Add MipmapDrawableTest

Move these tests from CTS, because Mipmap is now hidden.
Also remove all the XML inflation code, because that is currently
disabled.

Original change: f445b8a7
Deletion from CTS: Ibfd1b8a5

Change-Id: I816581062778a9cbe868e32c3c6975cc9a74af5b
1 file changed