Fec 1125

I thought the idea was to list these properties on the adSequenceProxy object, and avoid having to pass them around note how the freewheel plugin did it: https://github.com/kaltura/mwEmbed/blob/master/modules/FreeWheel/resources/mw.FreeWheelController.js#L299

Passing a list of arguments is not as maintainable as updating an object designated for this purpose, because what we need may change over time.