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

Source/bindings/tests/results/core/V8TestSpecialOperations.cpp

Index: Source/bindings/tests/results/core/V8TestSpecialOperations.cpp
diff --git a/Source/bindings/tests/results/core/V8TestSpecialOperations.cpp b/Source/bindings/tests/results/core/V8TestSpecialOperations.cpp
index 6217dd8d96ea4b4cc2a4b2c158a5d0c40d3c0c4e..5618d098f2e9a74dd254267c1de868f94dd5acb5 100644
--- a/Source/bindings/tests/results/core/V8TestSpecialOperations.cpp
+++ b/Source/bindings/tests/results/core/V8TestSpecialOperations.cpp
@@ -178,6 +178,10 @@ static void installV8TestSpecialOperationsTemplate(v8::Local<v8::FunctionTemplat
         functionTemplate->InstanceTemplate()->SetHandler(config);
     }
 
+    instanceTemplate->Set(v8::Symbol::GetToStringTag(isolate), v8AtomicString(isolate, "TestSpecialOperations"));
+
+    prototypeTemplate->Set(v8::Symbol::GetToStringTag(isolate), v8AtomicString(isolate, "TestSpecialOperationsPrototype"));
+
     // Custom toString template
     functionTemplate->Set(v8AtomicString(isolate, "toString"), V8PerIsolateData::from(isolate)->toStringTemplate());
 }