Revamp IRestoreSession a bit

We now supply an array of RestoreSet objects instead of wacky Bundle
shenanigans.  Also, pushed beginRestoreSession() out to the BackupManager
concrete interface class so that SetupWizard can use it.

(beginRestoreSession() is @hide, non-privileged apps cannot use it.  It's
also guarded by android.permission.BACKUP enforcement.)
8 files changed