Merge "Hide non-system overlay window on ActivityPicker" into pi-dev am: 7a09c0613f am: d0957376c0 am: e4749c3458 am: 1dcc4ee8a1

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/13835814

Change-Id: I5038e3f5ed5963b4bfebd3aa643ce9de4296aed9