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 am: ce2063ff

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

Change-Id: Ib2e37bea5b260ae22b23a89f8a7733e70fc47248