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This CL fixes an issue with Mac scrollbars which caused scrollbar
track clicks to not get animated.

Bug: 1025147
Change-Id: I7304cb8e9a6c02439ee7c4a6e7f6c1d3dbfeebf2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1917956
Commit-Queue: Rahul Arakeri <arakeri@microsoft.com>
Reviewed-by: David Bokan <bokan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#716909}