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

Source/bindings/templates/interface_base.cpp

Index: Source/bindings/templates/interface_base.cpp
diff --git a/Source/bindings/templates/interface_base.cpp b/Source/bindings/templates/interface_base.cpp
index b622ef728e2f2bc503806c1e4012291fa8886220..e73c08c33442ac75e9506be1a614223ae606737a 100644
--- a/Source/bindings/templates/interface_base.cpp
+++ b/Source/bindings/templates/interface_base.cpp
@@ -468,6 +468,18 @@ static void install{{v8_class}}Template(v8::Local<v8::FunctionTemplate> function
     functionTemplate->SetHiddenPrototype(true);
     {% endif %}
 
+    {# WebIDL 4.7:
+                The class string of a platform object that implements
+                one or more interfaces must be the identifier of the
+                primary interface of the platform object. #}
+    instanceTemplate->Set(v8::Symbol::GetToStringTag(isolate), v8AtomicString(isolate, "{{interface_name}}"));

[haraken, 2015/03/19 23:30:56]

Just to confirm: What is the interface_name of WebKitTransitionEvent?
WebKitTransitionEvent is an alias of TransitionEvent, and I'm curious how the
alias is handled.

https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit...

+
+    {# WebIDL 4.5.4:
+                The class string of an interface prototype object is the
+                concatenation of the interface’s identifier and the string
+                "Prototype". #}
+    prototypeTemplate->Set(v8::Symbol::GetToStringTag(isolate), v8AtomicString(isolate, "{{interface_name}}Prototype"));
+
     // Custom toString template
     functionTemplate->Set(v8AtomicString(isolate, "toString"), V8PerIsolateData::from(isolate)->toStringTemplate());
     {% endif %}