Fix RttStats windowing so if no recent min rtt window is specified,

net/quic/congestion_control/rtt_stats.cc

 // 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.
 
 #include "net/quic/congestion_control/rtt_stats.h"
 
 namespace net {
 
 namespace {
 
 // Default initial rtt used before any samples are received.
 const int kInitialRttMs = 100;
 const float kAlpha = 0.125f;
 const float kOneMinusAlpha = (1 - kAlpha);
 const float kBeta = 0.25f;
 const float kOneMinusBeta = (1 - kBeta);
 const float kHalfWindow = 0.5f;
 const float kQuarterWindow = 0.25f;
 
 }  // namespace
 
 RttStats::RttStats()
     : latest_rtt_(QuicTime::Delta::Zero()),
       min_rtt_(QuicTime::Delta::Zero()),
       smoothed_rtt_(QuicTime::Delta::Zero()),
       mean_deviation_(QuicTime::Delta::Zero()),
       initial_rtt_us_(kInitialRttMs * base::Time::kMicrosecondsPerMillisecond),
       num_min_rtt_samples_remaining_(0),
-      recent_min_rtt_window_(QuicTime::Delta::Zero()) { }
+      recent_min_rtt_window_(QuicTime::Delta::Infinite()) {}
 
 bool RttStats::HasUpdates() const {
   return !smoothed_rtt_.IsZero();
 }
 
 void RttStats::SampleNewRecentMinRtt(uint32 num_samples) {
   num_min_rtt_samples_remaining_ = num_samples;
   new_min_rtt_ = RttSample();
 }
 
@@ skipping 80 matching lines @@
 }
 
 QuicTime::Delta RttStats::SmoothedRtt() const {
   if (!HasUpdates()) {
     return QuicTime::Delta::FromMicroseconds(initial_rtt_us_);
   }
   return smoothed_rtt_;
 }
 
 }  // namespace net