Change the default RTT from 60ms to 100ms, which is more typical of

net/quic/congestion_control/tcp_cubic_sender.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/tcp_cubic_sender.h"
 
 #include <algorithm>
 
 #include "base/metrics/histogram.h"
 
 using std::max;
 using std::min;
 
 namespace net {
 
 namespace {
 // Constants based on TCP defaults.
 // The minimum cwnd based on RFC 3782 (TCP NewReno) for cwnd reductions on a
 // fast retransmission.  The cwnd after a timeout is still 1.
 const QuicTcpCongestionWindow kMinimumCongestionWindow = 2;
 const int64 kHybridStartLowWindow = 16;
 const QuicByteCount kMaxSegmentSize = kDefaultTCPMSS;
 const QuicByteCount kDefaultReceiveWindow = 64000;
 const int64 kInitialCongestionWindow = 10;
 const int kMaxBurstLength = 3;
 // Constants used for RTT calculation.
-const int kInitialRttMs = 60;  // At a typical RTT 60 ms.
+const int kInitialRttMs = 100;  // At a typical RTT 100 ms.
 const float kAlpha = 0.125f;
 const float kOneMinusAlpha = (1 - kAlpha);
 const float kBeta = 0.25f;
 const float kOneMinusBeta = (1 - kBeta);
 };  // namespace
 
 TcpCubicSender::TcpCubicSender(
     const QuicClock* clock,
     bool reno,
     QuicTcpCongestionWindow max_tcp_congestion_window)
@@ skipping 331 matching lines @@
       hybrid_slow_start_.Reset(end_sequence_number_);
     }
     hybrid_slow_start_.Update(rtt, delay_min_);
     if (hybrid_slow_start_.Exit()) {
       slowstart_threshold_ = congestion_window_;
     }
   }
 }
 
 }  // namespace net