Connect a pad into its index slot and notify every subscriber.
Empty slot padIndex and notify every subscriber.
Focus windowId and press button on slot padIndex (value 0..1, default 1).
Optionalvalue: numberFocus windowId and release button on slot padIndex.
Focus windowId and set the axes of slot padIndex.
Move input focus (or clear it with null) and push changed snapshots.
Gamepad mock plus input controls.