handler = function (event)
        {
            if (event.defaultPrevented || !_this.isActive())
            {
                // Do nothing if event already handled
                return;
            }

            _this.refreshPads();

            _this.queue.push(event);
        }
Starts the Gamepad Event listeners running.
This is called automatically and does not need to be manually invoked.

@method Phaser.Input.Gamepad.GamepadPlugin#startListeners
@private
@since 3.10.0