Re: [whatwg/streams] What is the expected behaviour of .pipeThrough()? (#765)

@domenic 

Browsing https://github.com/whatwg/streams/blob/1e13713cc8671fcd029f0a34b6b4af55962f73af/demos/transforms/parse-json.js revealed solution, that is to pass transformed value to `.enqueue()` method of `TransformStreamDefaultController`

```
const {readable, writable} = ts = new TransformStream({
  transform(chunk, c) {
    console.log(chunk, c); 
    c.enqueue(chunk.map(c => c * 10)); // {"value":[10,20,30],"done":false}
  }
});
```
which yields `{"value":[10,20,30],"done":false}` at `.then()` chained to `.read()` of returned `ReadableStream` of `.pipeThrough()`.

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