A rough draft about ChromeOS structure (containing some errors probably)
https://chromeos.dev/en/posts/bringing-steam-to-chromeos
https://chromeos.dev/en/posts/making-android-more-secure-with-arcvm
https://chromium.googlesource.com/chromiumos/platform/crosvm/
Interesting. So basically it's a pretty basic GNU/Linux distro based on some release of Gentoo Linux with some custom proprietary software that spies on the user, has themes added on top of it and it uses a lot of KVMs for things.
Probably the only GNU/Linux distro that I'll never touch, ever.
You might better check open fydeos then. I'm not saying ChromeOS is the ultimate distro but it's very refined and with a strong commercial support for standard users. You can see it like a trojan horse.