Google first brought the ability to run Android apps on Chrome OS with a project called the "App Runtime for Chrome (ARC)." Google built an Android runtime on Chrome OS and partnered with select developers to port a handful of Android apps. Now it sounds like Google is ready to unleash millions of Android apps onto the platform by bringing the entire Play Store to Chrome OS.
This is great news, because the more exposure Android applications get to the proper desktop world, the more developers will take that into account when developing Android applications. We need these applications to become properly resizable to prepare them for the future of the desktop/laptop Android Google claimed it's working on.
In addition, it makes Chrome OS - which is going to be phased out in the process - a lot more useful.