Merge "WM Wallpaper: Set offset and scale on WindowState level" into sc-dev am: f11c2698 am: 902dc55f am: 670835f1

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14805787

Change-Id: I68ef9a6ef0202320ac1e7b4a161bc8ca5f2f17c6