Oilpan: Enable oilpan for callback classes

Source/bindings/templates/methods.cpp

 {##############################################################################}
 {% macro generate_method(method, world_suffix) %}
 {% filter conditional(method.conditional_string) %}
 static void {{method.name}}{{method.overload_index}}Method{{world_suffix}}(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     {# Local variables #}
     {% if method.has_exception_state %}
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "{{method.name}}", "{{interface_name}}", info.Holder(), info.GetIsolate());
     {% endif %}
     {# Overloaded methods have length checked during overload resolution #}
@@ skipping 66 matching lines @@
     {% else %}
     {{generate_argument(method, argument, world_suffix) | indent}}
     {% endif %}
     {% endfor %}
 }
 {% endmacro %}
 
 
 {######################################}
 {% macro generate_argument_var_declaration(argument) %}
-{% if argument.is_callback_interface %}
 {# FIXME: remove EventListener special case #}
 {% if argument.idl_type == 'EventListener' %}
 RefPtr<{{argument.idl_type}}> {{argument.name}}
 {%- else %}
-OwnPtrWillBeRawPtr<{{argument.idl_type}}> {{argument.name}} = nullptr;
+{{argument.cpp_type}} {{argument.name}}
 {%- endif %}{# argument.idl_type == 'EventListener' #}
-{%- else %}
-{{argument.cpp_type}} {{argument.name}}
-{%- endif %}
 {% endmacro %}
 
 
 {######################################}
 {% macro generate_argument(method, argument, world_suffix) %}
 {% if argument.is_optional and not argument.has_default and
       not argument.is_dictionary and
       not argument.is_callback_interface %}
 {# Optional arguments without a default value generate an early call with
    fewer arguments if they are omitted.
@@ skipping 26 matching lines @@
 {% if argument.idl_type == 'EventListener' %}
 {% if method.name == 'removeEventListener' or method.name == 'removeListener' %}
 {{argument.name}} = V8EventListenerList::getEventListener(ScriptState::current(info.GetIsolate()), info[{{argument.index}}], false, ListenerFindOnly);
 {% else %}{# method.name == 'addEventListener' #}
 {{argument.name}} = V8EventListenerList::getEventListener(ScriptState::current(info.GetIsolate()), info[{{argument.index}}], false, ListenerFindOrCreate);
 {% endif %}{# method.name #}
 {% else %}{# argument.idl_type == 'EventListener' #}
 {# Callback functions must be functions:
    http://www.w3.org/TR/WebIDL/#es-callback-function #}
 {% if argument.is_optional %}
-if (info.Length() > {{argument.index}} && !isUndefinedOrNull(info[{{argument.index}}])) {
+if (!isUndefinedOrNull(info[{{argument.index}}])) {
     if (!info[{{argument.index}}]->IsFunction()) {
         {{throw_type_error(method,
               '"The callback provided as parameter %s is not a function."' %
                   (argument.index + 1)) | indent(8)}}
         return;
     }
     {{argument.name}} = V8{{argument.idl_type}}::create(v8::Handle<v8::Function>::Cast(info[{{argument.index}}]), ScriptState::current(info.GetIsolate()));
+} else {
+    {{argument.name}} = nullptr;
 }
 {% else %}{# argument.is_optional #}
 if (info.Length() <= {{argument.index}} || !{% if argument.is_nullable %}(info[{{argument.index}}]->IsFunction() || info[{{argument.index}}]->IsNull()){% else %}info[{{argument.index}}]->IsFunction(){% endif %}) {
     {{throw_type_error(method,
           '"The callback provided as parameter %s is not a function."' %
               (argument.index + 1)) | indent }}
     return;
 }
 {{argument.name}} = {% if argument.is_nullable %}info[{{argument.index}}]->IsNull() ? nullptr : {% endif %}V8{{argument.idl_type}}::create(v8::Handle<v8::Function>::Cast(info[{{argument.index}}]), ScriptState::current(info.GetIsolate()));
 {% endif %}{# argument.is_optional #}
@@ skipping 476 matching lines @@
   if method.is_per_world_bindings else '0' %}
 {% set property_attribute =
   'static_cast<v8::PropertyAttribute>(%s)' % ' | '.join(method.property_attributes)
   if method.property_attributes else 'v8::None' %}
 {% set only_exposed_to_private_script = 'V8DOMConfiguration::OnlyExposedToPrivateScript' if method.only_exposed_to_private_script else 'V8DOMConfiguration::ExposedToAllScripts' %}
 static const V8DOMConfiguration::MethodConfiguration {{method.name}}MethodConfiguration = {
     "{{method.name}}", {{method_callback}}, {{method_callback_for_main_world}}, {{method.length}}, {{only_exposed_to_private_script}},
 };
 V8DOMConfiguration::installMethod({{method.function_template}}, {{method.signature}}, {{property_attribute}}, {{method.name}}MethodConfiguration, isolate);
 {%- endmacro %}