[commoner]

Google Chrome uses the RLZ tracking identifier for some installations.

"RLZ gives us the ability to accurately measure the success of marketing promotions and distribution partnerships in order to meet our contractual and financial obligations."

https://blog.chromium.org/2010/06/in-open-for-rlz.html

[SquareWheel]

While not exactly A/B testing as discussed above, that's still a relevant link. Thank you for sharing.

[commoner]

No problem. There's more information in the Google Chrome Privacy Whitepaper:

https://www.google.com/intl/en/chrome/privacy/whitepaper.htm...