Add [DoNotGenerateClassBindings] extended attribute

Source/bindings/scripts/v8_interface.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 112 matching lines @@
 
     # [WillBeGarbageCollected]
     is_will_be_garbage_collected = 'WillBeGarbageCollected' in extended_attributes
 
     template_contents = {
         'conditional_string': conditional_string(interface),  # [Conditional]
         'cpp_class': cpp_name(interface),
         'has_custom_legacy_call_as_function': has_extended_attribute_value(interface, 'Custom', 'LegacyCallAsFunction'),  # [Custom=LegacyCallAsFunction]
         'has_custom_to_v8': has_extended_attribute_value(interface, 'Custom', 'ToV8'),  # [Custom=ToV8]
         'has_custom_wrap': has_extended_attribute_value(interface, 'Custom', 'Wrap'),  # [Custom=Wrap]
+        'has_class_bindings': 'DoNotGenerateClassBindings' not in extended_attributes,
         'has_visit_dom_wrapper': (
             # [Custom=Wrap], [SetWrapperReferenceFrom]
             has_extended_attribute_value(interface, 'Custom', 'VisitDOMWrapper') or
             reachable_node_function or
             set_wrapper_reference_to_list),
         'header_includes': header_includes,
         'interface_name': interface.name,
         'is_active_dom_object': 'ActiveDOMObject' in extended_attributes,  # [ActiveDOMObject]
         'is_audio_buffer': is_audio_buffer,
         'is_check_security': is_check_security,
@@ skipping 571 matching lines @@
         deleter = next(
             method
             for method in interface.operations
             if ('deleter' in method.specials and
                 len(method.arguments) == 1 and
                 method.arguments[0].idl_type == 'DOMString'))
     except StopIteration:
         return None
 
     return property_deleter(deleter)