title: GN build guide for cobalt
body: <p>The development site page and the default README.md file describe how to create cobalt based on "GYP". However, I am wondering if it can be made of "GN" like chrome.
  I found the gn build guide (<a href="https://cobalt.googlesource.com/cobalt/+/master/src/cobalt/doc/gn_quick_start.md" rel="nofollow noreferrer">https://cobalt.googlesource.com/cobalt/+/master/src/cobalt/doc/gn_quick_start.md</a>) in the cobalt's doc directory, but it gives me an error in my dev environment. I will check what the problem is. But first of all, I want to know if "GN" can officially make cobalt.</p>