While there isn't anything that can be proven to be nefarious about Google's actions, it does open up the possibility for posts calling the action into question. Google donated $25,000 to Common Sense Media for a party that the group was throwing in honor of the FTC's chairman's work for kids.
Normally this wouldn't be a big deal, but the fact they did it while they were undergoing an investigation by the FTC could bring unwanted or unwarranted scrutiny of the company's actions. This isn't the first Google has done something like this. Previously, Google reportedly spent $80,000 honoring FCC Chairman Julius Genachowski.
Of course, these actions could be coincidental. We'll likely never know for sure, but there will be plenty of people alleging that they were done to try and buy favor.