[WIP] Be able to control when we cancel events. #1537
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As part of our event processing in MouseTracker, we cancel events sometimes. In some cases, we need to be able to turn that off and let the events go through to the browser. This patch is a work in progress to explore how to do that; it's specifically focused around being able to let the touch drag events through to the browser so it does its normal scrolling. I think something similar is needed to allow the browser to do its normal zooming for #1534.
@msalsbery Any thoughts?