[ 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