function populateBackendNodeMap(nodesMap)
        {
            if (nodesMap) {
                for (var entry of nodesMap)
                    this._backendNodeIdToNode.set(entry[0], entry[1]);
            }
            callback();
        }
@this {WebInspector.LayerTreeBase}
@param {?Map<number, ?WebInspector.DOMNode>} nodesMap