Merge "Verify UID of incoming Zygote connections." into udc-dev am: e95d12ac8c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/26747994

Change-Id: I96b66f110b9eb2c8fa489b89f21581c5f62fd0cf
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>