Introduce ES6 iterator for DOM objects.

Source/bindings/templates/interface.cpp

 {% extends 'interface_base.cpp' %}
 
 
 {##############################################################################}
 {% macro attribute_configuration(attribute) %}
 {% set getter_callback =
        '%sV8Internal::%sAttributeGetterCallback' %
             (cpp_class, attribute.name)
        if not attribute.constructor_type else
        ('%sV8Internal::%sConstructorGetterCallback' %
@@ skipping 960 matching lines @@
            '%sV8Internal::namedPropertyQueryCallback' % cpp_class
            if named_property_getter.is_enumerable else '0' %}
     {% set named_property_deleter_callback =
            '%sV8Internal::namedPropertyDeleterCallback' % cpp_class
            if named_property_deleter else '0' %}
     {% set named_property_enumerator_callback =
            '%sV8Internal::namedPropertyEnumeratorCallback' % cpp_class
            if named_property_getter.is_enumerable else '0' %}
     functionTemplate->{{set_on_template}}()->SetNamedPropertyHandler({{named_property_getter_callback}}, {{named_property_setter_callback}}, {{named_property_query_callback}}, {{named_property_deleter_callback}}, {{named_property_enumerator_callback}});
     {% endif %}
+    {% if iterator_method %}
+    static const V8DOMConfiguration::SymbolKeyedMethodConfiguration symbolKeyedIteratorConfiguration = { v8::Symbol::GetIterator, {{cpp_class}}V8Internal::iteratorMethodCallback, 0, 0, V8DOMConfiguration::ExposedToAllScripts };
+    V8DOMConfiguration::installMethod(prototypeTemplate, defaultSignature, v8::DontDelete, symbolKeyedIteratorConfiguration, isolate);
+    {% endif %}
     {# End special operations #}
     {% if has_custom_legacy_call_as_function %}
     functionTemplate->InstanceTemplate()->SetCallAsFunctionHandler({{v8_class}}::legacyCallCustom);
     {% endif %}
     {% if interface_name == 'HTMLAllCollection' %}
     {# Needed for legacy support of document.all #}
     functionTemplate->InstanceTemplate()->MarkAsUndetectable();
     {% endif %}
     {% for method in custom_registration_methods %}
     {# install_custom_signature #}
@@ skipping 362 matching lines @@
 {% endif %}
 }
 
 template<>
 v8::Handle<v8::Value> toV8NoInline({{cpp_class}}* impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
 {
     return toV8(impl, creationContext, isolate);
 }
 
 {% endblock %}