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This uses the InputControllerEvDev to allow application to turn off
mouse acceleration when using pointer lock on Chrome OS.

Bug: 982379
Change-Id: Ie3b9d5f67d7a5514b90b25d8b13e9f6f5b01e390
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2188908
Commit-Queue: James Hollyer <jameshollyer@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>
Reviewed-by: Ovidio de Jesús Ruiz-Henríquez <odejesush@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781628}