Use overloaded operators with QuicTime for addition, subtraction and scalar

net/quic/congestion_control/tcp_cubic_sender_base.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_packets.h"
 
 #include <algorithm>
 
 #include "base/metrics/histogram_macros.h"
 #include "net/quic/congestion_control/prr_sender.h"
@@ skipping 225 matching lines @@
     // If we haven't measured an rtt, the bandwidth estimate is unknown.
     return QuicBandwidth::Zero();
   }
   return QuicBandwidth::FromBytesAndTimeDelta(GetCongestionWindow(), srtt);
 }
 
 QuicTime::Delta TcpCubicSenderBase::RetransmissionDelay() const {
   if (rtt_stats_->smoothed_rtt().IsZero()) {
     return QuicTime::Delta::Zero();
   }
-  return rtt_stats_->smoothed_rtt().Add(
-      rtt_stats_->mean_deviation().Multiply(4));
+  return rtt_stats_->smoothed_rtt() + 4 * rtt_stats_->mean_deviation();
 }
 
 bool TcpCubicSenderBase::InSlowStart() const {
   return GetCongestionWindow() < GetSlowStartThreshold();
 }
 
 bool TcpCubicSenderBase::IsCwndLimited(QuicByteCount bytes_in_flight) const {
   const QuicByteCount congestion_window = GetCongestionWindow();
   if (bytes_in_flight >= congestion_window) {
     return true;
@@ skipping 21 matching lines @@
 void TcpCubicSenderBase::OnConnectionMigration() {
   hybrid_slow_start_.Restart();
   prr_ = PrrSender();
   largest_sent_packet_number_ = 0;
   largest_acked_packet_number_ = 0;
   largest_sent_at_last_cutback_ = 0;
   last_cutback_exited_slowstart_ = false;
 }
 
 }  // namespace net