Land Recent QUIC changes.

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"
 
 namespace net {
 
 namespace {
 // Constants based on TCP defaults.
@@ skipping 210 matching lines @@
   }
   // Hybrid start triggers when cwnd is larger than some threshold.
   if (congestion_window_ <= slowstart_threshold_ &&
       congestion_window_ >= kHybridStartLowWindow) {
     if (!hybrid_slow_start_.started()) {
       // Time to start the hybrid slow start.
       hybrid_slow_start_.Reset(end_sequence_number_);
     }
     hybrid_slow_start_.Update(rtt, delay_min_);
     if (hybrid_slow_start_.Exit()) {
+      DLOG(INFO) << "Set slowstart threshold:" << congestion_window_;
       slowstart_threshold_ = congestion_window_;
     }
   }
 }
 
 }  // namespace net