket|.
+  void AddSocket(scoped_ptr<DatagramClientSocket> socket);
+
+  // Call to add a new PacketReader to the session. Returns true if reader was
+  // successfully added to the session. Takes ownership of |reader|.
+  bool AddPacketReader(QuicPacketReader* reader);
+
  protected:
   // QuicSession methods:
   QuicDataStream* CreateIncomingDynamicStream(QuicStreamId id) override;
@@ -266,7 +273,7 @@ class NET_EXPORT_PRIVATE QuicChromiumClientSession
   bool require_confirmation_;
   scoped_ptr<QuicCryptoClientStream> crypto_stream_;
   QuicStreamFactory* stream_factory_;
-  scoped_ptr<DatagramClientSocket> socket_;
+  std::vector<scoped_ptr<DatagramClientSocket>> sockets_;
   TransportSecurityState* transport_security_state_;
   scoped_ptr<QuicServerInfo> server_info_;
   scoped_ptr<CertVerifyResult> cert_verify_result_;
@@ -277,7 +284,7 @@ class NET_EXPORT_PRIVATE QuicChromiumClientSession
   size_t num_total_streams_;
   base::TaskRunner* task_runner_;
   BoundNetLog net_log_;
-  QuicPacketReader packet_reader_;
+  std::vector<scoped_ptr<QuicPacketReader>> packet_readers_;
   base::TimeTicks dns_resolution_end_time_;
   base::TimeTicks handshake_start_;  // Time the handshake was started.
   scoped_ptr<QuicConnectionLogger> logger_;