function onGotObject(result)
        {
            if (!result)
                return;
            var viewport = result["device_viewport_size"];
            var tiles = result["active_tiles"];
            var rootLayer = result["active_tree"]["root_layer"];
            var layerTree = new WebInspector.TracingLayerTree(this._target);
            layerTree.setViewportSize(viewport);
            layerTree.setTiles(tiles);
            layerTree.setLayers(rootLayer, callback.bind(null, layerTree));
        }
@this {WebInspector.DeferredTracingLayerTree}
@param {?Object} result