Add [CachedAccessor] attribute to cache (almost) constant accessors (window.document).

third_party/WebKit/Source/bindings/scripts/v8_attributes.py

Index: third_party/WebKit/Source/bindings/scripts/v8_attributes.py
diff --git a/third_party/WebKit/Source/bindings/scripts/v8_attributes.py b/third_party/WebKit/Source/bindings/scripts/v8_attributes.py
index f27015b2e7e865dd0506b293046eabdb2841326a..367f0046876dd7cb454a4c2462dd2efdd4a146cd 100644
--- a/third_party/WebKit/Source/bindings/scripts/v8_attributes.py
+++ b/third_party/WebKit/Source/bindings/scripts/v8_attributes.py
@@ -119,7 +119,6 @@ def attribute_context(interface, attribute):
         'enum_type': idl_type.enum_type,
         'enum_values': idl_type.enum_values,
         'exposed_test': v8_utilities.exposed(attribute, interface),  # [Exposed]
-        'has_fast_accessor': 'FastAccessor' in extended_attributes,

[jochen (gone - plz use gerrit), 2016/09/15 08:20:51]

unrelated?

[Alfonso, 2016/09/16 14:21:48]

The attribute is duplicated, will move it to the Fast-Accessors CL.
Ack-ed.

         'has_custom_getter': has_custom_getter(attribute),
         'has_custom_setter': has_custom_setter(attribute),
         'has_fast_accessor': 'FastAccessor' in extended_attributes,
@@ -132,7 +131,7 @@ def attribute_context(interface, attribute):
         'is_check_security_for_return_value': is_check_security_for_return_value,
         '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_data_type_property': not ('StoreInField' in extended_attributes) and is_data_type_property(interface, attribute),
         'is_getter_raises_exception':  # [RaisesException]
             'RaisesException' in extended_attributes and
             extended_attributes['RaisesException'] in (None, 'Getter'),
@@ -150,6 +149,7 @@ def attribute_context(interface, attribute):
         'is_replaceable': 'Replaceable' in attribute.extended_attributes,
         'is_save_same_object': is_save_same_object,
         'is_static': attribute.is_static,
+        'is_store_in_field': 'StoreInField' in extended_attributes,
         'is_url': 'URL' in extended_attributes,
         'is_unforgeable': is_unforgeable(interface, attribute),
         'on_instance': v8_utilities.on_instance(interface, attribute),
@@ -172,6 +172,7 @@ def attribute_context(interface, attribute):
         'runtime_feature_name': v8_utilities.runtime_feature_name(attribute),  # [RuntimeEnabled]
         'secure_context_test': v8_utilities.secure_context(attribute, interface),  # [SecureContext]
         'should_be_exposed_to_script': not (is_implemented_in_private_script and is_only_exposed_to_private_script),
+        'surrogate_name': '%s#%s' % (interface.name, attribute.name),
         'world_suffixes': (
             ['', 'ForMainWorld']
             if 'PerWorldBindings' in extended_attributes