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() {

I guess we are somewhat re-debating (1) vs. (2) from #318. I guess I was thinking (2), but (1) is probably best. If we do (1) then I think you are right.

If we do (2) then waitForDesiredSize() is equivalent to waitForDesiredSize(HWM), i.e. queueSize <= 0. It waits for complete draining instead of just dipping below the HWM.

But yeah, let's do (1).

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