code: function injectScriptFile(url, rawText) {
    var filename = url;
    var lastSlash = url.lastIndexOf('/');
    if (lastSlash != -1) {
      filename = url.substr(lastSlash + 1);
    }
  
    var source = [
      '(function() {' + rawText + '})();',
      '// Web Tracing Framework injected file: ' + url,
      '//# sourceURL=x://wtf-injector/' + filename
    ].join('\n');
  
    // Setup script tag with the raw source.
    var script = document.createElement('script');
    script.type = 'text/javascript';
    script.text = source;
  
    // Add to page.
    injectScriptTag(script);
  }
docs: Injects a script file into the page.
  @param {string} url Script URL.
  @param {string} rawText Script raw text contents.