This will make it easier to extend testing, implement new features (e.g. packet culling) and experiment with new variants. Bug: webrtc:11340 Change-Id: I747f5f6cff61e11a420e43b06ffe0c4aba438c7b Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/260116 Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Commit-Queue: Erik Språng <sprang@webrtc.org> Cr-Commit-Position: refs/heads/main@{#36670}