bindings: Add C++ versions of WebIDL types and generalize NativeValueTraits.

third_party/WebKit/Source/bindings/templates/interface_base.cpp.tmpl

 {% filter format_blink_cpp_source_code %}
 
 {% include 'copyright_block.txt' %}
 #include "{{v8_class_or_partial}}.h"
 
 {% for filename in cpp_includes if filename != '%s.h' % cpp_class_or_partial %}
 #include "{{filename}}"
 {% endfor %}
 
 namespace blink {
@@ skipping 680 matching lines @@
 {% endif %}
 
 {% endfor %}{# feature #}
 {% endblock %}
 {##############################################################################}
 {% block get_dom_template %}{% endblock %}
 {% block get_dom_template_for_named_properties_object %}{% endblock %}
 {% block has_instance %}{% endblock %}
 {% block to_impl %}{% endblock %}
 {% block to_impl_with_type_check %}{% endblock %}
+{% block native_value_traits %}{% endblock %}
 {##############################################################################}
 {% block prepare_prototype_and_interface_object %}
 {% from 'attributes.cpp.tmpl' import install_conditionally_enabled_attributes_on_prototype with context %}
 {% from 'methods.cpp.tmpl' import install_conditionally_enabled_methods with context %}
 {% if prepare_prototype_and_interface_object_func %}
 void {{v8_class_or_partial}}::preparePrototypeAndInterfaceObject(v8::Local<v8::Context> context, const DOMWrapperWorld& world, v8::Local<v8::Object> prototypeObject, v8::Local<v8::Function> interfaceObject, v8::Local<v8::FunctionTemplate> interfaceTemplate) {
   {% if is_partial %}
   {{v8_class}}::preparePrototypeAndInterfaceObject(context, world, prototypeObject, interfaceObject, interfaceTemplate);
   {% endif %}
 
@@ skipping 26 matching lines @@
 {% endif %}
 }
 {% endif %}
 
 {% endblock %}
 {##############################################################################}
 {% block partial_interface %}{% endblock %}
 }  // namespace blink
 
 {% endfilter %}{# format_blink_cpp_source_code #}