Add SendSignalWithNoArgumentsToSystemBus() to dbus.h

chromeos/dbus/dbus.h

 // Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROMEOS_DBUS_H_
 #define CHROMEOS_DBUS_H_
 
 #include <dbus/dbus-glib.h>
 #include <glib-object.h>
 
@@ skipping 391 matching lines @@
                         glib::ScopedHashTable* result);
 
 // \brief Returns a connection to the system bus.
 
 BusConnection GetSystemBusConnection();
 
 // \brief Returns a private connection to a bus at |address|.
 
 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
 
 #endif  // CHROMEOS_DBUS_H_