Require that method callers always provide relevant paths, instead of
relying on constructor. Move DisplayMetrics to be an overall parser
parameter, and move PARSE_TRUSTED_OVERLAY to flags.
Parse split APKs and apply deterministic ordering based on split
names. Assert consistent package name and version code across all
split APKs in a package, and enforce unique split names and required
base APK.
Collect certificates for split APKs, enforcing they're all signed
consistently. Better flow control and resource cleanup when
collecting certs. Refactor validation code so it's easier to reason
about. Cleaner maintenance of read buffer when draining stream
contents.
Change-Id: I8bc8c62095fbb933227b9e76ad8771f4b1246fe8
275e085d5a