Squashed commit of the following:

commit 012b56fc607cf243cf4b29cb2a5f172bcbe0aecd
Author: Robert Greenwalt <robdroid@android.com>
Date:   Wed Apr 22 14:31:26 2009 -0700

    Additional fixes and tests for density.

commit 91fdc8e187551ae69e0029a4325fb3ad38fe411b
Author: Robert Greenwalt <robdroid@android.com>
Date:   Tue Apr 14 14:39:00 2009 -0700

    Fix runtime resource selection logic.

    Fix isBetterThan so that o or this may be supperior at any stage.
    Used to only handle this-better or tie at each stage, biasing against o.
    Also allows reset of unit test to succeed.  Fixes bug 1709202.