Make curtain-mode controllable by policy.

remoting/host/installer/mac/PrivilegedHelperTools/org.chromium.chromoting.me2me.sh

 #!/bin/sh
 
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Version = @@VERSION@@
 
 NAME=org.chromium.chromoting
 CONFIG_DIR=/Library/PrivilegedHelperTools
 HOST_EXE=$CONFIG_DIR/$NAME.me2me_host.app/Contents/MacOS/remoting_me2me_host
 PLIST_FILE=$CONFIG_DIR/$NAME.me2me_host.app/Contents/Info.plist
 ENABLED_FILE=$CONFIG_DIR/$NAME.me2me_enabled
 CONFIG_FILE=$CONFIG_DIR/$NAME.json
 PREF_PANE_BUNDLE=/Library/PreferencePanes/$NAME.prefPane
 
 # The exit code returned by 'wait' when a process is terminated by SIGTERM.
 SIGTERM_EXIT_CODE=143
 
 # Range of exit codes returned by the host to indicate that a permanent error
 # has occurred and that the host should not be restarted. Please, keep these
 # constants in sync with remoting/host/constants.h.
 MIN_PERMANENT_ERROR_EXIT_CODE=2
-MAX_PERMANENT_ERROR_EXIT_CODE=5
+MAX_PERMANENT_ERROR_EXIT_CODE=6
 
 HOST_PID=0
 SIGNAL_WAS_TRAPPED=0
 
 handle_signal() {
   SIGNAL_WAS_TRAPPED=1
 }
 
 run_host() {
   # This script works as a proxy between launchd and the host. Signals of
@@ skipping 57 matching lines @@
   # Wait for the parent (System Preferences applet) to die, by reading from
   # stdin until the pipe is broken.
   cat 2>/dev/null || true
   open "$PREF_PANE_BUNDLE"
 elif [[ "$1" = "--run-from-launchd" ]]; then
   run_host
 else
   echo $$
   exit 1
 fi