To migrate on new GetStats API and properly support target encode bitrate for regular, simulcast and svc cases we need to calculate it inside video quality analyzer getting values from SetRates in VideoEncoder. Bug: webrtc:11381 Change-Id: Ia37acac764ed3c30f64cdbfda8906d543fa03ae2 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/171501 Commit-Queue: Artem Titov <titovartem@webrtc.org> Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org> Reviewed-by: Patrik Höglund <phoglund@webrtc.org> Cr-Commit-Position: refs/heads/master@{#30881}