(Update: iOS app now available) Google's Drive file storage service is officially coming to iOS and Chrome OS, the company announced today at its second Google I/O keynote. Little has been announced about plans for the former, except that an app should launch for all iOS devices sometime today. One feature will be the ability to search through scanned documents, thanks to OCR technology; searching for "pyramid," for instance, should bring up images with the word in them even if the filename is completely unrelated.