Re: [streams] Change the model for ReadableStream to have async read() (#296)

> +      return Promise.reject(
> +        new TypeError('ReadableStreamReader.prototype.closed can only be used on a ReadableStreamReader'));
> +    }
> +
> +    return this._closedPromise;
> +  }
> +
> +  cancel(reason) {
> +    if (IsReadableStreamReader(this) === false) {
> +      return Promise.reject(
> +        new TypeError('ReadableStreamReader.prototype.cancel can only be used on a ReadableStreamReader'));
> +    }
> +
> +    if (this._ownerReadableStream === undefined) {
> +      return Promise.resolve(undefined);
> +    }

Return a promise rejected with the error if this was released when it got errored?

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