[whatwg/streams] Add WritableStream.close() (#1011)

Fixes #1007
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/1011

-- Commit Summary --

  * Add WritableStreamClose abstract operation
  * Add WritableStream.close()
  * Update WPT (WIP)

-- File Changes --

    M index.bs (55)
    M reference-implementation/lib/writable-stream.js (75)
    M reference-implementation/web-platform-tests (2)

-- Patch Links --

https://github.com/whatwg/streams/pull/1011.patch
https://github.com/whatwg/streams/pull/1011.diff

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