[automerger skipped] DO NOT MERGE Disallow Wallpaper service to launch activity from background. am: b7b2856de6 -s ours am: 4dec8fea1d -s ours am: b1693fdd0c -s ours

am skip reason: subject contains skip directive

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/25329531

Change-Id: I00d8202453806baba9e94c0027a10d9b352fd75b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>