Android and Google Maps were both acquisitions, and Chrome was initially based on WebKit. I don't know when exactly Google started focusing on refinements, but I think it was before 2008.
That is not to say that nothing since then has been impressive, but I do think it's fair to call just about all of it incremental.
That is not to say that nothing since then has been impressive, but I do think it's fair to call just about all of it incremental.