[whatwg/fetch] Add ReadableStreamOperations for ServiceWorker (#350)

This change adds some ReadableStream operations that are used in https://github.com/slightlyoff/ServiceWorker/pull/934.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/fetch/pull/350

-- Commit Summary --

  * wip
  * fix

-- File Changes --

    M Overview.html (24)
    M Overview.src.html (22)

-- Patch Links --

https://github.com/whatwg/fetch/pull/350.patch
https://github.com/whatwg/fetch/pull/350.diff

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