The frame cadence adapter previously resulted in unconditional frame repeating at max FPS. Change this to slow down to an idle rate (1 Hz) when quality convergence in all configured spatial layers has been achieved. go/rtc-0hz-present Bug: chromium:1255737 Change-Id: Ifa593dbf8a61aa29da20ac250da332734ae82791 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/241421 Reviewed-by: Erik Språng <sprang@webrtc.org> Reviewed-by: Niels Moller <nisse@webrtc.org> Commit-Queue: Markus Handell <handellm@webrtc.org> Cr-Commit-Position: refs/heads/main@{#35547}