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

Source/bindings/tests/results/V8TestInterface.h

Index: Source/bindings/tests/results/V8TestInterface.h
diff --git a/Source/bindings/tests/results/V8TestInterface.h b/Source/bindings/tests/results/V8TestInterface.h
index 6013dfa6077c0ac327571e29894d61a3926859ad..273327105ceb6b78952f8af92c5f675bd8af9de7 100644
--- a/Source/bindings/tests/results/V8TestInterface.h
+++ b/Source/bindings/tests/results/V8TestInterface.h
@@ -90,6 +90,21 @@ inline v8::Handle<v8::Value> toV8(TestInterface* impl, v8::Handle<v8::Object> cr
     return wrap(impl, creationContext, isolate);
 }
 
+inline UnsafePersistent<v8::Object> toV8Persistent(TestInterface* impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
+{
+    ASSERT(impl);
+
+    UnsafePersistent<v8::Object> wrapperPersistent = DOMDataStore::getWrapperPersistent<V8TestInterface>(impl, isolate);
+    if (LIKELY(!wrapperPersistent.isEmpty()))
+        return wrapperPersistent;
+
+    wrap(impl, creationContext, isolate);
+
+    wrapperPersistent = DOMDataStore::getWrapperPersistent<V8TestInterface>(impl, isolate);
+    ASSERT(!wrapperPersistent.isEmpty());
+    return wrapperPersistent;
+}
+
 template<typename CallbackInfo>
 inline void v8SetReturnValue(const CallbackInfo& callbackInfo, TestInterface* impl, v8::Handle<v8::Object> creationContext)
 {