Add Custom Named property getters for cssStyleDeclaration to determine the existence of a property.

Source/bindings/dart/scripts/templates/interface_cpp.template

 {% extends 'interface_base_cpp.template' %}
 
 
 {##############################################################################}
-{% macro generate_index_getter_resolver_body(dart_class, class_name, indexed_property_getter) %}
-  {% set resolver_string = resolver_indexed_name(class_name, 'getter', 'unsigned long') %}
-{# TODO(terry): Should change to 'Getter' for consistency, matches dart:html for indexed props and handle custom. #}
-if (argumentCount == 2 && name == "{{resolver_string}}") {
-    *autoSetupScope = true;
-    return {{dart_class}}Internal::indexedPropertyGetter;
-}
-{% endmacro %}
-
-
-{##############################################################################}
 {# Mangled Blink name used by resolver to map to static function.             #}
 {##############################################################################}
-{% macro resolver_indexed_name(class_name, name, argument) -%}
+{% macro resolver_callback_string(class_name, name, argument) -%}
 {% set name = '__' + name + '___' -%}
 {% set count = 1 -%}
 {{class_name}}_{{name}}Callback_RESOLVER_STRING_{{count}}_{{argument}}
 {%- endmacro %}
 
 
 {# TODO(terry): Implement setter and deleter too #}
 
 
 {##############################################################################}
@@ skipping 26 matching lines @@
     ASSERT_NOT_REACHED();
 }
 
 {% endif %}
 {# TODO(terry): Should handle custom index getter - none today. #}
 {% endblock %}
 
 
 {##############################################################################}
 {% macro generate_index_getter_resolver_body(dart_class, class_name, indexed_property_getter) %}
-  {% set resolver_string = resolver_indexed_name(class_name, 'getter', 'unsigned long') %}
+  {% set resolver_string = resolver_callback_string(class_name, 'getter', 'unsigned long') %}
 {# TODO(terry): Should change to 'Getter' for consistency, matches dart:html for indexed props and handle custom. #}
 if (argumentCount == 2 && name == "{{resolver_string}}") {
     *autoSetupScope = true;
     return {{dart_class}}Internal::indexedPropertyGetter;
 }
 {% endmacro %}
 
+{##############################################################################}
+{% macro generate_named_getter_resolver_body(dart_class, class_name, named_property_getter) %}
+  {% set resolver_string = resolver_callback_string(class_name, 'getter', 'DOMString') %}
+// TODO(terry/efortuna): v8 implements PropetyGetter, PropertyEnumerator, and
+// PropertyQuery. On the Dart side we currently only implement
+// propertyQuery. Implement the other two. 
+if (argumentCount == 2 && name == "{{resolver_string}}") {
+    *autoSetupScope = true;
+    return {{dart_class}}Internal::propertyQuery;
+}
+{% endmacro %}
 
 {##############################################################################}
 {% block indexed_property_getter_resolver %}
     {# TODO(terry): Support all indexed and named properties today only indexed getter is supported. #}
-    {# Resolver indexed/named properties #}
+    {# Resolver indexed properties #}
     {% if indexed_property_getter and not indexed_property_getter.is_custom %}
     {{generate_index_getter_resolver_body(dart_class, interface_name, indexed_property_getter) | indent(4)}}
     {% endif %}
 {% endblock %}
 
+{##############################################################################}
+{% block named_property_getter_resolver %}
+    {# Resolver named properties #}
+    {% if named_property_getter %}
+    {{generate_named_getter_resolver_body(dart_class, interface_name, named_property_getter) | indent(4)}}
+    {% endif %}
+{% endblock %}
+
 
 {##############################################################################}
 {% macro generate_symbolizer_indexed_property_getter_body(dart_class, interface_name) %}
-{% set resolver_string = resolver_indexed_name(interface_name, 'getter', 'unsigned long') %}
+{% set resolver_string = resolver_callback_string(interface_name, 'getter', 'unsigned long') %}
     if (nf == {{dart_class}}Internal::indexedPropertyGetter) {
         return reinterpret_cast<const uint8_t*>("{{resolver_string}}");
     }
 {% endmacro %}
 
-
+{##############################################################################}
+{% macro generate_symbolizer_named_property_getter_body(dart_class, interface_name) %}
+{% set resolver_string = resolver_callback_string(interface_name, 'getter', 'DOMString') %}
+    // TODO(terry/efortuna): v8 implements PropetyGetter, PropertyEnumerator, and
+    // PropertyQuery. On the Dart side we currently only implement
+    // propertyQuery. Implement the other two. 
+    if (nf == {{dart_class}}Internal::propertyQuery) {
+        return reinterpret_cast<const uint8_t*>("{{resolver_string}}");
+    }
+{% endmacro %}
 {##############################################################################}
 {% block generate_symbolizer_indexed_property_getter %}
 {% if indexed_property_getter and not indexed_property_getter.is_custom %}
   {{generate_symbolizer_indexed_property_getter_body(dart_class, interface_name)}}
 {% endif %}
 {% endblock %}
+
+{##############################################################################}
+{% block generate_symbolizer_named_property_getter %}
+{% if named_property_getter %}
+  {{generate_symbolizer_named_property_getter_body(dart_class, interface_name)}}
+{% endif %}
+{% endblock %}