[heycam/webidl] Add the ability to construct a callback function (#328)

This helps move some of the heavy lifting into IDL, to avoid issues like https://github.com/whatwg/html/issues/2381.
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/328

-- Commit Summary --

  * Add the ability to construct a callback function

-- File Changes --

    M index.bs (50)

-- Patch Links --

https://github.com/heycam/webidl/pull/328.patch
https://github.com/heycam/webidl/pull/328.diff

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https://github.com/heycam/webidl/pull/328