Just as it's done on the desktop, Google is pushing out a developer build of Chrome for Android for those who want the latest and greatest features and are willing to live with some pesky bugs in return.
The Chrome dev channel gives you insider access to what Google is experimenting with. Of course, that means there can be lots of bugs, though Google is betting on wide usage will give it the data it needs to squash them.
Just like with the beta build, you can download the dev browser on your device but keep the stable version as default if you want something less fussy. If you want to check the new browser out, you can grab it now from the Play Store.
The story behind the story: Google works on new features by trying them out on multiple early access versions of its browser, graduating them to the stable channel when they're ready. The dev channel has been on Windows, Mac, and Chrome OS already, but this is the first appearance on mobile. Desktop versions also run a Canary channel, which is the most raw and uncut version of Chrome.