Purpose of gexperiments1.com, gexperiments2.com and gexperiments3.com Domains?

Was checking out the network log while doing a search at Google. Found a request to a domain named gexperiments2.com:

gexperiments2.com connection

The Google search was done on one of my lab machines where I have some malware installed, so I first thought the connection was malware related, but it’s not. The gexperiments2.com domain is registered by Google as you can see in the WHOIS database:

Registrant Name: DNS Admin
Registrant Organization: Google Inc.
Registrant Street: 1600 Amphitheatre Parkway, 
Registrant City: Mountain View
Registrant State/Province: CA
Registrant Postal Code: 94043
Registrant Country: US

So, you have nothing to worry about  if you see connections to gexperiments2.com in your browser.

Google Inc. also owns gexperiments1.com and gexperiments3.com.

But I’m curious what the purpose of the connections are. Does anyone have some more info on Google’s purpose with the gexperiments2.com domain?

Thanks for reading.