Run chrome with --remote-debugging-port=9222 | Open tab with your project and there devtools | Open new tab localhost:9222 and there to devtools of devtools prev tab | Inject in Console below code | Refresh devtools

Chrome 56 devtools source maps to workspace.js

SDK.TextSourceMap.prototype._parseSources = function(sourceMap) {
    var sourcesList = [];
    var sourceRoot = sourceMap.sourceRoot || '';
    if (sourceRoot && !sourceRoot.endsWith('/'))
        sourceRoot += '/';
    for (var i = 0; i < sourceMap.sources.length; ++i) {
        var href = sourceRoot + sourceMap.sources[i];
        var url = Common.ParsedURL.completeURL(this._sourceMappingURL, href) || href;
        var source = sourceMap.sourcesContent && sourceMap.sourcesContent[i];
        /*if (url === this._compiledURL && source)
            url += Common.UIString(' [sm]');*/
        this._sourceInfos.set(url, new SDK.TextSourceMap.SourceInfo(source,null));
        sourcesList.push(url);
    }
    sourceMap[SDK.TextSourceMap._sourcesListSymbol] = sourcesList;
}