Use the current context as the creation context for cross-origin objects.

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

Index: third_party/WebKit/Source/bindings/templates/interface_base.cpp.tmpl
diff --git a/third_party/WebKit/Source/bindings/templates/interface_base.cpp.tmpl b/third_party/WebKit/Source/bindings/templates/interface_base.cpp.tmpl
index 16bb616edd9650a10e3230642c7b258e75331c56..24b0f71591cb85e5f2c8e972d141744584102df2 100644
--- a/third_party/WebKit/Source/bindings/templates/interface_base.cpp.tmpl
+++ b/third_party/WebKit/Source/bindings/templates/interface_base.cpp.tmpl
@@ -218,7 +218,15 @@ static const struct {
   {% for attribute in attributes if attribute.has_cross_origin_getter or attribute.has_cross_origin_setter %}
   {
     "{{attribute.name}}",
-    {%+ if attribute.has_cross_origin_getter %}&{{cpp_class}}V8Internal::{{attribute.name}}AttributeGetter{% else %}nullptr{% endif %},
+    {% if attribute.has_cross_origin_getter %}
+    {% if attribute.has_custom_getter %}
+    {{v8_class}}::{{attribute.name}}AttributeGetterCustom,
+    {% else %}
+    &{{cpp_class}}V8Internal::{{attribute.name}}AttributeGetter,
+    {% endif %}
+    {% else %}
+    nullptr,
+    {% endif %}
     {%+ if attribute.has_cross_origin_setter %}&{{cpp_class}}V8Internal::{{attribute.name}}AttributeSetter{% else %}nullptr{% endif %},
   },
   {% endfor %}
@@ -285,9 +293,11 @@ static const struct {
   for (const auto& attribute : kCrossOriginAttributeTable)
     names.push_back(attribute.name);
 
-  v8SetReturnValue(
-      info,
-      ToV8(names, info.Holder(), info.GetIsolate()).As<v8::Array>());
+  // Use the current context as the creation context, as a cross-origin access
+  // may involve an object that does not have a creation context.
+  v8SetReturnValue(info,
+                   ToV8(names, info.GetIsolate()->GetCurrentContext()->Global(),
+                        info.GetIsolate()).As<v8::Array>());

[Yuki, 2017/01/24 10:31:04]

Why do we need .As<v8::Array>()?  I think we don't need it.

 }
 {% endif %}