Repair the CWND reduction caused by spurious RTO's in QUIC's congestion

net/quic/quic_connection_stats.h

 // Copyright 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.
 
 #ifndef NET_QUIC_QUIC_CONNECTION_STATS_H_
 #define NET_QUIC_QUIC_CONNECTION_STATS_H_
 
 #include <ostream>
 
 #include "base/basictypes.h"
@@ skipping 31 matching lines @@
   uint32 slowstart_packets_lost;  // Number of packets lost exiting slow start.
 
   uint32 packets_revived;
   uint32 packets_dropped;  // Duplicate or less than least unacked.
   uint32 crypto_retransmit_count;
   // Count of times the loss detection alarm fired.  At least one packet should
   // be lost when the alarm fires.
   uint32 loss_timeout_count;
   uint32 tlp_count;
   uint32 rto_count;  // Count of times the rto timer fired.
+  uint32 spurious_rto_count;
 
   uint32 min_rtt_us;  // Minimum RTT in microseconds.
   uint32 srtt_us;  // Smoothed RTT in microseconds.
   uint32 max_packet_size;  // In bytes.
   uint64 estimated_bandwidth;  // In bytes per second.
   uint32 congestion_window;  // In bytes
 
   // Reordering stats for received packets.
   // Number of packets received out of sequence number order.
   uint32 packets_reordered;
@@ skipping 11 matching lines @@
   // Total amount of cwnd increase by TCPCubic in cubic mode.
   uint32 cwnd_increase_cubic_mode;
 
   // Creation time, as reported by the QuicClock.
   QuicTime connection_creation_time;
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_CONNECTION_STATS_H_