Refactor of QUIC's rtt storage and calculation to have a single RttStats

net/quic/quic_sent_packet_manager.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_QUIC_QUIC_SENT_PACKET_MANAGER_H_
 #define NET_QUIC_QUIC_SENT_PACKET_MANAGER_H_
 
 #include <deque>
 #include <list>
 #include <map>
 #include <queue>
 #include <set>
 #include <utility>
 #include <vector>
 
 #include "base/containers/hash_tables.h"
 #include "base/memory/scoped_ptr.h"
 #include "net/base/linked_hash_map.h"
 #include "net/quic/congestion_control/loss_detection_interface.h"
+#include "net/quic/congestion_control/rtt_stats.h"
 #include "net/quic/congestion_control/send_algorithm_interface.h"
 #include "net/quic/quic_ack_notifier_manager.h"
 #include "net/quic/quic_protocol.h"
 #include "net/quic/quic_unacked_packet_map.h"
 
 NET_EXPORT_PRIVATE extern bool FLAGS_track_retransmission_history;
 NET_EXPORT_PRIVATE extern bool FLAGS_enable_quic_pacing;
 
 namespace net {
 
@@ skipping 232 matching lines @@
   // Tracks if the connection was created by the server.
   bool is_server_;
 
   // An AckNotifier can register to be informed when ACKs have been received for
   // all packets that a given block of data was sent in. The AckNotifierManager
   // maintains the currently active notifiers.
   AckNotifierManager ack_notifier_manager_;
 
   const QuicClock* clock_;
   QuicConnectionStats* stats_;
+  RttStats rtt_stats_;
   scoped_ptr<SendAlgorithmInterface> send_algorithm_;
   scoped_ptr<LossDetectionInterface> loss_algorithm_;
-  QuicTime::Delta rtt_sample_;  // RTT estimate from the most recent ACK.
+
   QuicPacketSequenceNumber largest_observed_;  // From the most recent ACK.
   // Number of times the RTO timer has fired in a row without receiving an ack.
   size_t consecutive_rto_count_;
   // Number of times the tail loss probe has been sent.
   size_t consecutive_tlp_count_;
   // Number of times the crypto handshake has been retransmitted.
   size_t consecutive_crypto_retransmission_count_;
   // Maximum number of tail loss probes to send before firing an RTO.
   size_t max_tail_loss_probes_;
   bool using_pacing_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicSentPacketManager);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_SENT_PACKET_MANAGER_H_