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diff --git a/chromium/ash/wm/wm_types.h b/chromium/ash/wm/wm_types.h
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+++ b/chromium/ash/wm/wm_types.h
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+// Copyright 2013 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_WM_WM_TYPES_H_
+#define ASH_WM_WM_TYPES_H_
+
+#include "ui/base/ui_base_types.h"
+
+namespace ash {
+namespace wm {
+
+// This enum defines both common show state copied from
+// ui::WindowShowState as well as new states intoruduced in ash.
+// The separate enum is defined here because we don't want to leak
+// these type to ui/base until they're stable and we know for sure
+// that they'll persist over time.
+enum WindowShowType {
+  // Common state
+  SHOW_TYPE_DEFAULT = 0,
+
+  // Normal represents a state where the position/size has been
+  // specified by a use.
+  SHOW_TYPE_NORMAL,
+  SHOW_TYPE_MINIMIZED,
+  SHOW_TYPE_MAXIMIZED,
+  SHOW_TYPE_INACTIVE,
+  SHOW_TYPE_FULLSCREEN,
+  SHOW_TYPE_DETACHED,
+  SHOW_TYPE_END,  // to avoid using SHOW_STATE_END
+
+  // Ash specific states:
+
+  SHOW_TYPE_LEFT_SNAPPED,
+  SHOW_TYPE_RIGHT_SNAPPED,
+
+  // A window is in this state when it is automatically placed and
+  // sized by the window manager. (it's newly opened, or pushed to the side
+  // due to new window, for example).
+  SHOW_TYPE_AUTO_POSITIONED,
+};
+
+// Utility functions to convert WindowShowType <-> ui::WindowShowState.
+// Note: LEFT/RIGHT MAXIMIZED, AUTO_POSITIONED type will be lost when
+// converting to ui::WindowShowState.
+WindowShowType ToWindowShowType(ui::WindowShowState state);
+ui::WindowShowState ToWindowShowState(WindowShowType type);
+
+}  // namespace
+}  // namespace
+
+#endif  // ASH_WM_WM_TYPES_H_