Merge from Widevine repo of http://go/wvgerrit/96843
This CL modifies the system time used by the reference OEMCrypto so
that it recovers from a clock rollback. When the clock rolls back, it
now adjusts the current time and continues forward. This is needed
when running unit tests on some platforms that reset the clock at
the beginning of a test.
Bug: 152649427
Test: unit tests on buildbot. (No production code on Android)
Change-Id: I7edcdc0cd4e5938c9a54e745d3a0e008f9eb13ed
67aaa1c309