Add [CEReactions] IDL attributes for Custom Elements V1

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 5357fe9235a04845fc81fc692f678e8deedc67b3..4b27524230bda7e0049fb2fcad2b3690aa65ad85 100644
--- a/third_party/WebKit/Source/bindings/scripts/v8_attributes.py
+++ b/third_party/WebKit/Source/bindings/scripts/v8_attributes.py
@@ -67,6 +67,10 @@ def attribute_context(interface, attribute):
     # are not methods.  Constructors must be data-type properties, and we can
     # support them as a kind of methods.
     constructor_type = idl_type.constructor_type_name if is_constructor_attribute(attribute) else None
+    # [CEReactions]
+    is_ce_reactions = 'CEReactions' in extended_attributes
+    if is_ce_reactions:
+        includes.add('core/dom/custom/CEReactionsScope.h')
     # [CustomElementCallbacks], [Reflect]
     is_custom_element_callbacks = 'CustomElementCallbacks' in extended_attributes
     is_reflect = 'Reflect' in extended_attributes
@@ -121,6 +125,7 @@ def attribute_context(interface, attribute):
         'idl_type': str(idl_type),  # need trailing [] on array for Dictionary::ConversionContext::setConversionType
         'is_call_with_execution_context': has_extended_attribute_value(attribute, 'CallWith', 'ExecutionContext'),
         'is_call_with_script_state': has_extended_attribute_value(attribute, 'CallWith', 'ScriptState'),
+        'is_ce_reactions': is_ce_reactions,
         'is_check_security_for_receiver': is_check_security_for_receiver,
         'is_check_security_for_return_value': is_check_security_for_return_value,
         'is_custom_element_callbacks': is_custom_element_callbacks,