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Fixed play and pause animation procedure for scroll animations

These changes were made to bring the implementation into alignment with
recent spec changes:

https://github.com/w3c/csswg-drafts/pull/5059

Inline spec comments were updated to match as well.

Bug: 1081267
Change-Id: Ic4186905377c836b644fed158efe25c369b4cfe0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2386339Reviewed-by: Olga Gerchikov <gerchiko@microsoft.com>
Reviewed-by: Kevin Ellis <kevers@chromium.org>
Commit-Queue: Jordan Taylor <jortaylo@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#803575}