[ Cherry-pick of v19 http://go/wvgerrit/219330 ]
[ Merge of http://go/wvgerrit/219454 ]
For two-staged provisioning devices, the behavior of
CdmEngine::Unprovision() varied by platform and context.
For production Android, unprovisioning would remove both;
for production and testing CE CDM it would only remove
DRM provisioning; for testing Android may remove both or
remove everything (both certs and licenses).
This behavior was not documented, making use of the
CdmEngine::Unprovision() API rather unpredictable.
This change attempts to document the unpredictable behavior
and add a way to explicitly remove the OEM certificate
in the core code.
The new CdmEngine::UnprovisionOemCert() will remove only
the OEM certificate.
Bug: 391469176
Test: run_x86_64_tests
Test: WvTs on oriole
Change-Id: Ib2f6ef61f45b5320c71d7e8e8460f7fe8e0e2248
daf291955f