Reland: Reland: Implement new Blink IDL attribute [SetReference]

Source/bindings/tests/results/V8TestExtendedEvent.h

Index: Source/bindings/tests/results/V8TestExtendedEvent.h
diff --git a/Source/bindings/tests/results/V8TestExtendedEvent.h b/Source/bindings/tests/results/V8TestExtendedEvent.h
index fc8cf0242ee6952c467dae85a0dbbea729af3f8d..ae2202c8da27d18ee90bc616858b02d3c358405b 100644
--- a/Source/bindings/tests/results/V8TestExtendedEvent.h
+++ b/Source/bindings/tests/results/V8TestExtendedEvent.h
@@ -84,6 +84,21 @@ inline v8::Handle<v8::Value> toV8(Event* impl, v8::Handle<v8::Object> creationCo
     return wrap(impl, creationContext, isolate);
 }
 
+inline UnsafePersistent<v8::Object> toV8Persistent(Event* impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
+{
+    ASSERT(impl);
+
+    UnsafePersistent<v8::Object> wrapperPersistent = DOMDataStore::getWrapperPersistent<V8TestExtendedEvent>(impl, isolate);
+    if (LIKELY(!wrapperPersistent.isEmpty()))
+        return wrapperPersistent;
+
+    wrap(impl, creationContext, isolate);
+
+    wrapperPersistent = DOMDataStore::getWrapperPersistent<V8TestExtendedEvent>(impl, isolate);
+    ASSERT(!wrapperPersistent.isEmpty());
+    return wrapperPersistent;
+}
+
 template<typename CallbackInfo>
 inline void v8SetReturnValue(const CallbackInfo& callbackInfo, Event* impl, v8::Handle<v8::Object> creationContext)
 {