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Applist currently has some animations which records first frame number
before animation and uses a same (or really similar) formula at the
end as ui code does to calculate smoothness. These should be merged so
that when the ui code smoothness formula changes, so does applist
metrics smoothnesses.

Test: manual
Bug: 1051490
Change-Id: Iec859afacffd463404cd7630b6e79f04a67c77fc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2070739
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744701}