Supporting callback for Disconnected signal.

dbus/bus.cc

Index: dbus/bus.cc
diff --git a/dbus/bus.cc b/dbus/bus.cc
index 6bd404c96622bc67c0ddbd0254f33cfa86694fa2..e4e91d7b1310d588a513a26a5e6c146d33bde211 100644
--- a/dbus/bus.cc
+++ b/dbus/bus.cc
@@ -211,6 +211,10 @@ Bus::~Bus() {
   // DCHECK_EQ(0, num_pending_timeouts_);
 }
 
+void Bus::SetDisconnectedCallback(const OnDisconnectedCallback& callback) {
+  on_disconnected_callback_ = callback;
+}
+
 ObjectProxy* Bus::GetObjectProxy(const std::string& service_name,
                                  const ObjectPath& object_path) {
   return GetObjectProxyWithOptions(service_name, object_path,
@@ -875,6 +879,9 @@ void Bus::OnConnectionDisconnected(DBusConnection* connection) {
     return;
   DCHECK(!dbus_connection_get_is_connected(connection));
 
+  if (!on_disconnected_callback_.is_null())
+    PostTaskToOriginThread(FROM_HERE, on_disconnected_callback_);
+
   if (shutdown_completed_)
     return;  // Do nothing if the shutdown is already completed.