[whatwg/streams] Has HasBackpressure operation to ReadableStream controllers (#767)

The TransformStream implementation currently looks at desiredSize to get an
approximation of whether there is backpressure on the readable side or
not. This is fragile and not really clean enough for standardisation.

Add an internal "HasBackpressure" polymorphic method to the
ReadableStream*Controller classes to permit TransformStream to determine
whether there is backpressure directly.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/767

-- Commit Summary --

  * Has HasBackpressure operation to ReadableStream controllers

-- File Changes --

    M index.bs (22)
    M reference-implementation/lib/readable-stream.js (12)
    M reference-implementation/lib/transform-stream.js (20)

-- Patch Links --

https://github.com/whatwg/streams/pull/767.patch
https://github.com/whatwg/streams/pull/767.diff

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