Add audiorecord unit tests am: d7da8b41 am: e6c8a492 am: 60cf9b70 am: 53c82699

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



Change-Id: I822a53f8bf97545e3e3f9858d3d941f79e1f1415
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>