Get message - a list of your email with a preview on the google search page

Today, once again checking the correct spelling of various sentences in English, before sending a letter, I typed in google - I get the message. To my surprise, in addition to the result with the correct spelling of the sentence, I received a list of my emails with a preview on the google search page (gmail itself is blocked at work). In google, I was logged in advance. Checked from several other accounts - does not work. Does anyone know what it is and how to make it work on any account?


UPDATE:
www.google.com/experimental/gmailfieldtrial

This is automatically enabled on accounts attached to phones with the Google Now application.