add new user/group for dlcservice

dlcservice is a dbus service for CrOS DownLoadable Content (DLC).
We add a new user/group pair for dlcservice for better security.

BUG=chromium:852164
TEST=None

Change-Id: I505e9524e337aaf7ee4203bef7ed49d4f99852ea
Reviewed-on: https://chromium-review.googlesource.com/1114298
Commit-Ready: Xiaochu Liu <xiaochu@chromium.org>
Tested-by: Xiaochu Liu <xiaochu@chromium.org>
Reviewed-by: Chirantan Ekbote (OOO 07/03 - 07/09) <chirantan@chromium.org>
Reviewed-by: Nicolas Norvez <norvez@chromium.org>
diff --git a/profiles/base/accounts/group/dlcservice b/profiles/base/accounts/group/dlcservice
new file mode 100644
index 0000000..d765e67
--- /dev/null
+++ b/profiles/base/accounts/group/dlcservice
@@ -0,0 +1,2 @@
+group:dlcservice
+gid:20118
diff --git a/profiles/base/accounts/user/dlcservice b/profiles/base/accounts/user/dlcservice
new file mode 100644
index 0000000..78c9995
--- /dev/null
+++ b/profiles/base/accounts/user/dlcservice
@@ -0,0 +1,6 @@
+user:dlcservice
+uid:20118
+gid:20118
+gecos:dbus service for CrOS DownLoadable Content (DLC).
+home:/dev/null
+shell:/bin/false