Add policy for builtin message sources

Some notifications, despite being emitted by shell code, should appear
to be from application or "separable" system components. Do that by
associating them with a notification-daemon policy.

Note that for this to look really good, empathy should rename itself
to Chat.

https://bugzilla.gnome.org/show_bug.cgi?id=685926

js/ui/status/bluetooth.js

@@ -9,6 +9,7 @@ const St = imports.gi.St;
 
 const Main = imports.ui.main;
 const MessageTray = imports.ui.messageTray;
+const NotificationDaemon = imports.ui.notificationDaemon;
 const PanelMenu = imports.ui.panelMenu;
 const PopupMenu = imports.ui.popupMenu;
 
@@ -286,6 +287,7 @@ const Indicator = new Lang.Class({
     _ensureSource: function() {
         if (!this._source) {
             this._source = new MessageTray.Source(_("Bluetooth"), 'bluetooth-active');
+            this._source.policy = new NotificationDaemon.NotificationApplicationPolicy('gnome-bluetooth-panel');
             Main.messageTray.add(this._source);
         }
     },