Merge "Backup SystemUI as system user" into tm-qpr-dev

        // restored. This distinction is important for system-process packages that live in the

        // system user's process but backup/restore data for non-system users.

        // TODO (b/123688746): Handle all system-process packages with singleton check.

        final int instantiatedUserId =

                PLATFORM_PACKAGE_NAME.equals(packageName) ? UserHandle.USER_SYSTEM : targetUserId;

        boolean useSystemUser = PLATFORM_PACKAGE_NAME.equals(packageName)

                || getPackageManagerInternal().getSystemUiServiceComponent().getPackageName()

                        .equals(packageName);

        final int instantiatedUserId = useSystemUser ? UserHandle.USER_SYSTEM : targetUserId;

        IPackageManager pm = AppGlobals.getPackageManager();

        ApplicationInfo app = null;