Fix V8 bindings for named constructors to set prototype object correctly

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 138 matching lines @@
         'is_custom_element_callbacks': is_custom_element_callbacks,
         # TODO(yukishiino): Make all DOM attributes accessor-type properties.
         'is_data_type_property': is_data_type_property(interface, attribute),
         'is_getter_raises_exception':  # [RaisesException]
             'RaisesException' in extended_attributes and
             extended_attributes['RaisesException'] in (None, 'Getter'),
         'is_keep_alive_for_gc': keep_alive_for_gc,
         'is_lenient_this': 'LenientThis' in extended_attributes,
         'is_nullable': idl_type.is_nullable,
         'is_explicit_nullable': idl_type.is_explicit_nullable,
+        'is_named_constructor': is_named_constructor_attribute(attribute),
         'is_partial_interface_member':
             'PartialInterfaceImplementedAs' in extended_attributes,
         'is_per_world_bindings': 'PerWorldBindings' in extended_attributes,
         'is_put_forwards': 'PutForwards' in extended_attributes,
         'is_read_only': attribute.is_read_only,
         'is_reflect': is_reflect,
         'is_replaceable': 'Replaceable' in attribute.extended_attributes,
         'is_save_same_object': is_save_same_object,
         'is_static': attribute.is_static,
         'is_url': 'URL' in extended_attributes,
@@ skipping 395 matching lines @@
 idl_types.IdlType.constructor_type_name = property(
     # FIXME: replace this with a [ConstructorAttribute] extended attribute
     lambda self: strip_suffix(self.base_type, 'Constructor'))
 
 
 def is_constructor_attribute(attribute):
     # FIXME: replace this with [ConstructorAttribute] extended attribute
     return attribute.idl_type.name.endswith('Constructor')
 
 
+def is_named_constructor_attribute(attribute):
+    # FIXME: replace this with [NamedConstructor] extended attribute

[Yuki, 2017/01/19 09:57:28]

nit: FIXME is an old style in WebKit era, and we're now using the following
style.
  TODO(someone): ...

[bashi, 2017/01/19 09:58:01]

Can we remove this comment? I think FIXME comments like line 571 no longer make
sense.

[Yuki, 2017/01/19 10:09:30]

I'm fine to remove the comment.

[sashab, 2017/01/20 04:37:05]

Removed all 3 comments on lines 571, 566 and new added comment.

+    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']