Implement cross-origin attributes using access check interceptors.

third_party/WebKit/Source/bindings/templates/attributes.cpp.tmpl

Index: third_party/WebKit/Source/bindings/templates/attributes.cpp.tmpl
diff --git a/third_party/WebKit/Source/bindings/templates/attributes.cpp.tmpl b/third_party/WebKit/Source/bindings/templates/attributes.cpp.tmpl
index 481492af10fa15f4173687eca5c6f6e11634275c..90391cb6a1d51fcdff982006aee65c6254b9c724 100644
--- a/third_party/WebKit/Source/bindings/templates/attributes.cpp.tmpl
+++ b/third_party/WebKit/Source/bindings/templates/attributes.cpp.tmpl
@@ -259,7 +259,9 @@ void {{attribute.name}}ConstructorGetterCallback{{world_suffix}}(v8::Local<v8::N
 {##############################################################################}
 {% macro attribute_setter(attribute, world_suffix) %}
 static void {{attribute.name}}AttributeSetter{{world_suffix}}(
-{%- if attribute.is_data_type_property %}
+{%- if attribute.has_cross_origin_setter %}
+v8::Local<v8::Value> v8Value, const V8CrossOriginSetterInfo& info
+{%- elif attribute.is_data_type_property %}
 v8::Local<v8::Value> v8Value, const v8::PropertyCallbackInfo<void>& info
 {%- else %}
 v8::Local<v8::Value> v8Value, const v8::FunctionCallbackInfo<v8::Value>& info
@@ -412,6 +414,8 @@ const v8::FunctionCallbackInfo<v8::Value>& info
 
   {% if attribute.has_custom_setter %}
   {{v8_class}}::{{attribute.name}}AttributeSetterCustom(v8Value, info);
+  {% elif attribute.has_cross_origin_setter %}
+  {{cpp_class_or_partial}}V8Internal::{{attribute.name}}AttributeSetter{{world_suffix}}(v8Value, V8CrossOriginSetterInfo(info.GetIsolate(), info.Holder()));

[haraken, 2016/12/08 08:21:02]

You don't need to support {{world_suffix}} since [CrossOrigin] doesn't support
per-world bindings.

[dcheng, 2016/12/08 09:04:10]

Done.

   {% else %}
   {{cpp_class_or_partial}}V8Internal::{{attribute.name}}AttributeSetter{{world_suffix}}(v8Value, info);
   {% endif %}