bindings: Pass is_null flag to attribute setters when they are nullable

third_party/WebKit/Source/bindings/scripts/v8_attributes.py

 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 442 matching lines @@
             arguments.append(
                 'V8EventListenerHelper::EnsureEventListener<V8ErrorHandler>(' +
                 'v8Value, true, ScriptState::ForReceiverObject(info))')
         else:
             arguments.append(
                 'V8EventListenerHelper::GetEventListener(' +
                 'ScriptState::ForReceiverObject(info), v8Value, true, ' +
                 'kListenerFindOrCreate)')
     else:
         arguments.append('cppValue')
+    if idl_type.is_explicit_nullable:
+        arguments.append('isNull')
     if context['is_setter_raises_exception']:
         arguments.append('exceptionState')
 
     return '%s(%s)' % (setter_name, ', '.join(arguments))
 
 
 CONTENT_ATTRIBUTE_SETTER_NAMES = {
     'boolean': 'SetBooleanAttribute',
     'long': 'SetIntegralAttribute',
     'unsigned long': 'SetUnsignedIntegralAttribute',
@@ skipping 89 matching lines @@
 def is_constructor_attribute(attribute):
     return attribute.idl_type.name.endswith('Constructor')
 
 
 def is_named_constructor_attribute(attribute):
     return attribute.idl_type.name.endswith('ConstructorConstructor')
 
 
 def update_constructor_attribute_context(interface, attribute, context):
     context['needs_constructor_getter_callback'] = context['measure_as'] or context['deprecate_as']