Use visitDOMWrapper to preserve WebGL JS object wrappers

third_party/WebKit/Source/bindings/scripts/v8_interface.py

Index: third_party/WebKit/Source/bindings/scripts/v8_interface.py
diff --git a/third_party/WebKit/Source/bindings/scripts/v8_interface.py b/third_party/WebKit/Source/bindings/scripts/v8_interface.py
index aa6723d214d340475d7859480e1280df5e147fd4..87f82a493c5b940203101a3ecbbdefe609d1027f 100644
--- a/third_party/WebKit/Source/bindings/scripts/v8_interface.py
+++ b/third_party/WebKit/Source/bindings/scripts/v8_interface.py
@@ -209,9 +209,13 @@ def interface_context(interface):
         }
         set_wrapper_reference_to['idl_type'].add_includes_for_type()
 
+    # [Custom=VisitDOMWrapperExtra]
+    has_visit_dom_wrapper_extra = has_extended_attribute_value(interface, 'Custom', 'VisitDOMWrapperExtra')
+
     # [Custom=VisitDOMWrapper]
     has_visit_dom_wrapper = (
         has_extended_attribute_value(interface, 'Custom', 'VisitDOMWrapper') or
+        has_visit_dom_wrapper_extra or
         set_wrapper_reference_from or set_wrapper_reference_to)
 
     wrapper_class_id = ('NodeClassId' if inherits_interface(interface.name, 'Node') else 'ObjectClassId')
@@ -237,6 +241,7 @@ def interface_context(interface):
         'has_custom_legacy_call_as_function': has_extended_attribute_value(interface, 'Custom', 'LegacyCallAsFunction'),  # [Custom=LegacyCallAsFunction]
         'has_partial_interface': len(interface.partial_interfaces) > 0,
         'has_visit_dom_wrapper': has_visit_dom_wrapper,
+        'has_visit_dom_wrapper_extra': has_visit_dom_wrapper_extra,
         'header_includes': header_includes,
         'interface_name': interface.name,
         'is_array_buffer_or_view': is_array_buffer_or_view,