Provide non-interactive APIs to BackupManagerService

- Add return codes for backup and restore in FullBackupRestoreObserver
- Add non-interactive backup and restore methods in BackupManagerService
- Add per-file filters for backup in BackupAgent

This is a roll-up CR from cm-11.0 and also contains the following Change-Ids:
- I808cdc1c3b374e29d8438c7051e37c24a7a9d991 fixes adb restore
- I54983d8f270285942db20eaff1e6de4229ec781e fixes result code-passing

Change-Id: Ic1dfd5d144507263baad76f7088a52eab2fb283a