function compareNumericField(field, a, b)
        {
            var nodeA = /** @type {!WebInspector.TimelineTreeView.GridNode} */ (a);
            var nodeB = /** @type {!WebInspector.TimelineTreeView.GridNode} */ (b);
            return nodeA._profileNode[field] - nodeB._profileNode[field];
        }
@param {string} field
@param {!WebInspector.DataGridNode} a
@param {!WebInspector.DataGridNode} b
@return {number}