Add a test checking that ART Metrics are enabled in ART's CMC collector. am: 92a1eacde8 am: bf3f435550 am: 7a0caa851b

Original change: https://android-review.googlesource.com/c/platform/art/+/2458349

Change-Id: Idd8cf92e7be1cbd5fd2afe59d450c1ecef880b5e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>