Merge "Move kids mode relative logic to wm shell" into tm-dev am: b9109dd6 am: 8944a2ed

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



Change-Id: Ie6fd0cf78dae88905c49f7248cdb3c5bc3cfd9dc
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>