Add Socket ref to HttpServer.

runtime/bin/service_object_patch.dart

Index: runtime/bin/service_object_patch.dart
diff --git a/runtime/bin/service_object_patch.dart b/runtime/bin/service_object_patch.dart
index 2a0669419a4a9c5260015cf3f9b701278f3821d7..a7e104e61a0eafb8484a8b372295891dfac4b52f 100644
--- a/runtime/bin/service_object_patch.dart
+++ b/runtime/bin/service_object_patch.dart
@@ -5,8 +5,9 @@
 
 final Map _servicePathMap = {
   'http' : {
-    'servers' : _httpServersServiceObject
+    'servers' : _httpServersServiceObject,
   },
+  'socket' : _socketServiceObject,
   'file' : {
     'randomaccessfiles' : _randomAccessFilesServiceObject
   }
@@ -63,6 +64,22 @@ Map _httpServersServiceObject(args) {
   };
 }
 
+Map _socketServiceObject(args) {
+  if (args.length == 1) {
+    var socket = _NativeSocket._sockets[int.parse(args.first)];
+    if (socket == null) {
+      return {};
+    }
+    return socket._toJSON(false);
+  }
+  return {
+    'id': 'io/socket',
+    'type': 'SocketList',
+    'members': _NativeSocket._sockets.values
+        .map((socket) => socket._toJSON(true)).toList(),
+  };
+}
+
 Map _randomAccessFilesServiceObject(args) {
   if (args.length == 1) {
     var raf = _RandomAccessFile._files[int.parse(args.first)];