Add Proces owner of socket and fix printing of non-network sockets

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 fadae3718604500bde0f9aed15569d753a6d90a3..4cdc7877030209e1443fe7074c7ca945b355fe10 100644
--- a/runtime/bin/service_object_patch.dart
+++ b/runtime/bin/service_object_patch.dart
@@ -19,9 +19,6 @@ String _serviceObjectHandler(List<String> paths,
                              List<String> keys,
                              List<String> values) {
   assert(keys.length == values.length);
-  badPath() {
-    throw "Invalid path '${paths.join("/")}'";
-  }
   if (paths.isEmpty) {
     return JSON.encode(_ioServiceObject());
   }
@@ -32,7 +29,7 @@ String _serviceObjectHandler(List<String> paths,
     i++;
   } while (i < paths.length && current is Map);
   if (current is! Function) {
-    badPath();
+    return JSON.encode(_makeServiceError('Unrecognized path'));
   }
   var query = new Map();
   for (int i = 0; i < keys.length; i++) {
@@ -41,6 +38,18 @@ String _serviceObjectHandler(List<String> paths,
   return JSON.encode(current(paths.sublist(i)));
 }
 
+Map _makeServiceError(String message, [String kind]) {
+  var error = {
+    'type': 'Error',
+    'id': '',
+    'message': message,
+  };
+  if (kind != null) {
+    error['kind'] = kind;
+  }
+  return error;
+}
+
 Map _ioServiceObject() {
   return {
     'id': 'io',