Add experimental option for TCP FastOpen....

net/socket/client_socket.h

 // Copyright (c) 2010 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_CLIENT_SOCKET_H_
 #define NET_SOCKET_CLIENT_SOCKET_H_
 #pragma once
 
 #include "net/base/net_log.h"
 #include "net/socket/socket.h"
@@ skipping 51 matching lines @@
   // reasons.  This call is generally forwarded to a basic TCPClientSocket*,
   // where a UseHistory can be updated.
   virtual void SetSubresourceSpeculation() = 0;
   virtual void SetOmniboxSpeculation() = 0;
 
   // Returns true if the underlying transport socket ever had any reads or
   // writes.  ClientSockets layered on top of transport sockets should forward
   // this call to the transport socket.
   virtual bool WasEverUsed() const = 0;
 
+  // Returns true if the underlying transport socket is using TCP FastOpen.
+  // TCP FastOpen is an experiment with sending data in the TCP SYN packet.
+  virtual bool UsingTCPFastOpen() const = 0;
+
  protected:
   // The following class is only used to gather statistics about the history of
   // a socket.  It is only instantiated and used in basic sockets, such as
   // TCPClientSocket* instances.  Other classes that are derived from
   // ClientSocket should forward any potential settings to their underlying
   // transport sockets.
   class UseHistory {
    public:
     UseHistory();
     ~UseHistory();
@@ skipping 28 matching lines @@
   // Logs a SOCKET_BYTES_RECEIVED or SOCKET_BYTES_SENT event to the NetLog.
   // Determines whether to log the received bytes or not, based on the current
   // logging level.
   void LogByteTransfer(const BoundNetLog& net_log, NetLog::EventType event_type,
                        int byte_count, char* bytes) const;
 };
 
 }  // namespace net
 
 #endif  // NET_SOCKET_CLIENT_SOCKET_H_