It's worth noting that all of the APIs you mention in (1) are only available to Chrome packaged apps. These are essentially the .exe files of Chrome OS. They ca

It's worth noting that all of the APIs you mention in (1) are only available to Chrome packaged apps. These are essentially the .exe files of Chrome OS. They cannot be hosted on webpages (otherwise Google calls them hosted apps, and they can't access these APIs) and can only be distributed and accessed via the Chrome Web Store. It's essentially not much different from Windows having Windows-specific APIs for downloadable programs. "Chrome Packaged Apps" are the downloadable programs of Chrome OS.