I just recently bought a Samsung Google Chromebook. Before I bought the laptop, I knew that Chrome OS could not support Arduino code development. If I knew more about advanced computer programming, I would consider making the app. However, I hope the large and ambitious Arduino community will make an app soon. As some of the other users have mentioned, one could use a remote desktop application to run the Arduinio IDE from a Chromebook, but I do not see that being very useful.