Most of those sound like dead internally, i.e either they have nothing to do with their money making scheme (Ads), or they are to be used externally to assist t

Most of those sound like dead internally, i.e either they have nothing to do with their money making scheme (Ads), or they are to be used externally to assist that purpose, not internally. With Go being of marginal use inside Google (C++, Java, Python win the day), the only exceptions I see in the list is Closure Tools and GWT.