Stream isolates.

runtime/lib/isolate_patch.dart

Index: runtime/lib/isolate_patch.dart
diff --git a/runtime/lib/isolate_patch.dart b/runtime/lib/isolate_patch.dart
index 451b21956a11ccd260b6c49f2e25a36654157726..16319a903ddb79f542f61da86cab758d251ff61c 100644
--- a/runtime/lib/isolate_patch.dart
+++ b/runtime/lib/isolate_patch.dart
@@ -116,14 +116,15 @@ _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 spawnFunction(void topLevelFunction()) native "isolate_spawnFunction";
-
-patch spawnUri(String uri) native "isolate_spawnUri";
+  /* patch */ static spawnFunction(void topLevelFunction()) native "isolate_spawnFunction";
 
+  /* patch */ static spawnUri(String uri) native "isolate_spawnUri";
+}