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

Source/bindings/tests/results/core/V8TestInterface3.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file has been auto-generated by code_generator_v8.py. DO NOT MODIFY!
 
 #include "config.h"
 #include "V8TestInterface3.h"
 
 #include "bindings/core/v8/ExceptionState.h"
@@ skipping 307 matching lines @@
         };
         V8DOMConfiguration::installMethod(isolate, prototypeTemplate, defaultSignature, v8::None, entriesMethodConfiguration);
     }
     if (RuntimeEnabledFeatures::featureNameEnabled()) {
         const V8DOMConfiguration::MethodConfiguration forEachMethodConfiguration = {
             "forEach", TestInterface3V8Internal::forEachMethodCallback, 0, 1, V8DOMConfiguration::ExposedToAllScripts,
         };
         V8DOMConfiguration::installMethod(isolate, prototypeTemplate, defaultSignature, v8::None, forEachMethodConfiguration);
     }
 
+    prototypeTemplate->Set(v8::Symbol::GetToStringTag(isolate), v8AtomicString(isolate, "TestInterface3"));
+
     // Custom toString template
     functionTemplate->Set(v8AtomicString(isolate, "toString"), V8PerIsolateData::from(isolate)->toStringTemplate());
 }
 
 v8::Local<v8::FunctionTemplate> V8TestInterface3::domTemplate(v8::Isolate* isolate)
 {
     return V8DOMConfiguration::domClassTemplate(isolate, const_cast<WrapperTypeInfo*>(&wrapperTypeInfo), installV8TestInterface3Template);
 }
 
 bool V8TestInterface3::hasInstance(v8::Local<v8::Value> v8Value, v8::Isolate* isolate)
@@ skipping 15 matching lines @@
 {
     scriptWrappable->toImpl<TestInterface3>()->ref();
 }
 
 void V8TestInterface3::derefObject(ScriptWrappable* scriptWrappable)
 {
     scriptWrappable->toImpl<TestInterface3>()->deref();
 }
 
 } // namespace blink