[whatwg/dom] Editorial: add "add an event listener" hook (#596)

This hook ensures that any special casing in addEventListener() is shared with event handler attributes.

Helps with https://github.com/w3c/ServiceWorker/issues/1004.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/596

-- Commit Summary --

  * Editorial: add "add an event listener" hook

-- File Changes --

    M dom.bs (18)

-- Patch Links --

https://github.com/whatwg/dom/pull/596.patch
https://github.com/whatwg/dom/pull/596.diff

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