Hello,
I see the last message on this issue is from September 2020 and screen sharing still doesn't seem to work with the latest stable version (90.0.4430.212). I am not well versed in the chromium project, but is this "Hangout Services Extension" something that could be turned on or off at the flags level (chrome://flags/) - or some other browser level, rather than the compile level? If not, is it something that could be asked to the chromium project? Regards