hi,
chromium is non-invasive. this means that you do not have to do anything to either Gem nor chromium to run Gem via a chromium-renderer. this means: it (should) work "out of the box"
i have tested chromium+Gem only on linux and it did work (but i admit that i didn't do a project with it: just rendering the Gem-window to 2 different screens)
the only issue was, that i had to explicitly preload the appfaker-lib; search the chromium-users and gem-dev archives for exact information (unfortunately i cannot do this personally, right now)
mfg.as.dr IOhannes