[w3c/ServiceWorker] Add API for postMessage with PostMessageOptions (#1344)

This is similar to the HTML changes in https://github.com/whatwg/html/pull/3800
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1344

-- Commit Summary --

  * Add API for postMessage with PostMessageOptions

-- File Changes --

    M docs/index.bs (24)
    M docs/index.html (4241)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1344.patch
https://github.com/w3c/ServiceWorker/pull/1344.diff

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https://github.com/w3c/ServiceWorker/pull/1344