While Google Analytics is not ready to track Google Chrome, GetClicky and others started to integrate Chrome as a separate browser.
But at this point this is not really a problem. Chrome usage will be minimal and won't really affect much website traffic unless users activate the incognito mode.
When a user goes in incognito mode and returns to the website, they will not be counted as a return visitor, but rather a new visitor.
This will obviously blurry accuracy of web measurement further.