Merge "Test that uid 0 isn't dropped in proto to text conversion." into main am: 941fc2973e

Original change: https://android-review.googlesource.com/c/platform/system/core/+/3531630

Change-Id: I4c2df1bb173817e91a44f0ff1a417975030ba210
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>