ObjectAnimator animateBoundScroll(){
  float curScroll=getStackScroll();
  float newScroll=getBoundedStackScroll(curScroll);
  if (Float.compare(newScroll,curScroll) != 0) {
    animateScroll(curScroll,newScroll,null);
  }
  return mScrollAnimator;
}

ObjectAnimator animateBoundScroll ( ) { float curScroll = getStackScroll ( ) ; float newScroll = getBoundedStackScroll ( curScroll ) ; if ( Float . compare ( newScroll , curScroll ) != 0 ) { animateScroll ( curScroll , newScroll , null ) ; } return mScrollAnimator ; }
animates the stack scroll into bounds
