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This is required in order to do a finch-driven staged rollout of the
smooth scrolling feature.

Bug: 908990
Change-Id: Ic2bcd64a787b5f543bdbd0d56310fb3967dce5c8
Reviewed-on: https://chromium-review.googlesource.com/c/1352524
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611448}