They had already been doing it for a while by 2014. For example, I saw them doing it on my site in January 2012: https://www.jefftk.com/p/googlebot-running-jav

They had already been doing it for a while by 2014. For example, I saw them doing it on my site in January 2012: https://www.jefftk.com/p/googlebot-running-javascript https://www.jefftk.com/p/googlebot-running-javascript (Disclosure: I work for Google, on unrelated stuff, though I didn't at the time I wrote that blog post.)