[mojo] Ports EDK

mojo/edk/system/ports/user_data.h

Index: mojo/edk/system/ports/user_data.h
diff --git a/mojo/edk/system/ports/user_data.h b/mojo/edk/system/ports/user_data.h
new file mode 100644
index 0000000000000000000000000000000000000000..73e7d17b328b8af6b2c604c9891f62a19f59f1e0
--- /dev/null
+++ b/mojo/edk/system/ports/user_data.h
@@ -0,0 +1,25 @@
+// Copyright 2016 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 MOJO_EDK_SYSTEM_PORTS_USER_DATA_H_
+#define MOJO_EDK_SYSTEM_PORTS_USER_DATA_H_
+
+#include "base/memory/ref_counted.h"
+
+namespace mojo {
+namespace edk {
+namespace ports {
+
+class UserData : public base::RefCountedThreadSafe<UserData> {
+ protected:
+  friend class base::RefCountedThreadSafe<UserData>;
+
+  virtual ~UserData() {}
+};
+
+}  // namespace ports
+}  // namespace edk
+}  // namespace mojo
+
+#endif  // MOJO_EDK_SYSTEM_PORTS_USER_DATA_H_