Semantically, the permission should be defined at some higher level (BackgroundManifest_*?) and the uses-permission should be in the Manifest snippet of each subsystem that uses the permission.  I used SyncManifest* as that higher level manifest since it was expedient.  It seems like churn to separate out such a BackgroundManifest for generic things right now, but I'm happy to do it if we foresee other users.  And IIRC Android warns-but-accepts repeated uses-permission tags -- we already have a few.  Final word?