Restoring a session should restore window minimization state

ui/base/ui_base_types.h

+// Copyright (c) 2011 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 UI_BASE_UI_BASE_TYPES_H_
+#define UI_BASE_UI_BASE_TYPES_H_
+#pragma once
+
+namespace ui {
+
+// Window "show" state.  These values are written to disk so should not be
+// changed.
+enum WindowShowState {
+  // A default un-set state.
+  SHOW_STATE_DEFAULT    = 0,
+  SHOW_STATE_NORMAL     = 1,
+  SHOW_STATE_MINIMIZED  = 2,
+  SHOW_STATE_MAXIMIZED  = 3,
+  SHOW_STATE_MAX        = 4
+};
+
+}  // namespace ui
+
+#endif  // UI_BASE_UI_BASE_TYPES_H_