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

* commit 'a82ace99f76ed815e16ab64eae2e9e55871a8b8f':
  add number constraint for samples per MotionEvent