Rails: Proxy Authentication in Watir (Chrome Drive

Question

i've tried to add proxy authentication in chrome webdriver which run on the watir like belows:

require 'watir'
proxies = ['--proxy-server=185.264.167.184:63109', '--proxy-auth=username:password']
browser = Watir::Browser.new :chrome, :switches => proxies
browser.goto(url)

when the browser run it still asking me username and password like below:

And the question is how to set username and password in chrome driver which run on the watir ?