[libria]

Not a googler, but it has little in common with GCL's approach from what I've seen. Angular and most of the MVC frameworks seem targeted at removing boilerplate data-binding out of common business apps.

Closure is a collection of high performance libraries suitable for very large javascript applications and puts emphasis on reduced code size (post-compile) and performance/memory. It doesn't have any HTML bindings so you'd have to do that manually. After compilation I'd argue Closure would be leaner than the equivalent Angular application. I'm sure Angular can scale well, but probably not like Closure. It's no less modern than Angular and still being actively used (G+, schemer).

I'd say 95% of devs are looking for something like Angular. It looks like it will significantly reduce your JS source code; Closure will do the opposite.