Move most DOM attributes to prototype chains

Source/bindings/scripts/v8_attributes.py

Index: Source/bindings/scripts/v8_attributes.py
diff --git a/Source/bindings/scripts/v8_attributes.py b/Source/bindings/scripts/v8_attributes.py
index af41aa9117800d9faac8a6e7ce34663dbd00470c..d5c524000ada2dd96d8c438f123766a76c1239bf 100644
--- a/Source/bindings/scripts/v8_attributes.py
+++ b/Source/bindings/scripts/v8_attributes.py
@@ -100,7 +100,7 @@ def attribute_context(interface, attribute):
         'is_call_with_script_state': v8_utilities.has_extended_attribute_value(attribute, 'CallWith', 'ScriptState'),
         'is_check_security_for_node': is_check_security_for_node,
         'is_custom_element_callbacks': is_custom_element_callbacks,
-        'is_expose_js_accessors': 'ExposeJSAccessors' in extended_attributes,
+        'is_expose_js_accessors': should_expose_js_accessors(attribute, interface),
         'is_getter_raises_exception':  # [RaisesException]
             'RaisesException' in extended_attributes and
             extended_attributes['RaisesException'] in (None, 'Getter'),
@@ -487,6 +487,36 @@ def has_custom_setter(attribute):
             extended_attributes['Custom'] in [None, 'Setter'])
 
 
+# [ExposeJSAccessors]
+def should_expose_js_accessors(attribute, interface):
+    extended_attributes = attribute.extended_attributes
+
+    # FIXME: We should move all DOM attributes to prototype chains
+    # (except for a couple that really need to stay on instances).
+    # These conditions are a hack to move DOM attributes that we can
+    # move easily to prototype chains. Eventually all the conditions
+    # will be gone.
+    return (not has_custom_getter(attribute) and
+            not has_custom_setter(attribute) and
+            not attribute.is_static and
+            'Replaceable' not in extended_attributes and
+            'Unforgeable' not in extended_attributes and
+            'PutForwards' not in extended_attributes and
+            not v8_utilities.per_context_enabled_function_name(attribute) and
+            not v8_utilities.runtime_enabled_function_name(attribute) and
+            not is_constructor_attribute(attribute) and
+            not interface.name == 'Window' and
+            not interface.name == 'WorkerGlobalScope' and
+            not attribute.idl_type.base_type == 'EventHandler' and
+            not v8_utilities.indexed_property_getter(interface) and
+            not v8_utilities.indexed_property_setter(interface) and
+            not v8_utilities.indexed_property_deleter(interface) and
+            not v8_utilities.named_property_getter(interface) and
+            not v8_utilities.named_property_setter(interface) and
+            not v8_utilities.named_property_deleter(interface) and
+            'OverrideBuiltins' not in interface.extended_attributes)
+
+
 ################################################################################
 # Constructors
 ################################################################################