The purpose is to be able to add more tests that verify that BWE still work and verify ECN behaviour e2e. Bug: webrtc:42225697 Change-Id: Ie178d29d7870bfa3211d10925d00c621617ddf48 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/370561 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Per Kjellander <perkj@webrtc.org> Cr-Commit-Position: refs/heads/main@{#43511}