add number constraint for samples per MotionEvent am: 5d17838ade am: 72c8ca4a01 am: 9964d83869 am: 90dc6dc825 am: 9830f11dc6 am: a82ace99f7
am: 711c7becb0

* commit '711c7becb01eec79d8335f335fab6e00a9164b00':
  add number constraint for samples per MotionEvent