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

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

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // WARNING: Do not edit - generated code.
 
 #include "config.h"
 {% filter conditional(conditional_string) %}
 #include "DartWebkitClassIds.h"
 #include "{{dart_class}}.h"
@@ skipping 71 matching lines @@
     {# Resolver Methods #}
     {% from 'methods_cpp.template' import generate_resolver_body with context %}
     {% for method in methods if not method.suppressed %}
 {{generate_resolver_body(dart_class, interface_name, method) | indent(4)}}
     {% endfor %}
     {# Special operations (methods) #}
     {# TODO(terry): Only emit indexed getter for DataTransferItemList; emit for interfaces. #}
     {% if dart_class == 'DartDataTransferItemList' %}
       {% block indexed_property_getter_resolver %}{% endblock %}
     {% endif %}
+    {% if dart_class == 'DartCSSStyleDeclaration' %}
+      {% block named_property_getter_resolver %}{% endblock %}
+    {% endif %}
     return 0;
 }
 
 const uint8_t* {{dart_class}}::symbolizer(Dart_NativeFunction nf)
 {
     {% from 'methods_cpp.template' import generate_symbolizer_constructor with context %}
     {% for constructor in constructors %}
 {{generate_symbolizer_constructor(dart_class, interface_name, constructor) | indent(4)}}
     {% endfor %}
     {% for constructor in custom_constructors %}
 {{generate_symbolizer_constructor(dart_class, interface_name, constructor) | indent(4)}}
     {% endfor %}
     {% if named_constructor %}
 {{generate_symbolizer_constructor(dart_class, interface_name, named_constructor) | indent(4)}}
     {% endif %}
     {% from 'attributes_cpp.template' import generate_attribute_symbolizer_body %}
     {% for attribute in attributes %}
 {{generate_attribute_symbolizer_body(dart_class, interface_name, attribute) | indent(4)}}
     {% endfor %}
     {% from 'methods_cpp.template' import generate_symbolizer_body with context %}
     {% for method in methods if not method.suppressed %}
 {{generate_symbolizer_body(dart_class, interface_name, method) | indent(4)}}
     {% endfor %}
+    {% if dart_class == 'DartCSSStyleDeclaration' %}
+{% block generate_symbolizer_named_property_getter %}{% endblock %}
+    {% endif %}
 {% block generate_symbolizer_indexed_property_getter %}{% endblock %}
     return 0;
 }
 
 }  // namespace WebCore
 
 {% endfilter %}