It would be cool if Sketchup were made in the browser!
I was thinking through how this might work using WebGL. If could get a ruby --> asm.js compiler, that might take you pretty near to a browser version that runs near (1/2?) speed of desktop. Of course your plugins would need compilation as well.
Cool thanks for thinking about it. https://www.onshape.com/ has put a
pretty powerful CAD program in the browser but its not very consumer
Check it out: my.SketchUp is SketchUp in a web browser: my.sketchup.com
Hey thats pretty cool, I hope it works.