[DO NOT LAND] Set @@toStringTag for DOM object prototypes

Source/bindings/tests/results/core/V8TestInterfaceNamedConstructor2.cpp

Index: Source/bindings/tests/results/core/V8TestInterfaceNamedConstructor2.cpp
diff --git a/Source/bindings/tests/results/core/V8TestInterfaceNamedConstructor2.cpp b/Source/bindings/tests/results/core/V8TestInterfaceNamedConstructor2.cpp
index a19fbf95384febbc72f6c63801c9c3a4cdde0651..9ac9e6989ae0a62d3c5b677d5467860b34b1fbe7 100644
--- a/Source/bindings/tests/results/core/V8TestInterfaceNamedConstructor2.cpp
+++ b/Source/bindings/tests/results/core/V8TestInterfaceNamedConstructor2.cpp
@@ -73,7 +73,7 @@ v8::Local<v8::FunctionTemplate> V8TestInterfaceNamedConstructor2Constructor::dom
     result = v8::FunctionTemplate::New(isolate, V8TestInterfaceNamedConstructor2ConstructorCallback);
     v8::Local<v8::ObjectTemplate> instanceTemplate = result->InstanceTemplate();
     instanceTemplate->SetInternalFieldCount(V8TestInterfaceNamedConstructor2::internalFieldCount);
-    result->SetClassName(v8AtomicString(isolate, "TestInterfaceNamedConstructor2"));
+    instanceTemplate->Set(v8::Symbol::GetToStringTag(isolate), v8AtomicString(isolate, "TestInterfaceNamedConstructor2"));
     result->Inherit(V8TestInterfaceNamedConstructor2::domTemplate(isolate));
     data->setDOMTemplate(&domTemplateKey, result);
     return result;
@@ -93,6 +93,10 @@ static void installV8TestInterfaceNamedConstructor2Template(v8::Local<v8::Functi
     v8::Local<v8::ObjectTemplate> prototypeTemplate = functionTemplate->PrototypeTemplate();
     ALLOW_UNUSED_LOCAL(prototypeTemplate);
 
+    instanceTemplate->Set(v8::Symbol::GetToStringTag(isolate), v8AtomicString(isolate, "TestInterfaceNamedConstructor2"));
+
+    prototypeTemplate->Set(v8::Symbol::GetToStringTag(isolate), v8AtomicString(isolate, "TestInterfaceNamedConstructor2Prototype"));
+
     // Custom toString template
     functionTemplate->Set(v8AtomicString(isolate, "toString"), V8PerIsolateData::from(isolate)->toStringTemplate());
 }