relnote: Add a new LazyFack loss detection to QUIC triggered by the LFAK connection option.

net/quic/core/quic_protocol.h

 // Copyright (c) 2012 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_PROTOCOL_H_
 #define NET_QUIC_QUIC_PROTOCOL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 1042 matching lines @@
   kCubicBytes,
   kReno,
   kRenoBytes,
   kBBR,
 };
 
 enum LossDetectionType {
   kNack,          // Used to mimic TCP's loss detection.
   kTime,          // Time based loss detection.
   kAdaptiveTime,  // Adaptive time based loss detection.
+  kLazyFack,      // Nack based but with FACK disabled for the first ack.
 };
 
 struct NET_EXPORT_PRIVATE QuicRstStreamFrame {
   QuicRstStreamFrame();
   QuicRstStreamFrame(QuicStreamId stream_id,
                      QuicRstStreamErrorCode error_code,
                      QuicStreamOffset bytes_written);
 
   NET_EXPORT_PRIVATE friend std::ostream& operator<<(
       std::ostream& os,
@@ skipping 457 matching lines @@
       : iov(iov), iov_count(iov_count), total_length(total_length) {}
 
   const struct iovec* iov;
   const int iov_count;
   const size_t total_length;
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_PROTOCOL_H_