add number constraint for samples per MotionEvent am: 5d17838ade am: 72c8ca4a01 am: 9964d83869 am: 90dc6dc825 am: 9830f11dc6 am: a82ace99f7 am: 711c7becb0
am: 928a4879e4

* commit '928a4879e4a2b996bccf007d390f7f2719e9a901':
  add number constraint for samples per MotionEvent