First implementation of lazily cached accessor for DOM attributes.

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

 {% extends 'interface_base.cpp.tmpl' %}
 
 {##############################################################################}
 {% block indexed_property_getter %}
 {% if indexed_property_getter and not indexed_property_getter.is_custom %}
 {% set getter = indexed_property_getter %}
 static void indexedPropertyGetter(uint32_t index, const v8::PropertyCallbackInfo<v8::Value>& info) {
   {% if getter.is_raises_exception %}
   ExceptionState exceptionState(info.GetIsolate(), ExceptionState::kIndexedGetterContext, "{{interface_name}}");
   {% endif %}
@@ skipping 660 matching lines @@
        if not method.is_unforgeable else 'nullptr' %}
 {% set property_attribute =
        'static_cast<v8::PropertyAttribute>(%s)' %
        ' | '.join(method.property_attributes or ['v8::None']) %}
 {% set holder_check = 'V8DOMConfiguration::kCheckHolder' %}
 static const V8DOMConfiguration::AttributeConfiguration {{method.name}}OriginSafeAttributeConfiguration[] = {
 {% if method.is_per_world_bindings %}
 {% set getter_callback_for_main_world = '%sForMainWorld' % getter_callback %}
 {% set setter_callback_for_main_world = '%sForMainWorld' % setter_callback
        if not method.is_unforgeable else 'nullptr' %}
-    {"{{method.name}}", {{getter_callback_for_main_world}}, {{setter_callback_for_main_world}}, nullptr, &{{v8_class}}::wrapperTypeInfo, {{property_attribute}}, {{property_location(method)}}, {{holder_check}}, V8DOMConfiguration::MainWorld},
-    {"{{method.name}}", {{getter_callback}}, {{setter_callback}}, nullptr, &{{v8_class}}::wrapperTypeInfo, {{property_attribute}}, {{property_location(method)}}, {{holder_check}}, V8DOMConfiguration::NonMainWorlds}}
+    {"{{method.name}}", {{getter_callback_for_main_world}}, {{setter_callback_for_main_world}}, &{{v8_class}}::wrapperTypeInfo, {{property_attribute}}, {{property_location(method)}}, {{holder_check}}, V8DOMConfiguration::MainWorld},
+    {"{{method.name}}", {{getter_callback}}, {{setter_callback}}, &{{v8_class}}::wrapperTypeInfo, {{property_attribute}}, {{property_location(method)}}, {{holder_check}}, V8DOMConfiguration::NonMainWorlds}}
 {% else %}
-    {"{{method.name}}", {{getter_callback}}, {{setter_callback}}, nullptr, &{{v8_class}}::wrapperTypeInfo, {{property_attribute}}, {{property_location(method)}}, {{holder_check}}, V8DOMConfiguration::kAllWorlds}
+    {"{{method.name}}", {{getter_callback}}, {{setter_callback}}, &{{v8_class}}::wrapperTypeInfo, {{property_attribute}}, {{property_location(method)}}, {{holder_check}}, V8DOMConfiguration::kAllWorlds}
 {% endif %}
 };
 for (const auto& attributeConfig : {{method.name}}OriginSafeAttributeConfiguration)
   V8DOMConfiguration::InstallAttribute(isolate, world, {{instance_template}}, {{prototype_template}}, attributeConfig);
 {%- endmacro %}
 
 
 {##############################################################################}
 {% macro install_indexed_property_handler(target) %}
 {% set indexed_property_getter_callback =
@@ skipping 200 matching lines @@
   {{cpp_class}}* nativeValue = {{v8_class}}::toImplWithTypeCheck(isolate, value);
   if (!nativeValue) {
     exceptionState.ThrowTypeError(ExceptionMessages::FailedToConvertJSValue(
         "{{interface_name}}"));
   }
   return nativeValue;
 }
 
 {% endblock %}
 
-
 {##############################################################################}
 {% block partial_interface %}
 {% if has_partial_interface %}
 {% if needs_runtime_enabled_installer %}
 InstallRuntimeEnabledFunction {{v8_class}}::install{{v8_class}}RuntimeEnabledFunction =
     &{{v8_class}}::installRuntimeEnabledFeatures;
 {% endif %}
 
 InstallTemplateFunction {{v8_class}}::install{{v8_class}}TemplateFunction =
     &{{v8_class}}::install{{v8_class}}Template;
@@ skipping 18 matching lines @@
 }
 
 {% for method in methods if method.overloads and method.overloads.has_partial_overloads %}
 void {{v8_class}}::register{{method.name | blink_capitalize}}MethodForPartialInterface(void (*method)(const v8::FunctionCallbackInfo<v8::Value>&)) {
   {{cpp_class}}V8Internal::{{method.name}}MethodForPartialInterface = method;
 }
 
 {% endfor %}
 {% endif %}
 {% endblock %}