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This CL allows us to use mouse with horizontal scroll function,
such as tilting wheel or separate wheel for h-scroll.

Bug: 2384
Change-Id: I770c629bb2391343ce66a398e4d73ad69dde569e
Reviewed-on: https://chromium-review.googlesource.com/c/1414537
Commit-Queue: Sang Woo Ko <sangwoo108@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#628588}