cros: Add timezone selector to OOBE

Add tiemzone selector for keyboard driven OOBE.

BUG=313766
R=zelidrag@chromium.org

Review URL: https://codereview.chromium.org/54713005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232666 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232666