Using ctx.Config().(Config) everywhere is a mouthful, and it is
inefficient to do the type assertion. Put the Config interface into
the context, and provide an AConfig() to return the Config already
converted to the right type.
Change-Id: I301a1fd7d2a005580aabca7866a37c5d42ad8c69
Art needs a custom module type in order to perform complicated
build logic like depending on environment variables and varying
cflags based on cpu variant. Export enough of the types and
functions from cc for art_cc_library to inherit from cc_library.
While I'm touching every line, also rename the New* methods
to *Factory.
Change-Id: I7123aa47019c4ced7a1ab57c394225bc7844b5ea
Colin Cross