There is now a Chromebook app to program LEGO Mindstorms. I have multiple kids collaborating on programs for FIRST LEGO League. Can they share the program between their Chromebooks? I don't see a way to import or export the programs in the app.
One of my students figured it out. I have highlighted the buttons in the picture below. The symbol with the arrow pointing to the box is import. The send symbol allows you to email or store the file on Google Drive.