To mitigate the effects of hanging 0-RTT QUIC connections,

net/quic/quic_client_session.h

 // 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.
 //
 // A client specific QuicSession subclass.  This class owns the underlying
 // QuicConnection and QuicConnectionHelper objects.  The connection stores
 // a non-owning pointer to the helper so this session needs to ensure that
 // the helper outlives the connection.
 
 #ifndef NET_QUIC_QUIC_CLIENT_SESSION_H_
@@ skipping 81 matching lines @@
   QuicClientSession(QuicConnection* connection,
                     scoped_ptr<DatagramClientSocket> socket,
                     scoped_ptr<QuicDefaultPacketWriter> writer,
                     QuicStreamFactory* stream_factory,
                     QuicCryptoClientStreamFactory* crypto_client_stream_factory,
                     scoped_ptr<QuicServerInfo> server_info,
                     const QuicServerId& server_id,
                     const QuicConfig& config,
                     uint32 max_flow_control_receive_window_bytes,
                     QuicCryptoClientConfig* crypto_config,
+                    base::TaskRunner* task_runner,
                     NetLog* net_log);
 
   virtual ~QuicClientSession();
 
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
   // Attempts to create a new stream.  If the stream can be
   // created immediately, returns OK.  If the open stream limit
   // has been reached, returns ERR_IO_PENDING, and |request|
@@ skipping 31 matching lines @@
 
   // QuicConnectionVisitorInterface methods:
   virtual void OnConnectionClosed(QuicErrorCode error, bool from_peer) OVERRIDE;
   virtual void OnSuccessfulVersionNegotiation(
       const QuicVersion& version) OVERRIDE;
 
   // Performs a crypto handshake with the server.
   int CryptoConnect(bool require_confirmation,
                     const CompletionCallback& callback);
 
+  // Resumes a crypto handshake with the server after a timeout.
+  int ResumeCryptoConnect(const CompletionCallback& callback);
+
   // Causes the QuicConnectionHelper to start reading from the socket
   // and passing the data along to the QuicConnection.
   void StartReading();
 
   // Close the session because of |error| and notifies the factory
   // that this session has been closed, which will delete the session.
   void CloseSessionOnError(int error);
 
   base::Value* GetInfoAsValue(const std::set<HostPortPair>& aliases);
 
@@ skipping 44 matching lines @@
   // streams, because closing a stream may cause a new stream to be created.
   void NotifyFactoryOfSessionGoingAway();
 
   // Posts a task to notify the factory that this session has been closed.
   void NotifyFactoryOfSessionClosedLater();
 
   // Notifies the factory that this session has been closed which will
   // delete |this|.
   void NotifyFactoryOfSessionClosed();
 
+  void OnConnectTimeout();
+
   bool require_confirmation_;
   scoped_ptr<QuicCryptoClientStream> crypto_stream_;
   QuicStreamFactory* stream_factory_;
   scoped_ptr<DatagramClientSocket> socket_;
   scoped_ptr<QuicDefaultPacketWriter> writer_;
   scoped_refptr<IOBufferWithSize> read_buffer_;
   scoped_ptr<QuicServerInfo> server_info_;
   scoped_ptr<CertVerifyResult> cert_verify_result_;
   ObserverSet observers_;
   StreamRequestQueue stream_requests_;
   bool read_pending_;
   CompletionCallback callback_;
   size_t num_total_streams_;
+  base::TaskRunner* task_runner_;
   BoundNetLog net_log_;
   QuicConnectionLogger logger_;
   // Number of packets read in the current read loop.
   size_t num_packets_read_;
   // True when the session is going away, and streams may no longer be created
   // on this session. Existing stream will continue to be processed.
   bool going_away_;
   base::WeakPtrFactory<QuicClientSession> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicClientSession);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_CLIENT_SESSION_H_