In the topic in Chrome Talk are the following 2 messages:

Originally Posted by kirby145

Ever since Firefox I have become a middle click scroll addict! I hope chrome adds this soon.

If you haven't used this, it's when you hold middle mouse button and move mouse up or down to scroll.

Originally Posted by Zamadatix

glad to say it does in mine, guess it was updated. If only they would put mouse gestures in!

It however does not work in my Google Chrome (which says it's up to date at version 1.0.154.48).

Is the middle click feature supposed to work?
and if so, does anyone know how to fix the fact that it's not working here?

I agree! This seems like such a basic thing. For me, it switches to zoom in/zoom out, which is really annoying. I want to scroll up, but instead everything is now in size 72 font

You need to be on the Chrome dev channel to access the new features of Chrome (Including middle-click scroll, F11 fullscreen, etc..)

You can change channel by downloading the Chrome Channel Chooser.