Merge "Add a few tests that FRONT_BUFFER is flushing properly" into tm-dev am: 7c62346fd6

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/17507360

Change-Id: I8e8167de4204547815d164dfe24ad9b8f0211e72
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>