[ Merge from http://go/wvgerrit/33440 ]
Introduce checks to guard against clock tampering.
Bug: 62037413
Test: WV unit, integration tests on angler
Test: Manual clock rollback test
Test: Playback testing (Netflix, Play movies) on sailfish
Test: GTS test on angler
Change-Id: I47938109adb5c0f5e9aefc58eb5dac156b9f16ef