Exempt status bubble windows from status bar darkening

ash/wm/window_properties.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_WM_WINDOW_PROPERTIES_H_
 #define ASH_WM_WINDOW_PROPERTIES_H_
 
 #include "ash/wm/property_util.h"
 #include "ash/wm/shadow_types.h"
 #include "ui/aura/window.h"
@@ skipping 15 matching lines @@
 // A Key to store AlwaysOnTopController per RootWindow. The value is
 // owned by the RootWindow.
 extern const aura::WindowProperty<internal::AlwaysOnTopController*>* const
     kAlwaysOnTopControllerKey;
 
 // Property set on all windows whose child windows' visibility changes are
 // animated.
 extern const aura::WindowProperty<bool>* const
     kChildWindowVisibilityChangesAnimatedKey;
 
+// True if the window is ignored by the shelf layout manager for purposes of
+// darkening the shelf.
+extern const aura::WindowProperty<bool>* const
+    kIgnoredByShelfKey;
+
 // Used to remember the show state before the window was minimized.
 extern const aura::WindowProperty<ui::WindowShowState>* const
     kRestoreShowStateKey;
 
 extern const aura::WindowProperty<RootWindowController*>* const
     kRootWindowControllerKey;
 
 // A property key describing the drop shadow that should be displayed under the
 // window.  If unset, no shadow is displayed.
 extern const aura::WindowProperty<ShadowType>* const kShadowTypeKey;
@@ skipping 11 matching lines @@
 // True if the window is controlled by the workspace manager.
 extern const aura::WindowProperty<bool>* const
     kWindowTrackedByWorkspaceKey;
 
 // Alphabetical sort.
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_WINDOW_PROPERTIES_H_