QUIC - disable QUIC if packet loss rate is bad for a connection.

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 <bitset>
 
 #include "net/base/ip_endpoint.h"
@@ skipping 59 matching lines @@
 
   void OnCryptoHandshakeMessageReceived(
       const CryptoHandshakeMessage& message);
   void OnCryptoHandshakeMessageSent(
       const CryptoHandshakeMessage& message);
   void UpdateReceivedFrameCounts(QuicStreamId stream_id,
                                  int num_frames_received,
                                  int num_duplicate_frames_received);
   void OnCertificateVerified(const CertVerifyResult& result);
 
+  // Return connection's overall packet loss rate in 1/10th of percent.

[Ryan Hamilton, 2015/03/23 02:31:06]

Since it's a float, I wonder if this should simply be a percent? Or possibly a
fraction?

[ramant (doing other things), 2015/03/24 03:07:22]

Changed it to return a fraction.

Done.

+  float PacketLossRate() const;
+
  private:
   friend class test::QuicConnectionLoggerPeer;
 
   // Do a factory get for a histogram for recording data, about individual
   // packet sequence numbers, that was gathered in the vectors
   // received_packets_ and received_acks_. |statistic_name| identifies which
   // element of data is recorded, and is used to form the histogram name.
   base::HistogramBase* GetPacketSequenceNumberHistogram(
       const char* statistic_name) const;
   // Do a factory get for a histogram to record a 6-packet loss-sequence as a
@@ skipping 83 matching lines @@
   // The available type of connection (WiFi, 3G, etc.) when connection was first
   // used.
   const char* const connection_description_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicConnectionLogger);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_CONNECTION_LOGGER_H_