How does Google encode the CSS classes and ID?

Look at the name of the classes in the html block. They have been encoded to make it hard to understand.

<div id=":21r" class="ii gt m14b0b8af41495ba9 adP adO">
    <div id=":21o" class="a3s" style="overflow: hidden;">
        <div dir="ltr">
            <div class="adL"></div>
        </div>
    </div>
</div>

I don't think Google engineers are so jobless to encode classes like these manually. They must have used some tools for encoding the classes. Is there any service available for doing this?