Is there some kind of design document for the chrome.socket API<http://developer.chrome.com/apps/socket.html>?
If not, I'd like to propose the following extension in order to fully
support multicast:

Either several high-level wrapper functions:
chrome.socket.joinGroup(int socketId, string groupAddress, function
callback)
chrome.socket.leaveGroup(int socketId, string groupAddress, function
callback)
chrome.socket.blockSource(int socketId, string sourceAddress, function
callback)
chrome.socket.unblockSource(int socketId, string sourceAddress, function
callback)
chrome.socket.setAllowReuse(int socketId, bool allowReuse, function
callback)
...

Or one low-level function and several allowed socket options:
chrome.socket.setSocketOption(int socketId, int option, object
withWhateverParametersAreNeeded, function callback)
chrome.socket.MCAST_JOIN_GROUP
chrome.socket.MCAST_BLOCK_SOURCE
...

What do you think?

Mike Tsao