Re: [whatwg/streams] Standard text for TransformStream (#811)

ricea commented on this pull request.



> +</emu-alg>
+
+<h5 id="ts-default-source-pull" method for="TransformStreamDefaultSource">pull()</h5>
+
+<emu-alg>
+  1. Let _stream_ be *this*.[[ownerTransformStream]].
+  1. Assert: _stream_.[[backpressure]] is *true*.
+  1. Assert: _stream_.[[backpressureChangePromise]] is not *undefined*.
+  1. Perform ! TransformStreamSetBackpressure(_stream_, *false*).
+  1. Return _stream_.[[backpressureChangePromise]].
+</emu-alg>
+
+<h5 id="ts-default-source-cancel" method for="TransformStreamDefaultSource">cancel(<var>reason</var>)</h5>
+
+<emu-alg>
+  1. Perform ! TransformStreamError(*this*.[[ownerTransformStream]], _reason_).

I made factored out a new abstract op named "TransformStreamErrorWritableAndUnblockWrite". PTAL.

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