It already handles your Gmail and eventually wants to have you surf its Wave. It hopes you’ll take a shine to Chrome. It assigns you a phone number so you can have a Voice. You use its applications to compose professional, smart-looking Docs when you’re not being a messy, profane Blogger. It has desires for the world’s Books. Then there’s that whole web Search thing. In addition to every other aspect of your technology-centric life where Google has planted its flag, the company on Thursday announced that it was launching Public DNS, its own domain name service.