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

Source/bindings/tests/results/core/V8TestInterfaceConstructor2.cpp

Index: Source/bindings/tests/results/core/V8TestInterfaceConstructor2.cpp
diff --git a/Source/bindings/tests/results/core/V8TestInterfaceConstructor2.cpp b/Source/bindings/tests/results/core/V8TestInterfaceConstructor2.cpp
index 11bee69ab1d60d90f2804467868e9e7eeaabe9ac..f386ea833a9fa4ca7a38ade9b8b4a305f3127219 100644
--- a/Source/bindings/tests/results/core/V8TestInterfaceConstructor2.cpp
+++ b/Source/bindings/tests/results/core/V8TestInterfaceConstructor2.cpp
@@ -221,6 +221,10 @@ static void installV8TestInterfaceConstructor2Template(v8::Local<v8::FunctionTem
     v8::Local<v8::ObjectTemplate> prototypeTemplate = functionTemplate->PrototypeTemplate();
     ALLOW_UNUSED_LOCAL(prototypeTemplate);
 
+    instanceTemplate->Set(v8::Symbol::GetToStringTag(isolate), v8AtomicString(isolate, "TestInterfaceConstructor2"));
+
+    prototypeTemplate->Set(v8::Symbol::GetToStringTag(isolate), v8AtomicString(isolate, "TestInterfaceConstructor2Prototype"));
+
     // Custom toString template
     functionTemplate->Set(v8AtomicString(isolate, "toString"), V8PerIsolateData::from(isolate)->toStringTemplate());
 }