Introduce ES6 iterator for DOM objects.

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 68a7cc5d3b873c49082a76d81c027af21e7a3e38..4a93e3a4dfe4fb3dd3e00180ecdbf7daca509281 100644
--- a/Source/bindings/templates/interface_base.cpp
+++ b/Source/bindings/templates/interface_base.cpp
@@ -109,6 +109,10 @@ template <typename T> void V8_USE(T) { }
 {% endfor %}
 {% endif %}
 {% endfor %}
+{% if iterator_method %}
+{{generate_method(iterator_method)}}
+{{method_callback(iterator_method)}}
+{% endif %}
 {% block origin_safe_method_setter %}{% endblock %}
 {# Constructors #}
 {% for constructor in constructors %}