Notify NQE of TCP RTT values

net/socket/tcp_socket_posix.h

 // Copyright 2013 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_TCP_SOCKET_POSIX_H_
 #define NET_SOCKET_TCP_SOCKET_POSIX_H_
 
 #include <stdint.h>
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "net/base/address_family.h"
 #include "net/base/completion_callback.h"
 #include "net/base/net_export.h"
+#include "net/base/socket_performance_watcher.h"

[bengr, 2016/02/08 18:51:14]

Can this be a forward declaration?

[tbansal1, 2016/02/08 21:33:26]

No, that gives compiler error:
gnu/4.6/../../../../include/c++/4.6/bits/unique_ptr.h:61:16: error: invalid
application of 'sizeof' to an incomplete type 'net::SocketPerformanceWatcher'

[bengr, 2016/02/08 23:42:06]

Acknowledged.

 #include "net/log/net_log.h"
 
 namespace net {
 
 class AddressList;
 class IOBuffer;
 class IPEndPoint;
 class SocketPosix;
 
 class NET_EXPORT TCPSocketPosix {
  public:
-  TCPSocketPosix(NetLog* net_log, const NetLog::Source& source);
+  TCPSocketPosix(
+      scoped_ptr<SocketPerformanceWatcher> socket_performance_watcher,
+      NetLog* net_log,
+      const NetLog::Source& source);
   virtual ~TCPSocketPosix();
 
   int Open(AddressFamily family);
   // Takes ownership of |socket_fd|.
   int AdoptConnectedSocket(int socket_fd, const IPEndPoint& peer_address);
 
   int Bind(const IPEndPoint& address);
 
   int Listen(int backlog);
   int Accept(scoped_ptr<TCPSocketPosix>* socket,
@@ skipping 150 matching lines @@
   int HandleReadCompleted(IOBuffer* buf, int rv);
 
   void WriteCompleted(const scoped_refptr<IOBuffer>& buf,
                       const CompletionCallback& callback,
                       int rv);
   int HandleWriteCompleted(IOBuffer* buf, int rv);
   int TcpFastOpenWrite(IOBuffer* buf,
                        int buf_len,
                        const CompletionCallback& callback);
 
+  // Notifies |socket_performance_watcher_| of the latest RTT estimate available
+  // from the tcp_info struct for this TCP socket.
+  void NotifySocketPerformanceWatcher() const;
+
   // Called after the first read completes on a TCP FastOpen socket.
   void UpdateTCPFastOpenStatusAfterRead();
 
   scoped_ptr<SocketPosix> socket_;
   scoped_ptr<SocketPosix> accept_socket_;
 
+  // Socket performance statistics (such as RTT) are reported to the
+  // |socket_performance_watcher_|. May be nullptr.
+  scoped_ptr<SocketPerformanceWatcher> socket_performance_watcher_;
+
   // Enables experimental TCP FastOpen option.
   bool use_tcp_fastopen_;
 
   // True when TCP FastOpen is in use and we have attempted the
   // connect with write.
   bool tcp_fastopen_write_attempted_;
 
   // True when TCP FastOpen is in use and we have done the connect.
   bool tcp_fastopen_connected_;
 
   TCPFastOpenStatus tcp_fastopen_status_;
 
   bool logging_multiple_connect_attempts_;
 
   BoundNetLog net_log_;
 
   DISALLOW_COPY_AND_ASSIGN(TCPSocketPosix);
 };
 
 }  // namespace net
 
 #endif  // NET_SOCKET_TCP_SOCKET_POSIX_H_