This is useful in debugging the latency from a packet is enqueued until it's sent. Bug: webrtc:11617 Change-Id: Ic2f194334a2e178de221df3a0838481035bb3505 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/176231 Reviewed-by: Erik Språng <sprang@webrtc.org> Commit-Queue: Johannes Kron <kron@webrtc.org> Cr-Commit-Position: refs/heads/master@{#31381}