Bug: b/117897682
Test: unit tests
Merge of http://go/wvgerrit/65223
Gtest setup does not call the base class' setup if it's defined in the
derived class. As a result, the WvCdmEngineTests were not installing the
test root of trusts in the OEMCrypto, which leads to segfaults when
using a key derived from the root of trust when a real root of trust
doesn't exist. The test class' setup is changed to use its base class'
methods, and logging is added to handle empty derived keys.
Change-Id: Ia574c4ade48206d771d6079fb3b67ccd7653428c
5c2f991973