Merge "Hide non-system overlay window on ActivityPicker" into pi-dev am: 7a09c061 am: d0957376 am: e4749c34 am: 1dcc4ee8 am: a2a7d183 am: 848483a8

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

Change-Id: Ib48ddd3728e537ccc56e1821dc0e576756cc7913