Land Recent QUIC changes.

net/quic/congestion_control/hybrid_slow_start.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/hybrid_slow_start.h"
 
 namespace net {
 
 // Note(pwestin): the magic clamping numbers come from the original code in
 // tcp_cubic.c.
@@ skipping 23 matching lines @@
 void HybridSlowStart::Reset(QuicPacketSequenceNumber end_sequence_number) {
   DLOG(INFO) << "Reset hybrid slow start @" << end_sequence_number;
   round_start_ = last_time_ = clock_->ApproximateNow();
   end_sequence_number_ = end_sequence_number;
   current_rtt_ = QuicTime::Delta::Zero();
   sample_count_ = 0;
   started_ = true;
 }
 
 bool HybridSlowStart::EndOfRound(QuicPacketSequenceNumber ack) {
-  // TODO(pwestin): do we need to handle wraparound?
   return end_sequence_number_ <= ack;
 }
 
 void HybridSlowStart::Update(QuicTime::Delta rtt, QuicTime::Delta delay_min) {
   // The original code doesn't invoke this until we hit 16 packet per burst.
   // Since the code handles lower than 16 grecefully and I removed that
   // limit.
   if (found_ack_train_ || found_delay_) {
     return;
   }
@@ skipping 49 matching lines @@
   }
   return false;
 }
 
 QuicTime::Delta HybridSlowStart::SmoothedRtt() {
   // TODO(satyamshekhar): Calculate and return smooth average of rtt over time.
   return current_rtt_;
 }
 
 }  // namespace net