This one still sounds promising, if they could ever get Chromebook support working. There are other apps out there that could upload the code to the Arduino, I just wanted it to let me write and compile the code and I'd find a way to get it the Arduino, but still a no-go... 2 years and the popularity of this platform (Chromebooks) and still no support leaves me to think the developers at codebender.cc are not really in touch with the potential users out there.
johnwasser:
Try codebender.cc:"online development & collaboration platform for Arduino users, makers and engineers"
"Code: Awesome editor, fast cloud-based compiler, helpful error reporting. Code faster and easier
"Deploy: Connect your Arduino via USB, or program your Arduino Ethernet remotely over the network.
"Share: Share your work, search for existing projects and clone them, or collaborate with others.I have not tried it myself but it's probably your best bet if you want to do Arduino development with only a smartphone, tablet, or chromebook.