DO NOT MERGE Disallow Wallpaper service to launch activity from background. Add a flag so that when a foreground client binds to a service, disallow the bound service to launch activity from background. Modify the WallpaperManagerService to take advantage of the new flag. Test: atest BackgroundActivityLaunchTest WallpaperManagerServiceTests Bug: 298094386 (cherry picked from https://googleplex-android-review.googlesource.com/q/commit:8efec2c0958ef8316cd24f7c79de818a7ca4cde9) Merged-In: Id4e4cb6144597cf3638f2aaa34ea455a239fa1a7 Change-Id: Id4e4cb6144597cf3638f2aaa34ea455a239fa1a7