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

Source/bindings/tests/results/core/V8TestInterfaceNode.cpp

Index: Source/bindings/tests/results/core/V8TestInterfaceNode.cpp
diff --git a/Source/bindings/tests/results/core/V8TestInterfaceNode.cpp b/Source/bindings/tests/results/core/V8TestInterfaceNode.cpp
index 441c1cf96df9e422d2e304d38a36ca5888e958c4..a8d4fc1683351c6d0fd0c4b8c6a7b48a610406de 100644
--- a/Source/bindings/tests/results/core/V8TestInterfaceNode.cpp
+++ b/Source/bindings/tests/results/core/V8TestInterfaceNode.cpp
@@ -349,6 +349,10 @@ static void installV8TestInterfaceNodeTemplate(v8::Local<v8::FunctionTemplate> f
     v8::Local<v8::ObjectTemplate> prototypeTemplate = functionTemplate->PrototypeTemplate();
     ALLOW_UNUSED_LOCAL(prototypeTemplate);
 
+    instanceTemplate->Set(v8::Symbol::GetToStringTag(isolate), v8AtomicString(isolate, "TestInterfaceNode"));
+
+    prototypeTemplate->Set(v8::Symbol::GetToStringTag(isolate), v8AtomicString(isolate, "TestInterfaceNodePrototype"));
+
     // Custom toString template
     functionTemplate->Set(v8AtomicString(isolate, "toString"), V8PerIsolateData::from(isolate)->toStringTemplate());
 }