Add group and user for arc-data-snapshotd

BUG=b:160387490
TEST=/sbin/start arc-data-snapshotd

Change-Id: I8f8c1469bb053cf847f6d9a399c5151225a1eafb
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/eclass-overlay/+/2292433
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Polina Bondarenko <pbond@chromium.org>
Auto-Submit: Polina Bondarenko <pbond@chromium.org>
Commit-Queue: Polina Bondarenko <pbond@chromium.org>
diff --git a/profiles/base/accounts/group/arc-data-snapshotd b/profiles/base/accounts/group/arc-data-snapshotd
new file mode 100644
index 0000000..49e35d8
--- /dev/null
+++ b/profiles/base/accounts/group/arc-data-snapshotd
@@ -0,0 +1,3 @@
+group:arc-data-snapshotd
+gid:20148
+users:arc-data-snapshotd
diff --git a/profiles/base/accounts/user/arc-data-snapshotd b/profiles/base/accounts/user/arc-data-snapshotd
new file mode 100644
index 0000000..1d77fce
--- /dev/null
+++ b/profiles/base/accounts/user/arc-data-snapshotd
@@ -0,0 +1,6 @@
+user:arc-data-snapshotd
+uid:20148
+gid:20148
+gecos:User for arc-data-snapshotd service.
+home:/dev/null
+shell:/bin/false