Move most DOM attributes to prototype chains

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 82 matching lines @@
         'deprecate_as': v8_utilities.deprecate_as(attribute),  # [DeprecateAs]
         'enum_validation_expression': idl_type.enum_validation_expression,
         'exposed_test': v8_utilities.exposed(attribute, interface),  # [Exposed]
         'has_custom_getter': has_custom_getter(attribute),
         'has_custom_setter': has_custom_setter(attribute),
         'idl_type': str(idl_type),  # need trailing [] on array for Dictionary::ConversionContext::setConversionType
         'is_call_with_execution_context': v8_utilities.has_extended_attribute_value(attribute, 'CallWith', 'ExecutionContext'),
         'is_call_with_script_state': v8_utilities.has_extended_attribute_value(attribute, 'CallWith', 'ScriptState'),
         'is_check_security_for_node': is_check_security_for_node,
         'is_custom_element_callbacks': is_custom_element_callbacks,
-        'is_expose_js_accessors': 'ExposeJSAccessors' in extended_attributes,
+        'is_expose_js_accessors': should_expose_js_accessors(attribute, interface),
         'is_getter_raises_exception':  # [RaisesException]
             'RaisesException' in extended_attributes and
             extended_attributes['RaisesException'] in (None, 'Getter'),
         'is_implemented_in_private_script': is_implemented_in_private_script,
         'is_initialized_by_event_constructor':
             'InitializedByEventConstructor' in extended_attributes,
         'is_keep_alive_for_gc': is_keep_alive_for_gc(interface, attribute),
         'is_nullable': idl_type.is_nullable,
         'is_explicit_nullable': idl_type.is_explicit_nullable,
         'is_partial_interface_member':
@@ skipping 366 matching lines @@
 
 
 # [Custom], [Custom=Setter]
 def has_custom_setter(attribute):
     extended_attributes = attribute.extended_attributes
     return (not attribute.is_read_only and
             'Custom' in extended_attributes and
             extended_attributes['Custom'] in [None, 'Setter'])
 
 
+# [ExposeJSAccessors]
+def should_expose_js_accessors(attribute, interface):
+    extended_attributes = attribute.extended_attributes
+
+    # FIXME: We should move all DOM attributes to prototype chains
+    # (except for a couple that really need to stay on instances).
+    # These conditions are a hack to move DOM attributes that we can
+    # move easily to prototype chains. Eventually all the conditions
+    # will be gone.
+    return (not has_custom_getter(attribute) and
+            not has_custom_setter(attribute) and
+            not attribute.is_static and
+            'Replaceable' not in extended_attributes and
+            'Unforgeable' not in extended_attributes and
+            'PutForwards' not in extended_attributes and
+            not v8_utilities.per_context_enabled_function_name(attribute) and
+            not v8_utilities.runtime_enabled_function_name(attribute) and
+            not is_constructor_attribute(attribute) and
+            not interface.name == 'Window' and
+            not interface.name == 'WorkerGlobalScope' and
+            not attribute.idl_type.base_type == 'EventHandler' and
+            not v8_utilities.indexed_property_getter(interface) and
+            not v8_utilities.indexed_property_setter(interface) and
+            not v8_utilities.indexed_property_deleter(interface) and
+            not v8_utilities.named_property_getter(interface) and
+            not v8_utilities.named_property_setter(interface) and
+            not v8_utilities.named_property_deleter(interface) and
+            'OverrideBuiltins' not in interface.extended_attributes)
+
+
 ################################################################################
 # Constructors
 ################################################################################
 
 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 constructor_getter_context(interface, attribute, context):
     context['needs_constructor_getter_callback'] = context['measure_as'] or context['deprecate_as']