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This reverts commit af74d157.

Reason for revert: pref regression in queuing durations

Original change's description:
> Web-animation: Remove some uses of PlayStateUpdateScope.
> 
> PlayStateUpdateScope is problematic for handling timing of finished
> promises in addition to not conforming with the algorithm outlined in
> the web-animations spec. This patch removes several uses of
> PlayStateUpdateScope and refines handling of pending flags.
> 
> Bug: 960944
> Change-Id: I093a3aa86084adfbe128a5aedd36206d67dd12c8
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1851927
> Commit-Queue: Kevin Ellis <kevers@chromium.org>
> Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#705966}

TBR=kevers@chromium.org,majidvp@chromium.org,smcgruer@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 960944
Change-Id: Ib16d862d5834f837717e64bb86277860e50ec11a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1866624Reviewed-by: Kevin Ellis <kevers@chromium.org>
Reviewed-by: Majid Valipour <majidvp@chromium.org>
Commit-Queue: Kevin Ellis <kevers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707821}