Filter changed callback

lib/filterUpdateRegistration.js

Index: lib/filterUpdateRegistration.js
===================================================================
new file mode 100644
--- /dev/null
+++ b/lib/filterUpdateRegistration.js
@@ -0,0 +1,24 @@
+/*
+ * This file is part of Adblock Plus <http://adblockplus.org/>,
+ * Copyright (C) 2006-2013 Eyeo GmbH
+ *
+ * Adblock Plus is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Adblock Plus is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+let {FilterNotifier} = require("filterNotifier");
+
+FilterNotifier.addListener(function(action, subscription)
+{
+  if (subscription != undefined)
+    _triggerEvent("filterChange", action, subscription.url);
+});