Last Updated: October 2nd, 2014
Update: the app has been pulled from the Play Store, presumably because of the "Chrome" name. You can now find it under the name ARChon Packager.
Earlier this month, Google officially made it possible to run a handful of Android apps on Chrome OS. Hardly a week later, a developer came along and produced a means of running theoretically any Android app within Chrome on Windows, Mac, and Linux (including Chromebooks).
Last Updated: September 11th, 2014
Update: Hangouts 2.3 is now rolling out to devices in stages. If you rather not wait, we can help you download it manually. And as it turns out, this Dialer just links to a tab within the new Hangouts app. It is not a separate, standalone piece of software.
Hangout's Google Voice integration is finally happening. We started seeing functionality merge into Hangouts overnight, but there remain a few kinks to work out that we're hoping an upcoming app update will fix.