I'm not sure I understand what you want to do. The class and methods
you describe give you the metrics of an http request IF you're making
the request from your code using the HttpClient library yourself.
The browser on Android, or Steel for that matter, don't use the
HttpClient library, they use the native lib used by the webkit engine.
So, you can only measure traffic for requests you initiate form within
your code, the webkit traffic is transparent to the system.
Michael