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

Source/bindings/core/v8/V8DOMConfiguration.cpp

Index: Source/bindings/core/v8/V8DOMConfiguration.cpp
diff --git a/Source/bindings/core/v8/V8DOMConfiguration.cpp b/Source/bindings/core/v8/V8DOMConfiguration.cpp
index ad487a8acca735300a0ec4bc8b706eb710bc32e7..216108e4313d9f349a92dcdf2e78b9a20fbd549f 100644
--- a/Source/bindings/core/v8/V8DOMConfiguration.cpp
+++ b/Source/bindings/core/v8/V8DOMConfiguration.cpp
@@ -256,6 +256,7 @@ v8::Local<v8::Signature> V8DOMConfiguration::installDOMClassTemplate(v8::Isolate
     const AccessorConfiguration* accessors, size_t accessorCount,
     const MethodConfiguration* callbacks, size_t callbackCount)
 {
+    // This defines the constructor function's "name" property.
     functionDescriptor->SetClassName(v8AtomicString(isolate, interfaceName));
     v8::Local<v8::ObjectTemplate> instanceTemplate = functionDescriptor->InstanceTemplate();
     v8::Local<v8::ObjectTemplate> prototypeTemplate = functionDescriptor->PrototypeTemplate();