ash uber tray: Add a tray item for the user.

ash/system/tray_user.h

Index: ash/system/tray_user.h
diff --git a/ash/system/tray_user.h b/ash/system/tray_user.h
new file mode 100644
index 0000000000000000000000000000000000000000..2baede72fc7629694ea81afca6bd90ae4a16b298
--- /dev/null
+++ b/ash/system/tray_user.h
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+// Copyright (c) 2012 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 ASH_SYSTEM_TRAY_USER_H_
+#define ASH_SYSTEM_TRAY_USER_H_
+#pragma once
+
+#include "ash/system/tray/system_tray_item.h"
+
+namespace ash {
+namespace internal {
+
+class TrayUser : public SystemTrayItem {
+ public:
+  TrayUser();
+  virtual ~TrayUser();
+
+ private:
+  // Overridden from SystemTrayItem
+  virtual views::View* CreateTrayView() OVERRIDE;
+  virtual views::View* CreateDefaultView() OVERRIDE;
+  virtual views::View* CreateDetailedView() OVERRIDE;
+  virtual void DestroyTrayView() OVERRIDE;
+  virtual void DestroyDefaultView() OVERRIDE;
+  virtual void DestroyDetailedView() OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(TrayUser);
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_SYSTEM_TRAY_USER_H_