Add SendSignalWithNoArgumentsToSystemBus() to dbus.h

chromeos/dbus/dbus.h

Index: chromeos/dbus/dbus.h
diff --git a/chromeos/dbus/dbus.h b/chromeos/dbus/dbus.h
index 2bc44b9d0ce6a0bd3173954fa8f81188e433d56f..025802160d4f4155ef60a9ea3522171b7fbd7a7b 100644
--- a/chromeos/dbus/dbus.h
+++ b/chromeos/dbus/dbus.h
@@ -409,6 +409,13 @@ BusConnection GetSystemBusConnection();
 
 BusConnection GetPrivateBusConnection(const char* address);
 
+// \brief Sends a signal named |signal_name| with no arguments to the
+// system bus per the given |path| and |interface_name|.
+
+void SendSignalWithNoArgumentsToSystemBus(const char* path,
+                                          const char* interface_name,
+                                          const char* signal_name);
+
 }  // namespace dbus
 }  // namespace chromeos