Freeze global prototype chain per WebIDL

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 c2aa1f551e7b4c4236f0a5a23d561a130c002519..04cba59fee4b7ecc66f72695852aa28ff8665772 100644
--- a/third_party/WebKit/Source/bindings/scripts/v8_interface.py
+++ b/third_party/WebKit/Source/bindings/scripts/v8_interface.py
@@ -198,6 +198,11 @@ def interface_context(interface, interfaces):
     is_global = ('PrimaryGlobal' in extended_attributes or
                  'Global' in extended_attributes)
 
+    # [ImmutablePrototype]
+    # TODO(littledan): Is it possible to deduce this based on inheritance,
+    # as in the WebIDL spec?
+    is_immutable_prototype = is_global or 'ImmutablePrototype' in extended_attributes

[haraken, 2016/10/27 08:47:05]

Why is is_global not enough? You want to set the immutable prototype only on
[Global] or [PrimaryGlobal] interfaces, right?

[Dan Ehrenberg, 2016/10/27 09:03:45]

Also EventTarget

+
     # [SetWrapperReferenceFrom]
     set_wrapper_reference_from = extended_attributes.get('SetWrapperReferenceFrom')
     if set_wrapper_reference_from:
@@ -258,6 +263,7 @@ def interface_context(interface, interfaces):
         'is_event_target': is_event_target,
         'is_exception': interface.is_exception,
         'is_global': is_global,
+        'is_immutable_prototype': is_immutable_prototype,
         'is_node': inherits_interface(interface.name, 'Node'),
         'is_partial': interface.is_partial,
         'is_typed_array_type': is_typed_array_type,