Second attempt at moving the StackingClient to a property on the RootWindow.

ui/aura/client/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_CLIENT_AURA_CONSTANTS_H_
 #define UI_AURA_CLIENT_AURA_CONSTANTS_H_
 #pragma once
 
 #include "ui/aura/aura_export.h"
 
@@ skipping 12 matching lines @@
 // the value is |aura::WindowDragDropDelegate*|.
 AURA_EXPORT extern const char kDragDropDelegateKey[];
 
 // A property key to store the boolean property of window modality.
 AURA_EXPORT extern const char kModalKey[];
 
 // 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 a client that handles window activation. The type of
+// the value is |aura::ActivationClient*|.
+AURA_EXPORT extern const char kRootWindowActivationClient[];
+
+// A property key to store what the client defines as the active window on the
+// RootWindow. The type of the value is |aura::Window*|.
+AURA_EXPORT extern const char kRootWindowActiveWindow[];
+
 // A property key to store the drag and drop client for the root window. The
 // type of the value is |aura::DragDropClient*|.
 AURA_EXPORT extern const char kRootWindowDragDropClientKey[];
 
+// A property key to store a client that handles window parenting. The type of
+// the value is |aura::client::StackingClient*|.
+AURA_EXPORT extern const char kRootWindowStackingClient[];
+
 // A property key to store the tooltip client for the root window. The type of
 // the value is |aura::TooltipClient*|.
 AURA_EXPORT extern const char kRootWindowTooltipClientKey[];
 
-// A property key to store what the client defines as the active window on the
-// RootWindow. The type of the value is |aura::Window*|.
-AURA_EXPORT extern const char kRootWindowActiveWindow[];
-
-// A property key to store a client that handles window activation. The type of
-// the value is |aura::ActivationClient*|.
-AURA_EXPORT extern const char kRootWindowActivationClient[];
-
 // A property key for a value from aura::ShadowType describing the drop shadow
 // that should be displayed under the window.  If unset, no shadow is displayed.
 AURA_EXPORT extern const char kShadowTypeKey[];
 
 // 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 |string16*|.
 AURA_EXPORT extern const char kTooltipTextKey[];
 
 // Alphabetical sort.
 
 }  // namespace aura
 
 #endif  // UI_AURA_CLIENT_AURA_CONSTANTS_H_