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

net/quic/quic_connection.cc

Index: net/quic/quic_connection.cc
diff --git a/net/quic/quic_connection.cc b/net/quic/quic_connection.cc
index 638f7fe5476556e404fa198ec075db86f77bdbff..1bf3903c8a6eee5f5173e5b40d72c2020bb132cc 100644
--- a/net/quic/quic_connection.cc
+++ b/net/quic/quic_connection.cc
@@ -1644,7 +1644,8 @@ bool QuicConnection::WritePacket(SerializedPacket* packet) {
   }
   if (result.status != WRITE_STATUS_ERROR && debug_visitor_ != nullptr) {
     // Pass the write result to the visitor.
-    debug_visitor_->OnPacketSent(*packet, packet->original_packet_number,
+    debug_visitor_->OnPacketSent(*packet, packet->original_path_id,
+                                 packet->original_packet_number,
                                  packet->transmission_type, packet_send_time);
   }
   if (packet->transmission_type == NOT_RETRANSMISSION) {
@@ -1667,8 +1668,8 @@ bool QuicConnection::WritePacket(SerializedPacket* packet) {
       sent_packet_manager_.EstimateMaxPacketsInFlight(max_packet_length()));
 
   bool reset_retransmission_alarm = sent_packet_manager_.OnPacketSent(
-      packet, packet->original_packet_number, packet_send_time,
-      packet->transmission_type, IsRetransmittable(*packet));
+      packet, packet->original_path_id, packet->original_packet_number,
+      packet_send_time, packet->transmission_type, IsRetransmittable(*packet));
 
   if (reset_retransmission_alarm || !retransmission_alarm_->IsSet()) {
     SetRetransmissionAlarm();