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They put the whole Android framework in a Linux container that runs on Chrome OS.

You've been able to run some Android apps inside chrome for a couple of years now: https://chrome.googleblog.com/2014/09/first-set-of-android-a.... Perhaps this is based on that?

No, the previous method was very different, and it required developers to modify their apps for Chromebooks, if they were to work at all.

This article explains it:

Ah, right! Thanks for the link.