I added two functions to the file, one adds the links to the code line numbers and the another one removes the link when the code line number isn't hovered. The link is combined from the file id and the line number, which should be enough to identify the row, which should be highlighted. The link is removed from the th element, when user hovers on another row. I'm not sure if this is ideal solution, but otherwise the link keeps flicking every time the cursor moves even a bit. 

The hackpad link -> (https://reviewboard.hackpad.com/Diffviewer-Line-Link-Project-Spec-jPwinbJva3E). 

Testing is done on my development server. There is also two screen shots below to demonstrate, how the link is presented.