Google doesn't support it in any way (=not a product), it's just something the author made during her time at Google internally (=it has Google copyright) that's now open-sourced.
A Googler once told me that any code he writes during his employment with Google belongs to Google copyright-wise.
If they want to open source anything they have to ask Google for permission. It doesn't have to be hosted under the Google GitHub organization though (take Camlistore[1] as an example, although their primary repository is still hosted at googlesource.com).
This also means that if you want to contribute code to an open source project started by a Googler you will have to sign the Google CLA.
I don't think that's true for every project, as I have contributed to an open-source project[1] started by a Googler, and never had to sign a CLA, nor is the project hosted under the Google Github org.
TL;DR: Google's employment agreement means Google owns the copyright, which is what you see here. That doesn't mean we are endorsing the repo or making any claims to its importance.
So its not official Google Product yet has Google Copyright. Not sure how that works.