Add original_path_id to SerializedPacket and OnPacketSent. No functional change expected.

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 <stdint.h>
 
@@ skipping 1385 matching lines @@
   //  0: no padding
   //  otherwise: only pad up to num_padding_bytes bytes
   int num_padding_bytes;
   QuicPathId path_id;
   QuicPacketNumber packet_number;
   QuicPacketNumberLength packet_number_length;
   EncryptionLevel encryption_level;
   QuicPacketEntropyHash entropy_hash;
   bool has_ack;
   bool has_stop_waiting;
+  QuicPathId original_path_id;
   QuicPacketNumber original_packet_number;
   TransmissionType transmission_type;
 
   // Optional notifiers which will be informed when this packet has been ACKed.
   std::list<AckListenerWrapper> listeners;
 };
 
 struct NET_EXPORT_PRIVATE TransmissionInfo {
   // Used by STL when assigning into a map.
   TransmissionInfo();
@@ skipping 71 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_