[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 b73b83fa6f82419be401865abfb977dda3d3c4ea..5af549342e065418557b098518b68cb891b61b1d 100644
--- a/Source/bindings/tests/results/core/V8TestInterfaceNode.cpp
+++ b/Source/bindings/tests/results/core/V8TestInterfaceNode.cpp
@@ -354,6 +354,8 @@ static void installV8TestInterfaceNodeTemplate(v8::Local<v8::FunctionTemplate> f
     v8::Local<v8::ObjectTemplate> prototypeTemplate = functionTemplate->PrototypeTemplate();
     ALLOW_UNUSED_LOCAL(prototypeTemplate);
 
+    prototypeTemplate->Set(v8::Symbol::GetToStringTag(isolate), v8AtomicString(isolate, "TestInterfaceNode"));
+
     // Custom toString template
     functionTemplate->Set(v8AtomicString(isolate, "toString"), V8PerIsolateData::from(isolate)->toStringTemplate());
 }