Apple's own MFi program how it works is by providing documentation, components, tools and technical support for partners to create accessories. Then his partner was able to promote their products with the Apple certification logo.
While the certification program 'Made For Google' has been confirmed by two sources who claimed to know about the program.
The launch itself will be done in the near future, possibly along with the launch of the new Pixel on 4 October.
If this rumor is true there will be various accessories with Google certification labels. And accessories such as powerbank, charger and the like are likely to be instantly available when Pixel 2 is launched.