By attaching the sink when all is set up, we make it possible for an
application to listen for that event - and only then start producing
frames. Otherwise frames risk being dropped during the setup phase.
Bug: webrtc:14276
Change-Id: I0a906681fc526b0ee88c60a842afb0d68e21de14
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/270660
Auto-Submit: Erik Språng <sprang@webrtc.org>
Commit-Queue: Per Kjellander <perkj@webrtc.org>
Reviewed-by: Per Kjellander <perkj@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#37696}
e94b175c42