Merge "Move kids mode relative logic to wm shell" into tm-dev am: b9109dd6

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17903530



Change-Id: I440a77841d10679028115dd58c4ab3f04eca0c1d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>