scrollbar. The worst case is that you can never scroll down to the last
pixel. The old special case can cause problem when getViewWidth/Height
have changed which do not match mLastXXSent any more.
Remove FIND_HEIGHT from computeVerticalScrollRange per conversation with Leon.
Change computeMaxScrollY to use computeVerticalScrollRange which matches
how it computes X.
Change onMeasure to use contentToViewDimension() as it has the same logic.
e621d6ffb9