function sourceMappingComparator(a, b)
        {
            if (a.sourceLineNumber !== b.sourceLineNumber)
                return a.sourceLineNumber - b.sourceLineNumber;
            return a.sourceColumnNumber - b.sourceColumnNumber;
        }
@param {!WebInspector.SourceMap.Entry} a
@param {!WebInspector.SourceMap.Entry} b
@return {number}