code: function load() {
          Inspector.Page.on("frameNavigated.CSSAgent", _onFrameNavigated);
          Inspector.CSS.on("styleSheetAdded.CSSAgent", _styleSheetAdded);
          Inspector.CSS.on("styleSheetRemoved.CSSAgent", _styleSheetRemoved);
  
          // getAllStyleSheets was deleted beginning with Chrome 34
          if (!_getAllStyleSheetsNotFound) {
              Inspector.Page.on("frameStoppedLoading.CSSAgent", _onFrameStoppedLoading);
          }
      }
docs: Initialize the agent