Stream isolates.

runtime/lib/isolate_patch.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 patch class ReceivePort {
   /* patch */ factory ReceivePort() {
     return new _ReceivePortImpl();
   }
 }
 
@@ skipping 98 matching lines @@
   static _sendInternal(int sendId, int replyId, var message)
       native "SendPortImpl_sendInternal_";
 
   final int _id;
 }
 
 _getPortInternal() native "isolate_getPortInternal";
 
 ReceivePort _portInternal;
 
-patch ReceivePort get port {
-  if (_portInternal == null) {
-    _portInternal = _getPortInternal();
+patch class _Isolate {
+  /* patch */ static ReceivePort get port {
+    if (_portInternal == null) {
+      _portInternal = _getPortInternal();
+    }
+    return _portInternal;
   }
-  return _portInternal;
+
+  /* patch */ static spawnFunction(void topLevelFunction()) native "isolate_spawnFunction";
+
+  /* patch */ static spawnUri(String uri) native "isolate_spawnUri";
 }
-
-patch spawnFunction(void topLevelFunction()) native "isolate_spawnFunction";
-
-patch spawnUri(String uri) native "isolate_spawnUri";
-