Use enum BinaryType for WebSocket.binaryType, instead of DOMString

Source/bindings/templates/attributes.cpp

 {##############################################################################}
 {% 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
 {%- endif %})
 {
@@ skipping 244 matching lines @@
        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 %}
     {# Setter ignores invalid enum values:
        http://www.w3.org/TR/WebIDL/#idl-enums #}
     String string = cppValue;
-    if (!({{attribute.enum_validation_expression}}))
+    if (!({{attribute.enum_validation_expression}})) {
+        currentExecutionContext(info.GetIsolate())->addConsoleMessage(ConsoleMessage::create(JSMessageSource, ErrorMessageLevel, "The provided value '"+string+"' is not a valid value of type '{{attribute.idl_type}}'."));

[Nils Barth (inactive), 2015/02/11 18:58:45]

Could you do this in a separate CL, since it affects *ALL* enums?

         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 %}
     {% if attribute.is_call_with_execution_context or
           attribute.is_setter_call_with_execution_context %}
@@ skipping 155 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 %}