function createFrameElement(image)
        {
            var element = createElementWithClass("div", "frame");
            element.createChild("div", "thumbnail").appendChild(image);
            element.appendChild(WebInspector.Widget.createStyleElement("timeline/timelinePanel.css"));
            this._lastFrame = frame;
            this._lastElement = element;
            return element;
        }
@this {WebInspector.TimelineFilmStripOverview}
@param {!HTMLImageElement} image
@return {?Element}