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Xbox One gamepads send the state of the Xbox button in a separate
report from the rest of the button and axis state. On some devices,
this report will be sent repeatedly until it is acked, and further
presses and releases of the button are not reported. This causes the
button to appear "stuck" when observed from within Chrome.

This CL makes Chrome ack the Xbox report when it is received,
preventing the button from becoming stuck. This fix only affects OSX,
where Chrome uses an internal driver for Xbox devices.

BUG=846806

Change-Id: I8e44a78c56b146dcf20c530cbc397451fce9e84c
Reviewed-on: https://chromium-review.googlesource.com/1086409
Commit-Queue: Matt Reynolds <mattreynolds@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565141}