Merge from master branch of Widevine repo of http://go/wvgerrit/66062
Merge from oemcrypto-v15 branch of Widevine repo of http://go/wvgerrit/62880
This CL updates the OEMCrypto v15 header to add new functions and change the
signatures of functions that need changing.
Note: It does not update all of the comments in the functions. This will be
done in a future CL.
Bug: 111939411
Test: unit tests
Test: tested as part of http://go/ag/5501993
Change-Id: Ie08a8fd4b749f61cbac08fd67ac32dcd404848fc
091a75d863