Add throughput test and verify observe mode state for tech tests am: a8916d51be

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/3470668

Change-Id: I98a1556b63874782f37992e9fa041e42570133db
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>