[heycam/webidl] Dealing with argument types for callback functions (#692)

It seems there's two things that might be helpful here:

1. Assert that the specification algorithm provides the type(s) the callback is declared to take.
2. Find the spot where we need to convert specification values to IDL values as per #674.

See https://github.com/heycam/webidl/pull/690#issuecomment-474444648.



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https://github.com/heycam/webidl/issues/692