Merge from Widevine repo of http://go/wvgerrit/42281
This cleans up some of the oemcrypto mock code. This code is only
used for testing.
bug: 72831885
bug: 69271232
Change-Id: I8add162839d6febe56a89df84e8ae0cf0b97a2d9
Merge from Widevine repo of http://go/wvgerrit/22804
Create a class, AuthenticationRoot, to encapsulate the objects and
logic for managing either keyboxes or certificates as the device's
root of trust.
Currently the class provides the existing keybox-related functions
needed by oemcrypto's CryptoEngine. It will be extended to provide
both keybox and certificate related functions, and the logic to
determine whether keybox or certificate based authentication should
be performed.
Change-Id: I792d1bfc8e9a81bbfd2baec20e3b3d182f0392f7
