[w3c/ServiceWorker] Handle deserialization failures in postMessage() (#1130)

This is part of https://github.com/whatwg/html/pull/2530; see related links there for more information. Closes #1116.

It is on top of #1102, so that needs to be merged first. In addition, the HTML PR needs to be merged first so that the messageerror event type is actually defined somewhere; once that's done the Bikeshed HTML needs to be regenerated.

Also, this needs some tests, which I will write.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/ServiceWorker/pull/1130

-- Commit Summary --

  * Update structured serialization usage and postMessage algorithms
  * Handle deserialization failures in postMessage()

-- File Changes --

    M docs/index.bs (57)
    M docs/index.html (72)

-- Patch Links --

https://github.com/w3c/ServiceWorker/pull/1130.patch
https://github.com/w3c/ServiceWorker/pull/1130.diff

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