Code review comment for lp:~kdub/mir/overlay-gl-program

Ok I understand the GLRenderer can get arbitrarily elaborate and it may not be a good idea to use the same objects/shaders to render both. I'm all for KISS! Also, I think you're saying GLRenderer could be replaced but "overlay rendering" (now I'm using the term that I said I didnt like) cannot, and making them share code might cause problems for those that want to replace the GLRenderer. Understood.

You said you'd change the class name above. Could we find a different designation for these surfaces once they 've been rejected as overlays.