Support ART's target gtests in atest.

This is first simple approach which relies on installing
the ART testing apex on the device and rebooting it.
This is not ideal if bugs prevent the device from booting.

The next goal is to run the tests in chroot without reboot.
We should also introduce dedicated ART gtest runner.

Test: atest ArtGtestsTarget --rebuild-module-info
Test: run on device using forrest
Bug: 147817606
Change-Id: I3b7f66dc27a665a6971fc688f220103c6b842b57
5 files changed