Add a new QUIC Ack Decimation mode that is reordering tolerant. Protected by FLAG_quic_ack_decimati…

net/quic/crypto/crypto_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_CRYPTO_CRYPTO_PROTOCOL_H_
 #define NET_QUIC_CRYPTO_CRYPTO_PROTOCOL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 71 matching lines @@
 const QuicTag kNTLP = TAG('N', 'T', 'L', 'P');   // No tail loss probe
 const QuicTag kNCON = TAG('N', 'C', 'O', 'N');   // N Connection Congestion Ctrl
 const QuicTag kNRTO = TAG('N', 'R', 'T', 'O');   // CWND reduction on loss
 const QuicTag kTIME = TAG('T', 'I', 'M', 'E');   // Time based loss detection
 const QuicTag kMIN1 = TAG('M', 'I', 'N', '1');   // Min CWND of 1 packet
 const QuicTag kMIN4 = TAG('M', 'I', 'N', '4');   // Min CWND of 4 packets,
                                                  // with a min rate of 1 BDP.
 const QuicTag kTLPR = TAG('T', 'L', 'P', 'R');   // Tail loss probe delay of
                                                  // 0.5RTT.
 const QuicTag kACKD = TAG('A', 'C', 'K', 'D');   // Ack decimation style acking.
+const QuicTag kAKD2 = TAG('A', 'K', 'D', '2');   // Ack decimation tolerating
+                                                 // out of order packets.
 const QuicTag kSSLR = TAG('S', 'S', 'L', 'R');   // Slow Start Large Reduction.
 
 // Optional support of truncated Connection IDs.  If sent by a peer, the value
 // is the minimum number of bytes allowed for the connection ID sent to the
 // peer.
 const QuicTag kTCID = TAG('T', 'C', 'I', 'D');   // Connection ID truncation.
 
 // Multipath option.
 const QuicTag kMPTH = TAG('M', 'P', 'T', 'H');   // Enable multipath.
 
@@ skipping 119 matching lines @@
 // amplification factor of any mirror DoS attack.
 //
 // A client may pad an inchoate client hello to a size larger than
 // kClientHelloMinimumSize to make it more likely to receive a complete
 // rejection message.
 const size_t kClientHelloMinimumSize = 1024;
 
 }  // namespace net
 
 #endif  // NET_QUIC_CRYPTO_CRYPTO_PROTOCOL_H_