[automerger skipped] Merge "[DO NOT MERGE] Make SetWallpaperCallback independent of Activity" into sc-qpr1-dev am: f1752a19f7 -s ours

am skip reason: subject contains skip directive

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/WallpaperPicker2/+/15645785

Change-Id: I72698bc1f7fd496fad92ac8ad2863fa8f334c080