Part of the drawables for DpiTest is a nodpi directory, but the
LOCAL_AAPT_FLAGS didn't specify it.
Bug: 3165492
Change-Id: I989068d76f922db6048e6db7cc6822ab3234d36e
Not complete, only for experimentation at this point.
This includes a reworking of how screen size configurations are matched,
so that if you are on a larger screen we can select configurations for
smaller screens if there aren't any exactly matching the current screen.
The screen size at which we switch to xlarge has been arbitrarily
chosen; the compatibility behavior has not yet been defined.
Change-Id: I1a33b3818eeb51a68fb72397568c39ab040a07f5
