ash uber tray: Make the user-card float a few pixels above the rest of the items.

ash/system/tray/tray_empty.h

+// 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_TRAY_EMPTY_H_
+#define ASH_SYSTEM_TRAY_TRAY_EMPTY_H_
+#pragma once
+
+#include "ash/system/tray/system_tray_item.h"
+
+namespace ash {
+namespace internal {
+
+class TrayEmpty : public SystemTrayItem {
+ public:
+  TrayEmpty();
+  virtual ~TrayEmpty();
+
+ private:
+  // Overridden from SystemTrayItem.
+  virtual views::View* CreateTrayView(user::LoginStatus status) OVERRIDE;
+  virtual views::View* CreateDefaultView(user::LoginStatus status) OVERRIDE;
+  virtual views::View* CreateDetailedView(user::LoginStatus status) OVERRIDE;
+  virtual void DestroyTrayView() OVERRIDE;
+  virtual void DestroyDefaultView() OVERRIDE;
+  virtual void DestroyDetailedView() OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(TrayEmpty);
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_SYSTEM_TRAY_TRAY_EMPTY_H_