bindings: Add validation for enum Sequence or Array

Source/bindings/templates/attributes.cpp

-{% from 'conversions.cpp' import v8_value_to_local_cpp_value %}
+{% from 'conversions.cpp' import declare_enum_validation_variable, v8_value_to_local_cpp_value %}
 
 
 {##############################################################################}
 {% macro attribute_getter(attribute, world_suffix) %}
 {% filter conditional(attribute.conditional_string) %}
 static void {{attribute.name}}AttributeGetter{{world_suffix}}(
 {%- if attribute.is_expose_js_accessors %}
 const v8::FunctionCallbackInfo<v8::Value>& info
 {%- else %}
 const v8::PropertyCallbackInfo<v8::Value>& info
@@ skipping 311 matching lines @@
     {# Type checking, possibly throw a TypeError, per:
        http://www.w3.org/TR/WebIDL/#es-type-mapping #}
     {% if attribute.has_type_checking_interface %}
     {# Type checking for interface types (if interface not implemented, throw
        TypeError), per http://www.w3.org/TR/WebIDL/#es-interface #}
     if (!cppValue{% if attribute.is_nullable %} && !isUndefinedOrNull(v8Value){% endif %}) {
         exceptionState.throwTypeError("The provided value is not of type '{{attribute.idl_type}}'.");
         exceptionState.throwIfNeeded();
         return;
     }
-    {% elif attribute.enum_validation_expression %}
+    {% elif attribute.enum_values %}
     {# Setter ignores invalid enum values:
        http://www.w3.org/TR/WebIDL/#idl-enums #}
-    String string = cppValue;
-    if (!({{attribute.enum_validation_expression}})) {
-        currentExecutionContext(info.GetIsolate())->addConsoleMessage(ConsoleMessage::create(JSMessageSource, WarningMessageLevel, "The provided value '" + string + "' is not a valid value of type '{{attribute.idl_type}}'."));
+    {{declare_enum_validation_variable(attribute.enum_values) | indent}}
+    if (!isValidEnum(cppValue, validValues, WTF_ARRAY_LENGTH(validValues))) {
+        currentExecutionContext(info.GetIsolate())->addConsoleMessage(ConsoleMessage::create(JSMessageSource, WarningMessageLevel, "The provided value '" + toCoreString(info.GetIsolate(), v8Value) + "' is not a valid value of type '{{attribute.idl_type}}'."));
         return;
     }
     {% endif %}
     {# Pre-set context #}
     {% 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 #}
     CustomElementProcessingStack::CallbackDeliveryScope deliveryScope;
     {% endif %}
@@ skipping 166 matching lines @@
        access_control,
        property_attribute,
        only_exposed_to_private_script,
    ] %}
 {% if not attribute.is_expose_js_accessors %}
 {% set attribute_configuration_list = attribute_configuration_list
                                     + [on_prototype] %}
 {% endif %}
 {{'{'}}{{attribute_configuration_list | join(', ')}}{{'}'}}
 {%- endmacro %}