From https://github.com/WICG/EventListenerOptions/issues/27 it sounds like the DOM spec is likely to be updated to say that the 'passive' option isn't part of the "key" (i.e. calling addEventListener a 2nd time with the same args except different "passive" should not add a 2nd listener).
Once the semantics are agreed upon, we should do an intent-to-ship and update our impl. I think the compat risk should be very low. But if we can get it merged into M-51 that would be nice (to eliminate any risk of developer confusion / compat issues).
Comment 1 by dtapu...@chromium.org
, Apr 25 2016