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

net/quic/congestion_control/loss_detection_interface.h

 // Copyright 2014 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.
 //
 // The pure virtual class for send side loss detection algorithm.
 
 #ifndef NET_QUIC_CONGESTION_CONTROL_LOSS_DETECTION_INTERFACE_H_
 #define NET_QUIC_CONGESTION_CONTROL_LOSS_DETECTION_INTERFACE_H_
 
 #include "base/basictypes.h"
 #include "net/quic/quic_protocol.h"
 #include "net/quic/quic_time.h"
 
 namespace net {
 
 class QuicUnackedPacketMap;
+class RttStats;
 
 class NET_EXPORT_PRIVATE LossDetectionInterface {
  public:
   // Creates a TCP loss detector.
   static LossDetectionInterface* Create();
 
   virtual ~LossDetectionInterface() {}
 
   // Called when a new ack arrives or the loss alarm fires.
   virtual SequenceNumberSet DetectLostPackets(
       const QuicUnackedPacketMap& unacked_packets,
       const QuicTime& time,
       QuicPacketSequenceNumber largest_observed,
-      QuicTime::Delta srtt,
-      QuicTime::Delta latest_rtt) = 0;
+      const RttStats& rtt_stats) = 0;
 
   // Get the time the LossDetectionAlgorithm wants to re-evaluate losses.
   // Returns QuicTime::Zero if no alarm needs to be set.
   virtual QuicTime GetLossTimeout() const = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CONGESTION_CONTROL_LOSS_DETECTION_INTERFACE_H_