Chrome Debugger Multithreading

This is what multithreading means in the context of the Chrome Javascript debugger:

1023 Google Chrome Helper 81.9 5 111.9 MB  Intel 1025 Google Chrome Renderer 70.3 6 78.5 MB   Intel

So it makes use of multiple cores: 

This, when halted at a breakpoint. Well, winter's nearing, and it's probably going to be a cold one, so we may need the extra heating. And maybe Chrome 23 will fix this...right. 

I'd really like to know what it's doing with these cycles.