message: Checked diff big enough before dragging
  Copied this from ScrollView (copying all of it from ScrollView)
diff: @@ -62,6 +62,10 @@ public class CoordinatorLayoutView extends CoordinatorLayout {
  break;
  }
  case MotionEvent.ACTION_MOVE:
  + int activePointerIndex = ev.findPointerIndex(activePointerId);
  + int y = (int) ev.getY(activePointerIndex);
  + int yDiff = Math.abs(y - lastMotionY);
  + if (yDiff > touchSlop)
  dragging = true;
  break;
  case MotionEvent.ACTION_CANCEL:
  