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

net/quic/test_tools/quic_test_utils.cc

Index: net/quic/test_tools/quic_test_utils.cc
diff --git a/net/quic/test_tools/quic_test_utils.cc b/net/quic/test_tools/quic_test_utils.cc
index 26a2186c2d380f08f7d9763815523e47a1ad9ccf..f2791ec4b15a052541caef23c8ee21bbc5a664f0 100644
--- a/net/quic/test_tools/quic_test_utils.cc
+++ b/net/quic/test_tools/quic_test_utils.cc
@@ -332,7 +332,7 @@ void PacketSavingConnection::SendOrQueuePacket(SerializedPacket* packet) {
       QuicUtils::CopyBuffer(*packet), packet->encrypted_length, true));
   // Transfer ownership of the packet to the SentPacketManager and the
   // ack notifier to the AckNotifierManager.
-  sent_packet_manager_.OnPacketSent(packet, 0, QuicTime::Zero(),
+  sent_packet_manager_.OnPacketSent(packet, kInvalidPathId, 0, QuicTime::Zero(),
                                     NOT_RETRANSMISSION,
                                     HAS_RETRANSMITTABLE_DATA);
 }