Merge "Add a BackendUnifiedServiceManager wrapper" into main am: f8ec3975ab

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/3055742

Change-Id: Ie5d1ff5709014c03059cc5aab6e065b209d7ed32
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>