(IANAL.) Gender discrimination, and sexual harassment in the workplace are against the law in California. I believe the law also protects against retaliation for claims of violations of these things. This is hardly "bringing politics to work".
These people, regardless of what they thought they were doing, weren't blowing the whistle on anything because they failed to highlight any illegal behaviour.
Remember that Google is the company that initiated a massive review of pay to try and uncover this supposedly widespread sexist underpaying of women. It discovered it was underpaying men and had to adjust men's pay upwards.
Likewise their big walkout was triggered by the fact that Andy Rubin was fired, but also paid money, after a woman he was in a consensual relationship with discovered he was cheating and made an (unverifiable) accusation against him. But this isn't Google tolerating sexual harassment in any legal sense of the term.
So what makes you think the law has anything to do with their protests?