create a new incognito window in Google Chrome with MacRuby

gistfile1.rb

#!/usr/bin/env macruby -wKU
framework 'ScriptingBridge'

chrome = SBApplication.applicationWithBundleIdentifier("com.google.Chrome")
SBApplication.ensureScriptingAdditionsLoaded

# create a new window with size of 600x600 px
chrome.windows << GoogleChromeWindow.alloc.initWithProperties( mode: "incognito", bounds: [1, 22, 600, 600] )

# first tab load macruby.org
chrome.windows.first.tabs.first.URL = "http://macruby.org/"

# bring chrome to the front
chrome.frontmost