Simplify RTO interaction between the QUIC sent packet manager and the

net/quic/congestion_control/inter_arrival_sender.cc

 // Copyright (c) 2013 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/inter_arrival_sender.h"
 
 namespace net {
 
 namespace {
 const int64 kProbeBitrateKBytesPerSecond = 1200;  // 9.6 Mbit/s
@@ skipping 243 matching lines @@
     QuicByteCount bytes,
     TransmissionType /*transmission_type*/,
     HasRetransmittableData /*has_retransmittable_data*/) {
   if (probing_) {
     probe_->OnPacketSent(bytes);
   }
   paced_sender_->OnPacketSent(sent_time, bytes);
   return true;
 }
 
-void InterArrivalSender::OnRetransmissionTimeout() {
+void InterArrivalSender::OnRetransmissionTimeout(
+    bool /*packets_retransmitted*/) {
   // TODO(ianswett): Decrease the available bandwidth.
+  if (probing_) {
+    probe_->OnRetransmissionTimeout();
+  }
 }
 
 void InterArrivalSender::OnPacketAbandoned(
     QuicPacketSequenceNumber /*sequence_number*/,
     QuicByteCount abandoned_bytes) {
   // TODO(pwestin): use for out outer_congestion_window_ logic.
   if (probing_) {
     probe_->OnAcknowledgedPacket(abandoned_bytes);
   }
 }
@@ skipping 244 matching lines @@
   bitrate_ramp_up_->Reset(new_rate, current_bandwidth_, channel_estimate);
   if (new_rate != current_bandwidth_) {
     current_bandwidth_ = new_rate;
     paced_sender_->UpdateBandwidthEstimate(feedback_receive_time,
                                            current_bandwidth_);
     state_machine_->DecreaseBitrateDecision();
   }
 }
 
 }  // namespace net