Create pre-frozen change records for Object.observe

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index 4df7af9902ca7ab4dc7d242c1703d565c2f29fc4..09a2251d27719ebf855c0b7a23f2cab6aa410421 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -13445,6 +13445,18 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_UnwrapGlobalProxy) {
 }
 
 
+RUNTIME_FUNCTION(MaybeObject*, Runtime_EnqueueChangeRecord) {
+  HandleScope scope(isolate);
+  ASSERT(args.length() == 4);
+  CONVERT_ARG_HANDLE_CHECKED(JSObject, object, 0);
+  CONVERT_ARG_HANDLE_CHECKED(String, type, 1);
+  CONVERT_ARG_HANDLE_CHECKED(String, name, 2);
+  Handle<Object> old_value = args.at<Object>(3);
+  JSObject::EnqueueChangeRecord(object, type, name, old_value);
+  return isolate->heap()->undefined_value();
+}
+
+
 // ----------------------------------------------------------------------------
 // Implementation of Runtime