onload = () => {
            this.unlistenImageChange(onload);
            if (!this.initialOptions_) {
              return;
            }
            const imageSize = this.iconImage_.getSize();
            this.setScale(
              calculateScale(
                imageSize[0],
                imageSize[1],
                options.width,
                options.height,
              ),
            );
          }
Calculate the scale if width or height were given.