All of those projects are related to Chrome/Chromium, and maybe P0 is a part of the same team, all under @laparisa? http://www.googblogs.com/why-attend-usenix-enigma-2/ here you can see her introducing Ben Hawkes.
I don't think that they're all related. Gerrit, for example, isn't part of Chrome; it was initially developed for Android, AFAIK. Nor is Monorail. I think Breakpad even predates Chrome.
But it's quite likely they all had their bug trackers on Google Code.
But it's quite likely they all had their bug trackers on Google Code.