Merge from widevine of http://go/wvgerrit/23283
This CL adds some big usage table functionality to the oemcrypto
mock and unit tests.
Still missing are: backwards compatibility, defragging the table,
haystack code, and lots of new unit tests.
The haystack now reports it doesn't support usage tables, so that
the unit tests will pass. This will be fixed in a future CL.
b/31458046
b/32554171
b/34173776
b/34174907
Change-Id: I6e08e76f7612ffb77e413151e00f830339298c62
3d977d999c