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

net/quic/congestion_control/send_algorithm_interface.cc

 // 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.
 
 #include "net/quic/congestion_control/send_algorithm_interface.h"
 
 #include "net/quic/congestion_control/fix_rate_sender.h"
 #include "net/quic/congestion_control/inter_arrival_sender.h"
 #include "net/quic/congestion_control/tcp_cubic_sender.h"
 #include "net/quic/quic_protocol.h"
 
 namespace net {
 
 const bool kUseReno = false;
 
+class RttStats;
+
 // Factory for send side congestion control algorithm.
 SendAlgorithmInterface* SendAlgorithmInterface::Create(
     const QuicClock* clock,
+    const RttStats* rtt_stats,
     CongestionFeedbackType type,
     QuicConnectionStats* stats) {
   switch (type) {
     case kTCP:
-      return new TcpCubicSender(clock, kUseReno, kMaxTcpCongestionWindow,
-                                stats);
+      return new TcpCubicSender(clock, rtt_stats, kUseReno,
+                                kMaxTcpCongestionWindow, stats);
     case kInterArrival:
-      return new InterArrivalSender(clock);
+      return new InterArrivalSender(clock, rtt_stats);
     case kFixRate:
       return new FixRateSender(clock);
   }
   return NULL;
 }
 
 }  // namespace net