Google will probably do it in a very open way like they do when they try to enforce other web standards. They will probably clearly post criteria for what make

Google will probably do it in a very open way like they do when they try to enforce other web standards. They will probably clearly post criteria for what makes an ad acceptable or not and state that Chrome will block it if it doesn't meet them. Or maybe Chrome will show them but somehow punish the webmaster like they do to sites that don't use HTTPS or have mobile friendly pages.