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

Source/bindings/tests/results/V8TestInterfaceImplementedAs.h

Index: Source/bindings/tests/results/V8TestInterfaceImplementedAs.h
diff --git a/Source/bindings/tests/results/V8TestInterfaceImplementedAs.h b/Source/bindings/tests/results/V8TestInterfaceImplementedAs.h
index 97b69294c502c15857652f97d18f6510d3106a89..885347d3d03aa2905281d1fba7026bcbd7d29c90 100644
--- a/Source/bindings/tests/results/V8TestInterfaceImplementedAs.h
+++ b/Source/bindings/tests/results/V8TestInterfaceImplementedAs.h
@@ -80,6 +80,21 @@ inline v8::Handle<v8::Value> toV8(RealClass* impl, v8::Handle<v8::Object> creati
     return wrap(impl, creationContext, isolate);
 }
 
+inline UnsafePersistent<v8::Object> toV8Persistent(RealClass* impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
+{
+    ASSERT(impl);
+
+    UnsafePersistent<v8::Object> wrapperPersistent = DOMDataStore::getWrapperPersistent<V8TestInterfaceImplementedAs>(impl, isolate);
+    if (LIKELY(!wrapperPersistent.isEmpty()))
+        return wrapperPersistent;
+
+    wrap(impl, creationContext, isolate);
+
+    wrapperPersistent = DOMDataStore::getWrapperPersistent<V8TestInterfaceImplementedAs>(impl, isolate);
+    ASSERT(!wrapperPersistent.isEmpty());
+    return wrapperPersistent;
+}
+
 template<typename CallbackInfo>
 inline void v8SetReturnValue(const CallbackInfo& callbackInfo, RealClass* impl, v8::Handle<v8::Object> creationContext)
 {