This CL aligns the video encoding tasks to metronome tick which similar with the metronome decoding. Design doc: https://docs.google.com/document/d/18PvEgS-DehClK6twCSCATOlX-j9acmXd-3vjb0tR9-Y Bug: b/304158952 Change-Id: I262bd4a5097fdaeed559b9d7391a059ae86e2d63 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/327460 Reviewed-by: Markus Handell <handellm@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Reviewed-by: Henrik Boström <hbos@webrtc.org> Commit-Queue: Zhaoliang Ma <zhaoliang.ma@intel.com> Cr-Commit-Position: refs/heads/main@{#41469}