I cannot find one for the "glass-1" (or, to be clear, for any glass). I've also tried searching around the device hierarchy of git repositories they have, and cannot find anything for glass{,-1} under various vendor names (including "google"). I really just don't think they posted anything.

it's the default config for the notle board, so you want "make notle_defconfig"

(For historical clarity, in the code that was released after these comments were posted.)