The Bitmap functions to get the scaled width/height couldn't actually
do the right thing because they didn't know the destination they would
be drawing to. Now there are two forms of them, taking an explicit
parameter specifying the destination.
Applications can now declare that they support small, normal, or
large screens. Resource selection can also be done based on these
sizes. By default, pre-Donut apps are false for small and large,
and Donut or later apps are assumed to support all sizes. In either
case they can use <supports-screens> in their manifest to declare
what they actually support.
