Merge "Add utility for isWallpaperSupported." into tm-dev am: 9417012064

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/17303344

Change-Id: I297fafadf3124771488d6f7176876de1810322c0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>