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

Source/bindings/v8/DOMDataStore.h

Index: Source/bindings/v8/DOMDataStore.h
diff --git a/Source/bindings/v8/DOMDataStore.h b/Source/bindings/v8/DOMDataStore.h
index 64b040d3f2e9b062eca45b3968dc16d4299658bf..154d8d8d1ba09d407e5ce8afe1ac3631045edb46 100644
--- a/Source/bindings/v8/DOMDataStore.h
+++ b/Source/bindings/v8/DOMDataStore.h
@@ -101,6 +101,20 @@ public:
     }
 
     template<typename V8T, typename T>
+    static void setWrapperReference(const v8::Persistent<v8::Object>& parent, T* child, v8::Isolate* isolate)
+    {
+        if (ScriptWrappable::wrapperCanBeStoredInObject(child) && !canExistInWorker(child)) {
+            if (LIKELY(!DOMWrapperWorld::isolatedWorldsExist())) {
+                UnsafePersistent<v8::Object> unsafePersistent = ScriptWrappable::getUnsafeWrapperFromObject(child);
+                // Security: always guard against malicious tampering.
+                RELEASE_ASSERT_WITH_SECURITY_IMPLICATION(unsafePersistent.isEmpty() || unsafePersistent.value()->GetAlignedPointerFromInternalField(v8DOMWrapperObjectIndex) == V8T::toInternalPointer(child));
+                unsafePersistent.setReferenceFrom(parent, isolate);
+            }
+        }
+        current(isolate)->template setReference<V8T>(parent, child, isolate);
+    }
+
+    template<typename V8T, typename T>
     static void setWrapper(T* object, v8::Handle<v8::Object> wrapper, v8::Isolate* isolate, const WrapperConfiguration& configuration)
     {
         if (ScriptWrappable::wrapperCanBeStoredInObject(object) && !canExistInWorker(object)) {
@@ -127,6 +141,16 @@ public:
     }
 
     template<typename V8T, typename T>
+    inline void setReference(const v8::Persistent<v8::Object>& parent, T* child, v8::Isolate* isolate)
+    {
+        if (ScriptWrappable::wrapperCanBeStoredInObject(child) && m_type == MainWorld) {
+            ScriptWrappable::getUnsafeWrapperFromObject(child).setReferenceFrom(parent, isolate);
+            return;
+        }
+        m_wrapperMap.setReference(parent, V8T::toInternalPointer(child), isolate);
+    }
+
+    template<typename V8T, typename T>
     inline bool setReturnValueFrom(v8::ReturnValue<v8::Value> returnValue, T* object)
     {
         if (ScriptWrappable::wrapperCanBeStoredInObject(object) && m_type == MainWorld)