That's right -- Chrome uses the same process when there is a JS reference between the windows.
(In addition, Chrome will sometimes make windows/tabs share a process if there are a lot of tabs open, to save memory. There is a limit to the total number of render processes that Chrome will have.)
Cool, thanks. I am, not shockingly, curious how this works, now. Is it just a hinting mechanism, or can the rendering process of a tab/window change on the fly? What happens when you go to a new url in an opened tab? (I mean these more as things I'm now interested in. Maybe I'll get off my virtual butt and check the source. Granted, that source tree is less than casually approachable.)
(In addition, Chrome will sometimes make windows/tabs share a process if there are a lot of tabs open, to save memory. There is a limit to the total number of render processes that Chrome will have.)