Re: [whatwg/streams] Align WritableStream structure with ReadableStream structure (#488)

>  
>      return this._closedPromise;
>    }
>  
> +  get desiredSize() {
> +    if (IsWritableStreamDefaultWriter(this) === false) {
> +      throw CreateWritableStreamDefaultWriterBrandCheckException('desiredSize');
> +    }
> +
> +    if (this._ownerWritableStream === undefined) {
> +      throw CreateWritableStreamDefaultWriterLockException('desiredSize');
> +    }
> +
> +    return WritableStreamDefaultWriterGetDesiredSize(this)
> +  }
> +
>    get ready() {

So, `waitForDesiredSize()` is equivalent to .. `waitForDesiredSize(1)`, and it would fulfill when the desired size becomes equal to or more than 1?

waitForDesiredSizeChange() can be implemented by
```
const current = writer.desiredSize;
writer.waitForDesiredSize(current + 1).then(...);
```
assuming there's no legitimate use of non integer values together with this waiting API.

> desiredSize >= highWaterMark.

nitpicking: you meant `HWM >= queueSize`?

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