What the hell, I will wade into this morass. Big caveat- I'm an engineer, not an IT guy and what I say applies only to the infinitesimally small sliver if the USA's engineering field I've played in:
(1) At present my perception is that there are more female than male engineering students. Note: I'm talking about the small subset who are US citizens - the only flavor I can hire.
(2) The women tend to interview far better; a lot of the males have some sort of weird video-game-derived socio-alco-psycho-logical strangeness that makes me want to airgap my projects from them.
(3) from (2) our junior staff is actually about evenly matched or slightly biased towards the female side; starting salaries for the women are definitely higher.
(4) At the ten year mark we have few women left. First, we - meaning every org Ive worked in - treats women like crap. Less educational opportunities... Nastier interpersonal interactions... they get screwed in tetms of advancement for at least a year after taking materbity leave... etc.
Two types survive: super stars who would perform well no matter what you do to them, and on the other end of the bell curve sociopathic bitches who are able to rise with extraordinary speed because of worthless male managers who think only with their dicks. Not that the sociopaths ACTUALLY put out, but these guys are really, really stupid
(5) Our female super stars do not mix well with the average dickhead (literal and metaphorical) line and personnel managers. They tend to stay technical and become recognized experts and technical leaders. Sociopathic women in the line management feel threatened by the smarter ones in the tech leadership side and will do VERY nasty things to keep 'em down. Supported of course by our sexually frustrated suits being stroked (by God I hope not physically) by the sociopaths
(6) Our best and brightest women get sick of the crap and leave. Average salaries then, in spite of an initial good trend, definitely look strange. Simple discrimination though does not adequately demonstrate the totality of dysfunction
(7) maternity leave? Theoretically it doesnt hurt your career. In practice? Cant say its ever helped.
What organization - and Id assume Google is similar to mine - really wants introspection into its inner workings?