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Previously, HID gamepad haptics duplicated the OS-specific
logic for writing HID output reports. This CL factors out the
duplicated logic.

BUG=984155

Change-Id: I31001415f840a169a261ee9c1e84030e0e6ee17e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1754666
Commit-Queue: Matt Reynolds <mattreynolds@chromium.org>
Reviewed-by: Ovidio de Jesús Ruiz-Henríquez <odejesush@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688716}