Accidentally filed a new issue at: https://breakpad.appspot.com/44903 ...so I'll just use that one instead.
We've been carrying this downstream in Mozilla, we're using it to generate minidumps for the browser/plugin processes when we detect hung plugins. The patches are by Chris Jones, originally written in: https://bugzilla.mozilla.org/show_bug.cgi?id=544936 https://bugzilla.mozilla.org/show_bug.cgi?id=555309