Add HttpServerConnection to Observatory.

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 7f2e0d84855ad1ec5e920bb182b9d163e060cf20..348e3b23bbd42f2fc432e944b87cab1a2c9eb619 100644
--- a/runtime/bin/service_object_patch.dart
+++ b/runtime/bin/service_object_patch.dart
@@ -6,6 +6,7 @@
 final Map _servicePathMap = {
   'http' : {
     'servers' : _httpServersServiceObject,
+    'serverconnections' : _httpServerConnectionsServiceObject,
   },
   'sockets' : _socketsServiceObject,
   'websockets' : _webSocketsServiceObject,
@@ -87,6 +88,17 @@ Map _httpServersServiceObject(args) {
   };
 }
 
+Map _httpServerConnectionsServiceObject(args) {
+  if (args.length == 1) {
+    var connection = _HttpConnection._connections[int.parse(args.first)];
+    if (connection == null) {
+      return {};
+    }
+    return connection._toJSON(false);
+  }
+  return _makeServiceError("http/serverconnections can not be listed");
+}
+
 Map _socketsServiceObject(args) {
   if (args.length == 1) {
     var socket = _NativeSocket._sockets[int.parse(args.first)];