Merge "Add CredDescRegistry unit tests" into udc-dev am: e334986d9b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21689143

Change-Id: I7ff934db9e16781fc57d2acb6a61c62dc01259c1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>