Simply counting people yields 29% white women, 19% women of color, 21% men of color, 30% white men.
Not a very exact science, though - I left out groups above a certain size (for example picture from Anti-Trump demonstration or MLKday), and in some cases I couldn't recognize the people. Many white men come from office shots where they linger in the background, whereas there are many tweets explicitly featuring female or black engineers. It seems by only looking at their "media timeline" I also missed photos like this one: https://twitter.com/Every28HoursPla/status/83166688771703193... (which they retweeted).
I'll try to find time for a better "analysis", ideally including texts.
Compared to last time there seem to be now more posts boasting technology at Google. For example there were several about Tensor Flow, all featuring the same white guy (I counted him for every instance).
I couldn't find the time when I last posted about lifeatgoogle, would have liked to look at their tweets from around then.
For comparison employee stats from 2014: http://mashable.com/2014/05/28/google-employee-demographics/... - 70% male, 91% white or asian.