chrome-chromeos: add headless ozone platform to chrome

Rename test to headless ozone platform and enable it for chrome

BUG=b:160309778
TEST=manual

Change-Id: If076a51581de9bb4d430ec1cecea6300e069ab78
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/2275768
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Polina Bondarenko <pbond@chromium.org>
Auto-Submit: Polina Bondarenko <pbond@chromium.org>
Commit-Queue: Achuith Bhandarkar <achuith@chromium.org>
2 files changed