Support deprecation + use counters for constructor attributes.

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 119 matching lines @@
             if 'ReflectOnly' in extended_attributes else None,
         'setter_callback': setter_callback_name(interface, attribute),
         'v8_type': v8_types.v8_type(idl_type),
         'runtime_enabled_function': v8_utilities.runtime_enabled_function_name(attribute),  # [RuntimeEnabled]
         'world_suffixes': ['', 'ForMainWorld']
                           if 'PerWorldBindings' in extended_attributes
                           else [''],  # [PerWorldBindings]
     }
 
     if is_constructor_attribute(attribute):
+        generate_constructor_getter(interface, attribute, contents)
         return contents
     if not has_custom_getter:
         generate_getter(interface, attribute, contents)
     if (not has_custom_setter and
         (not attribute.is_read_only or 'PutForwards' in extended_attributes)):
         generate_setter(interface, attribute, contents)
 
     return contents
 
 
@@ skipping 239 matching lines @@
         property_attributes_list.append('v8::DontDelete')
     return property_attributes_list or ['v8::None']
 
 
 ################################################################################
 # Constructors
 ################################################################################
 
 def is_constructor_attribute(attribute):
     return attribute.idl_type.endswith('Constructor')
+
+
+def generate_constructor_getter(interface, attribute, contents):
+    contents['needs_constructor_getter_callback'] = contents['measure_as'] or contents['deprecate_as']