[whatwg/streams] Port start() tests to web-platform-tests (#525)

Move tests relating to the WritableStream sink's stream() method to the
testharness.js framework.

Only syntactic and style changes have been made in this CL. There are
some minor logic simplifications, but no semantic changes.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/525

-- Commit Summary --

  * Port start() tests to web-platform-tests

-- File Changes --

    M reference-implementation/test/writable-stream.js (121)
    A reference-implementation/to-upstream-wpts/writable-streams/start.https.html (12)
    A reference-implementation/to-upstream-wpts/writable-streams/start.js (111)

-- Patch Links --

https://github.com/whatwg/streams/pull/525.patch
https://github.com/whatwg/streams/pull/525.diff

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