Add user and user group for ml-service-dbus

This is needed to bootstrap the dbus connection between chrome and
ml-service after ml-service is run in a new user namespace.

BUG=chromium:933017
TEST=by display-accts.py | grep 20177, there is only mlservice
TEST=using it.

Change-Id: Ice367b78fc2da849a47e5ebeac9ef0922c67e553
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/eclass-overlay/+/2742398
Tested-by: Honglin Yu <honglinyu@chromium.org>
Commit-Queue: Honglin Yu <honglinyu@chromium.org>
Reviewed-by: Allen Webb <allenwebb@google.com>
diff --git a/profiles/base/accounts/group/ml-service-dbus b/profiles/base/accounts/group/ml-service-dbus
new file mode 100644
index 0000000..89488a8
--- /dev/null
+++ b/profiles/base/accounts/group/ml-service-dbus
@@ -0,0 +1,3 @@
+group:ml-service-dbus
+gid:20177
+users:ml-service-dbus
diff --git a/profiles/base/accounts/user/ml-service-dbus b/profiles/base/accounts/user/ml-service-dbus
new file mode 100644
index 0000000..c865742
--- /dev/null
+++ b/profiles/base/accounts/user/ml-service-dbus
@@ -0,0 +1,6 @@
+user:ml-service-dbus
+uid:20177
+gid:20177
+gecos:Owner of the CrOS Machine Learning D-Bus service
+home:/dev/null
+shell:/bin/false