1 files changed, 25 insertions, 0 deletions
diff --git a/ipc/chromium/src/mojo/core/ports/user_data.h b/ipc/chromium/src/mojo/core/ports/user_data.h
new file mode 100644
index 0000000000..f3d568c259
--- /dev/null
+++ b/ipc/chromium/src/mojo/core/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_CORE_PORTS_USER_DATA_H_
+#define MOJO_CORE_PORTS_USER_DATA_H_
+
+#include "nsISupportsImpl.h"
+
+namespace mojo {
+namespace core {
+namespace ports {
+
+class UserData {
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(UserData);
+
+ protected:
+  virtual ~UserData() = default;
+};
+
+}  // namespace ports
+}  // namespace core
+}  // namespace mojo
+
+#endif  // MOJO_CORE_PORTS_USER_DATA_H_