Allow additional flags to be passed to native device tests.

Adds an option to GTest that allows additional test flags to be passed to the test execution command on the device. Driving use case: Widevine has tests that can execute against different license environments based on a flag passed to the test. This option enables execution of automated tests against multiple license environments by passing a different option flag to the TF test command.

Bug: 23593222

Change-Id: Ie3acedd1556b318a8b9b65001118047d8002a509
1 file changed