Gather histogram for received packets indicating losses.

net/quic/quic_connection_logger.h

 // 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.
 
 #ifndef NET_QUIC_QUIC_CONNECTION_LOGGER_H_
 #define NET_QUIC_QUIC_CONNECTION_LOGGER_H_
 
+#include <vector>
+
 #include "net/base/ip_endpoint.h"
 #include "net/quic/quic_connection.h"
 #include "net/quic/quic_protocol.h"
 
 namespace net {
 
 class CryptoHandshakeMessage;
 
 // This class is a debug visitor of a QuicConnection which logs
 // events to |net_log|.
@@ skipping 53 matching lines @@
   QuicPacketSequenceNumber largest_received_missing_packet_sequence_number_;
   // Number of times that the current received packet sequence number is
   // smaller than the last received packet sequence number.
   size_t out_of_order_recieved_packet_count_;
   // Number of times a truncated ACK frame was sent.
   size_t num_truncated_acks_sent_;
   // Number of times a truncated ACK frame was received.
   size_t num_truncated_acks_received_;
   // The kCADR value provided by the server in ServerHello.
   IPEndPoint client_address_;
+  // Vector of inital packets status', where false means never received.
+  std::vector<bool> packets_received_;

[Ryan Hamilton, 2014/03/05 03:48:00]

You could also consider using a std::bitset, if you'd like, since it's optimized
to hold single bits.

[jar (doing other things), 2014/03/06 03:34:17]

Done.

   DISALLOW_COPY_AND_ASSIGN(QuicConnectionLogger);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_CONNECTION_LOGGER_H_