This verifies that receiving two RTCP SR packets is enough to get a defined capture start time stat. Bug: webrtc:13931 Change-Id: Ib5f7c2954eab6500917f25c44f523d3aedae5e94 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/291520 Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Commit-Queue: Harald Alvestrand <hta@webrtc.org> Cr-Commit-Position: refs/heads/main@{#39261}