Merge "Specify the wallpaper blast wrapper is a wallpaper window" into sc-dev...

Merge "Specify the wallpaper blast wrapper is a wallpaper window" into sc-dev am: 0954cfe6 am: 0efe115c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15132873

Change-Id: I7a1f65090af482e688838b66e67f58ee8aec3c8d