next_event_id_     31 chrome/browser/drive/event_logger.cc   history_.push_back(Event(next_event_id_, severity, what));
next_event_id_     32 chrome/browser/drive/event_logger.cc   ++next_event_id_;
next_event_id_     61 chrome/browser/drive/event_logger.h   int next_event_id_;  // guarded by lock_.