在Polymer元素之间传递数组和/或对象数据

I'm setting up a custom google maps Polymer element called "locator-map" that uses polymer-jsonp to grab data from a google spreadsheet, take the response, and send it off to a custom "google-map" element to plot the markers on the map. I can't seem to figure out how to actually inject the data coming back from the polymer-jsonp element into my google-map element so that it can use it to construct the markers.I'm setting up a custom google maps Polymer ele