Add API for access checks on observed objects

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index b926c222a5777f911d022d7f242af8033bb632a3..96b3ed233bb3742c6ee1bc7d9f63acd3febe476a 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -1467,6 +1467,7 @@ void ObjectTemplate::MarkAsUndetectable() {
 void ObjectTemplate::SetAccessCheckCallbacks(
       NamedSecurityCallback named_callback,
       IndexedSecurityCallback indexed_callback,
+      ObserveSecurityCallback observe_callback,
       Handle<Value> data,
       bool turned_on_by_default) {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
@@ -1484,6 +1485,7 @@ void ObjectTemplate::SetAccessCheckCallbacks(
 
   SET_FIELD_WRAPPED(info, set_named_callback, named_callback);
   SET_FIELD_WRAPPED(info, set_indexed_callback, indexed_callback);
+  SET_FIELD_WRAPPED(info, set_observe_callback, observe_callback);
 
   if (data.IsEmpty()) data = v8::Undefined();
   info->set_data(*Utils::OpenHandle(*data));
@@ -1495,6 +1497,18 @@ void ObjectTemplate::SetAccessCheckCallbacks(
   cons->set_needs_access_check(turned_on_by_default);
 }
 
+void ObjectTemplate::SetAccessCheckCallbacks(
+      NamedSecurityCallback named_callback,
+      IndexedSecurityCallback indexed_callback,
+      Handle<Value> data,
+      bool turned_on_by_default) {
+  return SetAccessCheckCallbacks(named_callback,
+                                 indexed_callback,
+                                 NULL,
+                                 data,
+                                 turned_on_by_default);
+}
+
 
 void ObjectTemplate::SetIndexedPropertyHandler(
       IndexedPropertyGetter getter,