dbus::ObjectManager: Add a match rule for properties before GetManagedObjects.

dbus/util.h

Index: dbus/util.h
diff --git a/dbus/util.h b/dbus/util.h
new file mode 100644
index 0000000000000000000000000000000000000000..b983b6fdb86e43101e2d50fd79e736073a07bab4
--- /dev/null
+++ b/dbus/util.h
@@ -0,0 +1,28 @@
+// Copyright 2014 The Chromium 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 DBUS_UTIL_H_
+#define DBUS_UTIL_H_
+
+#include <string>
+
+#include "dbus/dbus_export.h"
+
+namespace dbus {
+
+// Returns the absolute name of a member by concatanating |interface_name| and
+// |member_name|. e.g.:
+//    GetAbsoluteMemberName(
+//        "org.freedesktop.DBus.Properties",
+//        "PropertiesChanged")
+//
+//    => "org.freedesktop.DBus.Properties.PropertiesChanged"
+//
+CHROME_DBUS_EXPORT std::string GetAbsoluteMemberName(
+    const std::string& interface_name,
+    const std::string& member_name);
+
+}  // namespace dbus
+
+#endif  // DBUS_UTIL_H_