Populate slowstart numbers in stats.

net/quic/congestion_control/tcp_cubic_bytes_sender.cc

 // Copyright (c) 2015 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_bytes_sender.h"
 
 #include <algorithm>
 
 #include "net/quic/congestion_control/prr_sender.h"
 #include "net/quic/congestion_control/rtt_stats.h"
@@ skipping 187 matching lines @@
   DVLOG(1) << "Incoming loss; congestion window: " << congestion_window_
            << " slowstart threshold: " << slowstart_threshold_;
 }
 
 bool TcpCubicBytesSender::OnPacketSent(
     QuicTime /*sent_time*/,
     QuicByteCount /*bytes_in_flight*/,
     QuicPacketSequenceNumber sequence_number,
     QuicByteCount bytes,
     HasRetransmittableData is_retransmittable) {
+  if (InSlowStart()) {
+    ++(stats_->slowstart_packets_sent);
+  }
+
   // Only update bytes_in_flight_ for data packets.
   if (is_retransmittable != HAS_RETRANSMITTABLE_DATA) {
     return false;
   }
   if (InRecovery()) {
     // PRR is used when in recovery.
     prr_.OnPacketSent(bytes);
   }
   DCHECK_LT(largest_sent_sequence_number_, sequence_number);
   largest_sent_sequence_number_ = sequence_number;
@@ skipping 137 matching lines @@
   hybrid_slow_start_.Restart();
   slowstart_threshold_ = congestion_window_ / 2;
   congestion_window_ = min_congestion_window_;
 }
 
 CongestionControlType TcpCubicBytesSender::GetCongestionControlType() const {
   return reno_ ? kRenoBytes : kCubicBytes;
 }
 
 }  // namespace net