Add [CEReactions] IDL attributes for Custom Elements V1

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

 {% from 'utilities.cpp' 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 313 matching lines @@
     {% if not attribute.has_setter_exception_state %}
     NonThrowableExceptionState exceptionState;
     {% endif %}
     {{declare_enum_validation_variable(attribute.enum_values) | indent}}
     if (!isValidEnum(cppValue, validValues, WTF_ARRAY_LENGTH(validValues), "{{attribute.enum_type}}", exceptionState)) {
         currentExecutionContext(info.GetIsolate())->addConsoleMessage(ConsoleMessage::create(JSMessageSource, WarningMessageLevel, exceptionState.message()));
         return;
     }
     {% endif %}
     {# Pre-set context #}
+    {% if attribute.is_ce_reactions %}
+    CEReactionsScope reactions;

[Yuki, 2016/06/06 06:13:56]

nit: I'd prefer cereactionsScope or ceReactionsScope or somethingScope because
it's a scope, not reactions.

[kojii, 2016/06/07 07:51:17]

Done.

+    {% endif %}
     {% if attribute.is_custom_element_callbacks or
           (attribute.is_reflect and
            not(attribute.idl_type == 'DOMString' and is_node)) %}
     {# Skip on compact node DOMString getters #}
     V0CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     {% endif %}
     {% if attribute.is_call_with_execution_context or
           attribute.is_setter_call_with_execution_context %}
     ExecutionContext* executionContext = currentExecutionContext(info.GetIsolate());
     {% endif %}
@@ skipping 162 matching lines @@
        setter_callback_for_main_world,
        wrapper_type_info,
        access_control,
        property_attribute,
        only_exposed_to_private_script,
        property_location(attribute),
        holder_check,
    ] %}
 {{'{'}}{{attribute_configuration_list | join(', ')}}{{'}'}}
 {%- endmacro %}