Allow the global object to be frozen through the global template

src/api-natives.cc

Index: src/api-natives.cc
diff --git a/src/api-natives.cc b/src/api-natives.cc
index ab1b06256e0301b0ba60ef4705a203ed9a3476b5..0405d329a857ba214cef6190f3d1e35ad00b09c7 100644
--- a/src/api-natives.cc
+++ b/src/api-natives.cc
@@ -613,10 +613,12 @@ Handle<JSFunction> ApiNatives::CreateApiFunction(
   }
 
   int internal_field_count = 0;
+  bool immutable_proto = false;
   if (!obj->instance_template()->IsUndefined(isolate)) {
     Handle<ObjectTemplateInfo> instance_template = Handle<ObjectTemplateInfo>(
         ObjectTemplateInfo::cast(obj->instance_template()));
     internal_field_count = instance_template->internal_field_count();
+    immutable_proto = instance_template->immutable_proto();
   }
 
   // TODO(svenpanne) Kill ApiInstanceType and refactor things by generalizing
@@ -650,6 +652,9 @@ Handle<JSFunction> ApiNatives::CreateApiFunction(
 
   Handle<Map> map =
       isolate->factory()->NewMap(type, instance_size, FAST_HOLEY_SMI_ELEMENTS);
+
+  if (immutable_proto) map->set_immutable_proto(true);

[adamk, 2016/11/04 18:06:12]

Please put this down below with all the others (after the call to
SetInitialMap).

+
   JSFunction::SetInitialMap(result, map, Handle<JSObject>::cast(prototype));
 
   // Mark as undetectable if needed.