Merge "[pm] describe warning dialog behavior in javadoc" into udc-dev am: 416dd2e5 am: 50f4d8fe

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23438327



Change-Id: Ifb3ee9d05438ea54b0021b5df78791d9189a5dd7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>