Response time measurement in combination with WatiN

I'm looking for a tool that I could use in conjunction with WatiN that would allow me to more or less measure both the response time of an interaction and a file of the same interaction when combined with WatiN. Let's say I make a google request. This is great, we've all seen this example, but what if I want to see how long this request took, as well as what was loaded and how long it took. Does anyone know of any tools that can be used programmatically to do this? Of course, there are many tools like Charles , Fiddler 2 and Firebug that allow you to do this through an interface, but I would like to be able to automatically generate reports and for example based on this tool.