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() {

Thanks for reminding me. I think it's ok to keep desiredSize getter. waitForDesiredSize(n) or waitForDesiredSizeChange() could be added to give the same power as the pull() signal for underlyingSource to WritableStream users would be good I still think basically. But it doesn't need to be included in this PR, I guess. WDYT?

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