Merge "Log wallpaper target changes events" into tm-qpr-dev am: 1b02a4dc

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19125489



Change-Id: Id73f0fbdae0a98863ed0c5a185da1f033ebdc7b3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>