[Bindings] Unify a template block 'prepare_prototype_and_interface_object'

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

 {% from 'utilities.cpp.tmpl' import declare_enum_validation_variable, v8_value_to_local_cpp_value %}
 
 {##############################################################################}
 {% macro attribute_getter(attribute, world_suffix) %}
 static void {{attribute.name}}AttributeGetter{{world_suffix}}(
 {%- if attribute.is_data_type_property %}
 const v8::PropertyCallbackInfo<v8::Value>& info
 {%- else %}
 const v8::FunctionCallbackInfo<v8::Value>& info
 {%- endif %}) {
@@ skipping 486 matching lines @@
        getter_callback_for_main_world,
        setter_callback_for_main_world,
        cached_accessor_callback,
        wrapper_type_info,
        property_attribute,
        property_location(attribute),
        holder_check,
    ] %}
 {{'{'}}{{attribute_configuration_list | join(', ')}}{{'}'}}
 {%- endmacro %}
+
+{##############################################################################}
+{% macro install_conditionally_enabled_attributes_on_prototype() %}
+ExecutionContext* executionContext = toExecutionContext(context);
+v8::Local<v8::Signature> signature = v8::Signature::New(isolate, interfaceTemplate);
+{% for attribute in attributes if (attribute.exposed_test or attribute.secure_context_test) and attribute.on_prototype %}
+{% filter exposed(attribute.exposed_test) %}
+{% filter secure_context(attribute.secure_context_test) %}
+{% filter runtime_enabled(attribute.runtime_enabled_feature_name) %}
+const V8DOMConfiguration::AccessorConfiguration accessorConfiguration = {{attribute_configuration(attribute)}};
+V8DOMConfiguration::installAccessor(isolate, world, v8::Local<v8::Object>(), prototypeObject, interfaceObject, signature, accessorConfiguration);
+{% endfilter %}{# runtime_enabled #}
+{% endfilter %}{# secure_context #}
+{% endfilter %}{# exposed #}
+{% endfor %}
+{% endmacro %}