Merge from widevine repo of http://go/wvgerrit/21710
This is the header changes for OEMCrypto v12. This includes
Provisioning 3.0 changes.
This CL was split off from http://go/wvgerrit//18603 because that
review is now concentrating on clarification and wording issues.
This CL is just for the header, and API changes.
Change-Id: I7cc423726433dcac9fb907246b6b6dd64f5c3367