Add throughput test and verify observe mode state for tech tests am: a8916d51be am: 49dea9ecdf

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

Change-Id: I0e821e8e1fd966b57182bd62f2ff8cbcd6b5cd70
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>