Move maximize/fullscreen/restore to shell

ui/aura/aura_constants.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_AURA_AURA_CONSTANTS_H_
 #define UI_AURA_AURA_CONSTANTS_H_
 #pragma once
 
 #include "ui/aura/aura_export.h"
 
 namespace aura {
+// Window property keys that are shared between aura_shell and chrome/views.
 
+// A property key to store the restore bounds for a window. The type
+// of the value is |gfx::Rect*|.
+AURA_EXPORT extern const char* kRestoreBoundsKey;
+
+// A property key to store ui::WindowShowState for a window.
+// See ui/base/ui_base_types.h for its definition.
+AURA_EXPORT extern const char* kShowStateKey;
+
+// A property key to store tooltip text for a window. The type of the value
+// is |std::string*|.
 AURA_EXPORT extern const char* kTooltipTextKey;
 
 }  // namespace aura
 
 #endif  // UI_AURA_AURA_CONSTANTS_H_