Updating Security Key logic to work on OSX

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.
 
 NAME=org.chromium.chromoting
 HOST_BUNDLE_NAME=@@HOST_BUNDLE_NAME@@
 PREFPANE_BUNDLE_NAME=@@PREFPANE_BUNDLE_NAME@@
 CONFIG_DIR=/Library/PrivilegedHelperTools
@@ skipping 64 matching lines @@
         sleep "$relaunch_in"
       else
         # If the host ran for long enough, reset the crash counter.
         host_failure_count=0
       fi
     fi
 
     # Execute the host asynchronously and forward signals to it.
     trap "handle_signal" $SIGNAL_LIST
     host_start_time=$(date +%s)
-    "$HOST_EXE" --host-config="$CONFIG_FILE" &
+    "$HOST_EXE" --host-config="$CONFIG_FILE" \
+                --ssh-auth-sockname="/tmp/chromoting.$USER.ssh_auth_sock" &
     HOST_PID="$!"
 
     # Wait for the host to return and process its exit code.
     while true; do
       wait "$HOST_PID"
       EXIT_CODE="$?"
       if [[ $SIGNAL_WAS_TRAPPED -eq 1 ]]; then
         # 'wait' returned as the result of a trapped signal and the exit code is
         # the signal that was trapped + 128. Forward the signal to the host.
         SIGNAL_WAS_TRAPPED=0
@@ skipping 56 matching lines @@
   # stdin until the pipe is broken.
   cat 2>/dev/null || true
   open "$PREF_PANE_BUNDLE"
 elif [[ "$1" = "--run-from-launchd" ]]; then
   echo Host started for user $USER at $"$(date)"
   run_host
 else
   echo $$
   exit 1
 fi