Propagate RtpPacketReceived::arival_time_ms() when demuxing RTX packets

Bug: webrtc:11163
Change-Id: I3bf4a662c84e9b31e0b0fc15660d360413a4aee1
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/161224
Reviewed-by: Sebastian Jansson <srte@webrtc.org>
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Commit-Queue: Per Kjellander <perkj@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29996}
diff --git a/call/rtx_receive_stream.cc b/call/rtx_receive_stream.cc
index 3c8b53b..9e4a41b 100644
--- a/call/rtx_receive_stream.cc
+++ b/call/rtx_receive_stream.cc
@@ -64,6 +64,7 @@
   media_packet.SetSequenceNumber((payload[0] << 8) + payload[1]);
   media_packet.SetPayloadType(it->second);
   media_packet.set_recovered(true);
+  media_packet.set_arrival_time_ms(rtx_packet.arrival_time_ms());
 
   // Skip the RTX header.
   rtc::ArrayView<const uint8_t> rtx_payload = payload.subview(kRtxHeaderSize);