Add an aura window property for Immersive fullscreen mode

ui/aura/client/aura_constants.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 UI_AURA_CLIENT_AURA_CONSTANTS_H_
 #define UI_AURA_CLIENT_AURA_CONSTANTS_H_
 
 #include <string>
 
 #include "base/strings/string16.h"
@@ skipping 35 matching lines @@
 // pointer metrics. See AppType in ash/shared/app_types.h for more details.
 AURA_EXPORT extern const WindowProperty<int>* const kAppType;
 
 // A property key to store if a window is a constrained window or not.
 AURA_EXPORT extern const WindowProperty<bool>* const kConstrainedWindowKey;
 
 // A property key to indicate that a window should show that it deserves
 // attention.
 AURA_EXPORT extern const aura::WindowProperty<bool>* const kDrawAttentionKey;
 
+// A property key to indicate that a window should be in immersive mode when the
+// window enters the fullscreen mode. The immersive fullscreen mode is slightly
+// different from the normal fullscreen mode by allowing the user to reveal the
+// top portion of the window through a touch / mouse gesture.
+AURA_EXPORT extern const aura::WindowProperty<bool>* const
+    kImmersiveFullscreenKey;
+
 // A property key to indicate that a window is being "mirrored" and its contents
 // should render regardless of its actual visibility state.
 AURA_EXPORT extern const aura::WindowProperty<bool>* const kMirroringEnabledKey;
 
 // A property key to store the host window of a window. This lets
 // WebContentsViews find the windows that should constrain NPAPI plugins.
 AURA_EXPORT extern const WindowProperty<Window*>* const kHostWindowKey;
 
 // A property key to store the window modality.
 AURA_EXPORT extern const WindowProperty<ui::ModalType>* const kModalKey;
@@ skipping 45 matching lines @@
 
 AURA_EXPORT extern const aura::WindowProperty<ui::mojom::WindowType>* const
     kWindowTypeKey;
 
 // Alphabetical sort.
 
 }  // namespace client
 }  // namespace aura
 
 #endif  // UI_AURA_CLIENT_AURA_CONSTANTS_H_