IDL: Add [LegacyInterfaceTypeChecking] extended attribute

Source/bindings/scripts/v8_interface.py

 # Copyright (C) 2013 Google Inc. All rights reserved.
 # coding=utf-8
 #
 # 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
@@ skipping 30 matching lines @@
 import idl_types
 from idl_types import IdlType, inherits_interface
 import v8_attributes
 from v8_globals import includes
 import v8_methods
 import v8_types
 from v8_types import cpp_ptr_type, cpp_template_type
 import v8_utilities
 from v8_utilities import (cpp_name_or_partial, capitalize, conditional_string, cpp_name, gc_type,
                           has_extended_attribute_value, runtime_enabled_function_name,
-                          extended_attribute_value_as_list)
+                          extended_attribute_value_as_list, is_legacy_interface_type_checking)
 
 
 INTERFACE_H_INCLUDES = frozenset([
     'bindings/core/v8/ScriptWrappable.h',
     'bindings/core/v8/ToV8.h',
     'bindings/core/v8/V8Binding.h',
     'bindings/core/v8/V8DOMWrapper.h',
     'bindings/core/v8/WrapperTypeInfo.h',
     'platform/heap/Handle.h',
 ])
@@ skipping 1206 matching lines @@
 
 
 def property_setter(setter, interface):
     if not setter:
         return None
 
     idl_type = setter.arguments[1].idl_type
     extended_attributes = setter.extended_attributes
     is_raises_exception = 'RaisesException' in extended_attributes
 
+    # [TypeChecking=Interface] / [LegacyInterfaceTypeChecking]
+    has_type_checking_interface = (
+        not is_legacy_interface_type_checking(interface, setter) and
+        idl_type.is_wrapper_type)
+
     return {
         'has_exception_state': (is_raises_exception or
                                 idl_type.v8_conversion_needs_exception_state),
-        'has_type_checking_interface':
-            (has_extended_attribute_value(interface, 'TypeChecking', 'Interface') or
-             has_extended_attribute_value(setter, 'TypeChecking', 'Interface')) and
-            idl_type.is_wrapper_type,
+        'has_type_checking_interface': has_type_checking_interface,
         'idl_type': idl_type.base_type,
         'is_custom': 'Custom' in extended_attributes,
         'is_nullable': idl_type.is_nullable,
         'is_raises_exception': is_raises_exception,
         'name': cpp_name(setter),
         'v8_value_to_local_cpp_value': idl_type.v8_value_to_local_cpp_value(
             extended_attributes, 'v8Value', 'propertyValue'),
     }
 
 
 def property_deleter(deleter):
     if not deleter:
         return None
 
     idl_type = deleter.idl_type
     extended_attributes = deleter.extended_attributes
     return {
         'is_custom': 'Custom' in extended_attributes,
         'is_raises_exception': 'RaisesException' in extended_attributes,
         'name': cpp_name(deleter),
     }