[whatwg/streams] Define WritableStreamDefaultController.signal (#1132)

Define the property to signal abort to UnderlyingSink even
when it has a pending write or close operation.

Fixes #1015.
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You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/1132


-- Commit Summary --

  * Define WritableStreamDefaultController.signal

-- File Changes --

    M index.bs (26)
    M reference-implementation/lib/WritableStreamDefaultController-impl.js (4)
    M reference-implementation/lib/WritableStreamDefaultController.webidl (1)
    M reference-implementation/lib/abstract-ops/writable-streams.js (7)

-- Patch Links --

https://github.com/whatwg/streams/pull/1132.patch

https://github.com/whatwg/streams/pull/1132.diff


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