Add audiorecord unit tests am: d7da8b41 am: e6c8a492

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/2189998



Change-Id: I55365d7cded67855a4acbf5e780564f81f64e8d0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>