Minor change to QUIC's retransmission to not link old retransmissions

net/quic/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 <limits>
 #include <list>
@@ skipping 126 matching lines @@
 const int kUFloat16MantissaBits = 16 - kUFloat16ExponentBits;  // 11
 const int kUFloat16MantissaEffectiveBits = kUFloat16MantissaBits + 1;  // 12
 const uint64 kUFloat16MaxValue =  // 0x3FFC0000000
     ((GG_UINT64_C(1) << kUFloat16MantissaEffectiveBits) - 1) <<
     kUFloat16MaxExponent;
 
 enum TransmissionType {
   NOT_RETRANSMISSION,
   FIRST_TRANSMISSION_TYPE = NOT_RETRANSMISSION,
   HANDSHAKE_RETRANSMISSION,  // Retransmits due to handshake timeouts.
-  ALL_UNACKED_RETRANSMISSION,  // Retransmits of all unacked packets.
+  ALL_UNACKED_RETRANSMISSION,  // Retransmits all unacked packets.
+  ALL_INITIAL_RETRANSMISSION,  // Retransmits all initially encrypted packets.
   LOSS_RETRANSMISSION,  // Retransmits due to loss detection.
   RTO_RETRANSMISSION,  // Retransmits due to retransmit time out.
   TLP_RETRANSMISSION,  // Tail loss probes.
   LAST_TRANSMISSION_TYPE = TLP_RETRANSMISSION,
 };
 
-enum RetransmissionType {
-  INITIAL_ENCRYPTION_ONLY,
-  ALL_PACKETS
-};
-
 enum HasRetransmittableData {
   NO_RETRANSMITTABLE_DATA,
   HAS_RETRANSMITTABLE_DATA,
 };
 
 enum IsHandshake {
   NOT_HANDSHAKE,
   IS_HANDSHAKE
 };
 
@@ skipping 900 matching lines @@
   // Zero when the packet is serialized, non-zero once it's sent.
   QuicByteCount bytes_sent;
   size_t nack_count;
   // Reason why this packet was transmitted.
   TransmissionType transmission_type;
   // Stores the sequence numbers of all transmissions of this packet.
   // Must always be NULL or have multiple elements.
   SequenceNumberList* all_transmissions;
   // In flight packets have not been abandoned or lost.
   bool in_flight;
+  // True if the packet can never be acked, so it can be removed.
+  bool is_unackable;
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_PROTOCOL_H_