})`;

      this.image_.width = naturalWidth * this.zoomScaleValue_;
      this.image_.height = naturalHeight * this.zoomScaleValue_;
    },

    trackMouse_() {
      this.mouseModeSelector_ = document.createElement(
          'tr-ui-b-mouse-mode-selector');
      this.mouseModeSelector_.targetElement = this.imageContainer_;
      Polymer.dom(this.imageContainer_).appendChild(this.mouseModeSelector_);

      this.mouseModeSelector_.supportedModeMask =
          tr.ui.b.MOUSE_SELECTOR_MODE.ZOOM;
      this.