Add mock classes for Bus, ObjectProxy, and ExportedObject.

dbus/mock_exported_object.cc

+// Copyright (c) 2011 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.
+
+#include "dbus/mock_exported_object.h"
+
+namespace dbus {
+
+MockExportedObject::MockExportedObject(Bus* bus,
+                                       const std::string& service_name,
+                                       const std::string& object_path)
+    : ExportedObject(bus, service_name, object_path) {
+}
+
+MockExportedObject::~MockExportedObject() {
+}
+
+}  // namespace dbus