I'm not sure if it was ever an official thing but I remember accessing their pages and speaking to their reps at conferences regarding Angular.

For example, if you look at the Angular 1.2 docs, look at the bottom of the page here and you'll see Google included their copyright on those docs https://code.angularjs.org/1.2.27/docs/guide/ie

I doubt it was ever an official Google product because open source packages generally aren't. But there was a team at Google working on it when Angular 1.x was big.