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This will be used to show or hide a separate set of settings for
pointing sticks. For now, the visibility logic is modified to show mouse
settings if either a mouse or pointing stick is connected, to preserve
existing behaviour.

To test, you can use a Python script [0] to create a fake pointing
stick with uinput.

[0]: https://gist.github.com/HarryCutts/e17783d9475e45abcc4b73b9e7aabb7a

Bug: 1114828
Test: check `hasPointingStick` value with and without a pointing stick

Change-Id: I917c8ead69a126280752a9a1a4b4bea609c7e33c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2427888
Auto-Submit: Harry Cutts <hcutts@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Yaron Friedman <yfriedman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812790}