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Previously, if a user swiped up the full 200px and released, the
animation would re-play from the very beginning.

Bug: 1014679
Change-Id: I6810fd371d375b812e206b9e6e8067a5644bf86e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1910872Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: John Lee <johntlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714594}