Add wifi menu button to status bar of Chrome OS. Currently showing mock data as we have not hooked it up to ChromeOS shared library wifi code yet.
TEST=none
BUG=23090
Review URL: http://codereview.chromium.org/231014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@27269 0039d316-1c4b-4281-b951-d872f2087c98