IDL: Add support for [Unscopeable] on attributes and methods

Source/bindings/scripts/v8_interface.py

Index: Source/bindings/scripts/v8_interface.py
diff --git a/Source/bindings/scripts/v8_interface.py b/Source/bindings/scripts/v8_interface.py
index 1e1bd83912a5de375739dec37d9ffac3873a37b4..e9bd37af752c8991d0962b405a04d4b68c9ddef7 100644
--- a/Source/bindings/scripts/v8_interface.py
+++ b/Source/bindings/scripts/v8_interface.py
@@ -243,6 +243,15 @@ def interface_context(interface):
         includes.add('bindings/core/v8/V8ObjectConstructor.h')
         includes.add('core/frame/LocalDOMWindow.h')
 
+    # [Unscopeable] attributes and methods
+    unscopeables = []
+    for attribute in interface.attributes:
+        if 'Unscopeable' in attribute.extended_attributes:
+            unscopeables.append(attribute.name)
+    for method in interface.operations:
+        if 'Unscopeable' in method.extended_attributes:
+            unscopeables.append(method.name)
+
     context.update({
         'any_type_attributes': any_type_attributes,
         'constructors': constructors,
@@ -252,6 +261,7 @@ def interface_context(interface):
             interface_length(interface, constructors + custom_constructors),
         'is_constructor_raises_exception': extended_attributes.get('RaisesException') == 'Constructor',  # [RaisesException=Constructor]
         'named_constructor': named_constructor,
+        'unscopeables': sorted(unscopeables),
     })
 
     constants = [constant_context(constant, interface) for constant in interface.constants]