[Origin Trials] Install origin trial bindings on V8 context conditionally

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 124 matching lines @@
         'is_read_only': attribute.is_read_only,
         'is_reflect': is_reflect,
         'is_replaceable': 'Replaceable' in attribute.extended_attributes,
         'is_static': attribute.is_static,
         'is_url': 'URL' in extended_attributes,
         'is_unforgeable': is_unforgeable(interface, attribute),
         'on_instance': v8_utilities.on_instance(interface, attribute),
         'on_interface': v8_utilities.on_interface(interface, attribute),
         'on_prototype': v8_utilities.on_prototype(interface, attribute),
         'origin_trial_enabled_function': v8_utilities.origin_trial_enabled_function_name(attribute),  # [OriginTrialEnabled]
+        'origin_trial_feature_name': v8_utilities.origin_trial_feature_name(attribute),  # [OriginTrialEnabled]
         'use_output_parameter_for_result': idl_type.use_output_parameter_for_result,
         'measure_as': v8_utilities.measure_as(attribute, interface),  # [MeasureAs]
         'name': attribute.name,
         'only_exposed_to_private_script': is_only_exposed_to_private_script,
         'private_script_v8_value_to_local_cpp_value': idl_type.v8_value_to_local_cpp_value(
             extended_attributes, 'v8Value', 'cppValue', bailout_return_value='false', isolate='scriptState->isolate()'),
         'property_attributes': property_attributes(interface, attribute),
         'reflect_empty': extended_attributes.get('ReflectEmpty'),
         'reflect_invalid': extended_attributes.get('ReflectInvalid', ''),
         'reflect_missing': extended_attributes.get('ReflectMissing'),
         'reflect_only': extended_attribute_value_as_list(attribute, 'ReflectOnly'),
         'runtime_enabled_function': v8_utilities.runtime_enabled_function_name(attribute),  # [RuntimeEnabled]
         'runtime_feature_name': v8_utilities.runtime_feature_name(attribute),  # [RuntimeEnabled]
         'should_be_exposed_to_script': not (is_implemented_in_private_script and is_only_exposed_to_private_script),
         'world_suffixes': (
             ['', 'ForMainWorld']
             if 'PerWorldBindings' in extended_attributes
             else ['']),  # [PerWorldBindings]
     }
 
     if is_constructor_attribute(attribute):
         update_constructor_attribute_context(interface, attribute, context)
     if not has_custom_getter(attribute):
         getter_context(interface, attribute, context)
     if not has_custom_setter(attribute) and has_setter(interface, attribute):
         setter_context(interface, attribute, context)
 
+    # [OriginTrialEnabled]
+    # TODO(iclelland): Allow origin trials on static interfaces
+    # (crbug.com/614352)
+    if context['origin_trial_feature_name'] and context['on_interface']:
+        raise Exception('[OriginTrialEnabled] cannot be specified on static '
+                        'attributes: %s.%s' % (interface.name, attribute.name))
+
     return context
 
 
 def filter_has_accessor_configuration(attributes):
     return [attribute for attribute in attributes if
             not (attribute['exposed_test'] or
+                 attribute['origin_trial_enabled_function'] or
                  attribute['runtime_enabled_function']) and
             not attribute['is_data_type_property'] and
             attribute['should_be_exposed_to_script']]
 
 
 def filter_has_attribute_configuration(attributes):
     return [attribute for attribute in attributes if
             not (attribute['exposed_test'] or
+                 attribute['origin_trial_enabled_function'] or
                  attribute['runtime_enabled_function']) and
             attribute['is_data_type_property'] and
             attribute['should_be_exposed_to_script']]
 
 
+def filter_origin_trial_enabled(attributes):
+    return [attribute for attribute in attributes if
+            attribute['origin_trial_feature_name'] and
+            not attribute['exposed_test']]
+
+
 def filter_runtime_enabled(attributes):
     return [attribute for attribute in attributes if
             attribute['runtime_feature_name'] and
             not attribute['exposed_test']]
 
 
 def attribute_filters():
     return {'has_accessor_configuration': filter_has_accessor_configuration,
             'has_attribute_configuration': filter_has_attribute_configuration,
+            'origin_trial_enabled_attributes': filter_origin_trial_enabled,
             'runtime_enabled_attributes': filter_runtime_enabled,
             }
 
 
 ################################################################################
 # Getter
 ################################################################################
 
 def getter_context(interface, attribute, context):
     idl_type = attribute.idl_type
@@ skipping 333 matching lines @@
     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 update_constructor_attribute_context(interface, attribute, context):
     context['needs_constructor_getter_callback'] = context['measure_as'] or context['deprecate_as'] or context['origin_trial_enabled_function']  # TODO(chasej): Should/can this be true when OriginTrialEnabled is inherited from containing interface?