launch_chrome.py

#!/usr/bin/env python

import subprocess
import wnck
import gtk
import time


screen = wnck.screen_get_default()
while gtk.events_pending():
    gtk.main_iteration()

window_list = screen.get_windows_stacked()

last_active = None
for window in window_list:
    if window.get_application().get_name() == "Google Chrome":
        last_active = window

if last_active:

    timestamp = int(time.time())
    last_active.activate(timestamp)

else:

    subprocess.Popen("google-chrome")