1. The implementation was not taking into account the transformation
matrices if the views.
2. The rectangle that was passed as an argument to
ViewParent.requestChildRectangleOnScreen was modified by
some implementations - now care is taken to prevent it.
3. The scroll of child was used when a rectangle of its coordinate
system was mapped to one in the parent system. However, the
scroll shows how much a parent has scrolled its descendants, so
the scroll of the parent has to be used not the child.
bug:7139556
Change-Id: I5b09eb7f105047e95282f74308968d5465831c84
ee6c6ae5b2