Reduce precision of RTT in RtrpTransportControllerSend

To match precision prio to https://webrtc-review.googlesource.com/c/src/+/305022

No-Try: true
Bug: webrtc:13757
Change-Id: Ia0bdcedffed946f7d94d21fc242e22689167a395
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/305780
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#40090}
diff --git a/call/rtp_transport_controller_send.cc b/call/rtp_transport_controller_send.cc
index f2d6cd0..dc1d371 100644
--- a/call/rtp_transport_controller_send.cc
+++ b/call/rtp_transport_controller_send.cc
@@ -523,7 +523,7 @@
   RTC_DCHECK_RUN_ON(&sequence_checker_);
   RoundTripTimeUpdate report;
   report.receive_time = receive_time;
-  report.round_trip_time = rtt;
+  report.round_trip_time = rtt.RoundTo(TimeDelta::Millis(1));
   report.smoothed = false;
   if (controller_ && !report.round_trip_time.IsZero())
     PostUpdates(controller_->OnRoundTripTimeUpdate(report));