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This allows pointing sticks to have different gesture properties than
normal mice, though at the moment the same properties are set for both.
See go/cros-pointing-stick-settings (Googlers only, sorry) for the
design doc.

Bug: 1114828
Test: check that pointing sticks and mice behave as normal
Cq-Depend: chromium:2465650
Change-Id: If7837f530fbeb0a4029674d4c4c81e66630bbb0a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2486866
Commit-Queue: Harry Cutts <hcutts@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826538}