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

Source/bindings/tests/results/core/V8TestException.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 "V8TestException.h"
 
 #include "bindings/core/v8/ExceptionState.h"
@@ skipping 80 matching lines @@
     ALLOW_UNUSED_LOCAL(prototypeTemplate);
     static const V8DOMConfiguration::ConstantConfiguration V8TestExceptionConstants[] = {
         {"UNSIGNED_SHORT_CONSTANT", 1, 0, 0, V8DOMConfiguration::ConstantTypeUnsignedShort},
     };
     V8DOMConfiguration::installConstants(isolate, functionTemplate, prototypeTemplate, V8TestExceptionConstants, WTF_ARRAY_LENGTH(V8TestExceptionConstants));
     const V8DOMConfiguration::MethodConfiguration toStringMethodConfiguration = {
         "toString", TestExceptionV8Internal::toStringMethodCallback, 0, 0, V8DOMConfiguration::ExposedToAllScripts,
     };
     V8DOMConfiguration::installMethod(isolate, prototypeTemplate, defaultSignature, static_cast<v8::PropertyAttribute>(v8::DontDelete | v8::DontEnum), toStringMethodConfiguration);
 
+    prototypeTemplate->Set(v8::Symbol::GetToStringTag(isolate), v8AtomicString(isolate, "TestException"));
+
     // Custom toString template
     functionTemplate->Set(v8AtomicString(isolate, "toString"), V8PerIsolateData::from(isolate)->toStringTemplate());
 }
 
 v8::Local<v8::FunctionTemplate> V8TestException::domTemplate(v8::Isolate* isolate)
 {
     return V8DOMConfiguration::domClassTemplate(isolate, const_cast<WrapperTypeInfo*>(&wrapperTypeInfo), installV8TestExceptionTemplate);
 }
 
 bool V8TestException::hasInstance(v8::Local<v8::Value> v8Value, v8::Isolate* isolate)
@@ skipping 15 matching lines @@
 {
     scriptWrappable->toImpl<TestException>()->ref();
 }
 
 void V8TestException::derefObject(ScriptWrappable* scriptWrappable)
 {
     scriptWrappable->toImpl<TestException>()->deref();
 }
 
 } // namespace blink