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

Source/bindings/tests/results/core/V8TestInterfaceDocument.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 "V8TestInterfaceDocument.h"
 
 #include "bindings/core/v8/ExceptionState.h"
@@ skipping 26 matching lines @@
     v8::Local<v8::Signature> defaultSignature;
     defaultSignature = V8DOMConfiguration::installDOMClassTemplate(isolate, functionTemplate, "TestInterfaceDocument", V8Document::domTemplate(isolate), V8TestInterfaceDocument::internalFieldCount,
         0, 0,
         0, 0,
         0, 0);
     v8::Local<v8::ObjectTemplate> instanceTemplate = functionTemplate->InstanceTemplate();
     ALLOW_UNUSED_LOCAL(instanceTemplate);
     v8::Local<v8::ObjectTemplate> prototypeTemplate = functionTemplate->PrototypeTemplate();
     ALLOW_UNUSED_LOCAL(prototypeTemplate);
 
+    prototypeTemplate->Set(v8::Symbol::GetToStringTag(isolate), v8AtomicString(isolate, "TestInterfaceDocument"));
+
     // Custom toString template
     functionTemplate->Set(v8AtomicString(isolate, "toString"), V8PerIsolateData::from(isolate)->toStringTemplate());
 }
 
 v8::Local<v8::FunctionTemplate> V8TestInterfaceDocument::domTemplate(v8::Isolate* isolate)
 {
     return V8DOMConfiguration::domClassTemplate(isolate, const_cast<WrapperTypeInfo*>(&wrapperTypeInfo), installV8TestInterfaceDocumentTemplate);
 }
 
 bool V8TestInterfaceDocument::hasInstance(v8::Local<v8::Value> v8Value, v8::Isolate* isolate)
@@ skipping 19 matching lines @@
 }
 
 void V8TestInterfaceDocument::derefObject(ScriptWrappable* scriptWrappable)
 {
 #if !ENABLE(OILPAN)
     scriptWrappable->toImpl<TestInterfaceDocument>()->deref();
 #endif
 }
 
 } // namespace blink