Google does not offer (m)any developer facing "official" products. Google offers "official" products for consumers or enterprises (e.g., Gmail, Cloud Platform), but all of their FOSS code, of which there are many, are all "unofficial"; they are FOSS projects that happen to be developed by Google employees but come with a normal zero liability FOSS license (as opposed to their "official" products, which do come with some liability user agreements/contracts).