Add IPC messages for ARC notification

components/arc/common/arc_notification_types.cc

Index: components/arc/common/arc_notification_types.cc
diff --git a/components/arc/common/arc_notification_types.cc b/components/arc/common/arc_notification_types.cc
new file mode 100644
index 0000000000000000000000000000000000000000..5ad043222cc976dc7e464e14c249fd2cc0c12b4a
--- /dev/null
+++ b/components/arc/common/arc_notification_types.cc
@@ -0,0 +1,13 @@
+// Copyright 2015 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.
+
+// Using relative paths since this file is shared between chromium and android.
+#include "arc_notification_types.h"
+
+namespace arc {
+
+ArcNotificationData::ArcNotificationData() {}
+ArcNotificationData::~ArcNotificationData() {}
+
+}  // namespace arc