* If speed <= 0.1, update every second.
* If 0.1 < speed < 1, update approximately once per
second in real time, aligned so that each second boundary
in media time has a corresponding updatae.
* If speed == 1, keep existing behavior.
* If 1 < speed <= 5, update every second in media time
* If speed > 5, update every 200ms.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=170559037
