According to google's documentation for the new analytics.js - you can set up multiple trackers, and send events to them by explicitly mentioning the trackers by name in separate send calls:
https://developers.google.com/analytics/devguides/collection/analyticsjs/advanced#multipletrackers
ga('create', 'UA-XXXX-Y');
ga('create', 'UA-12345-6', {'name': 'newTracker'}); // New tracker.
ga('send', 'pageview');
ga('newTracker.send', 'pageview'); // Send page view for new tracker.'
I'm wondering if there's a way to send one event to both trackers without having to write two separate send calls for every event, or even if there is a way to send using one send call and a comma delineated list of trackers or something. Anybody know?