Use sudo when starting session as normal user

remoting/host/installer/linux/debian/chrome-remote-desktop.init

 #!/bin/bash
 
 ### BEGIN INIT INFO
 # Provides:             chrome-remote-desktop
 # Required-Start:       $remote_fs $syslog
 # Required-Stop:        $remote_fs $syslog
 # Default-Start:        2 3 4 5
 # Default-Stop:         0 1 6
 # Short-Description:    Chrome Remote Desktop service
 ### END INIT INFO
@@ skipping 41 matching lines @@
 #   action:
 #     --start is handled specially using the user-session wrapper to start a
 #     clean log-in session. In any other case, the host script is called through
 #     sudo with the specified action flag.
 run_and_ignore_error() {
   user="$1"
   action="$2"
 
   set +e
   if [ "$action" = "--start" ]; then
-    "$USER_SESSION_PATH" --user="$user" --me2me-script="$HOST_PATH"
+    # TODO(rkjnsn): Support starting user-initiated sessions with our PAM
+    # wrapper.
+    if [ "$(whoami)" = "root" ]; then
+      "$USER_SESSION_PATH" --user="$user" --me2me-script="$HOST_PATH"
+    else
+      sudo -u "$user" --login --background "$HOST_PATH" --start
+    fi
   else
     sudo -u "$user" "$HOST_PATH" "$action"
   fi
 }
 
 do_start() {
   log_begin_msg "Starting Chrome Remote Desktop host for $1..."
   run_and_ignore_error $1 --start
   log_end_msg $?
 }
@@ skipping 40 matching lines @@
     for_each_user do_restart
     ;;
 
   *)
     log_success_msg "Usage: /etc/init.d/chrome-remote-desktop" \
         "{start|stop|reload|force-reload|restart}"
     exit 1
 esac
 
 exit 0