If you want to peek into the future then have a look at Draw.io running on a Chromebook. I think this is what Google has in mind for ChromeOS.
In the context of ChromeOS, Draw.io is a true 'app', in contrast to some of the "apps" in the Chrome Store that are basically bookmarks for websites. What you're seeing in this screenshot is my screen running the HTML5 based Draw.io app (BTW to the right of it I have the 60 minutes app). This is a web app running as a first-class citizen on a web OS.
Stay tuned, I suspect there's more where this came from.