[automerger skipped] DO NOT MERGE Disallow Wallpaper service to launch activity from background. am: 064be0ffc5 am: 132d108dbf -s ours am: d19187fb4b -s ours

am skip reason: subject contains skip directive

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/24081613

Change-Id: Ifc62beae08288ecc4d1519317d481309b4631658
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>