[whatwg/streams] Specify WritableStream.[[Transfer]] (#629)

The only trouble is that, currently, `writer.write()` is specified to indirectly invoke `strategy.size()` synchronously, which is bad if `strategy.size` runs in a different JS context entirely.

Cf. #623.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/629

-- Commit Summary --

  * implement WritableStream.[[Transfer]] in js

-- File Changes --

    M reference-implementation/lib/writable-stream.js (70)

-- Patch Links --

https://github.com/whatwg/streams/pull/629.patch
https://github.com/whatwg/streams/pull/629.diff

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