Fixing problem with edge swipe exiting immersive mode

ash/wm/window_state.h

Index: ash/wm/window_state.h
diff --git a/ash/wm/window_state.h b/ash/wm/window_state.h
index 4ce47fdd275de07c806862b87139820d1d12b208..936caaa18a115b2041c839d5d272627142aa726d 100644
--- a/ash/wm/window_state.h
+++ b/ash/wm/window_state.h
@@ -267,6 +267,17 @@ class ASH_EXPORT WindowState : public aura::WindowObserver {
     top_row_keys_are_function_keys_ = value;
   }
 
+  // True if the window is in "immersive full screen mode" which 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. It might
+  // also allow the shelf to be shown in some situations.
+  bool in_immersive_fullscreen() const {
+    return in_immersive_fullscreen_;
+  }
+  void set_in_immersive_fullscreen(bool enable) {
+    in_immersive_fullscreen_ = enable;
+  }
+
   // Creates and takes ownership of a pointer to DragDetails when resizing is
   // active. This should be done before a resizer gets created.
   void CreateDragDetails(aura::Window* window,
@@ -342,6 +353,7 @@ class ASH_EXPORT WindowState : public aura::WindowObserver {
   scoped_ptr<DragDetails> drag_details_;
 
   bool unminimize_to_restore_bounds_;
+  bool in_immersive_fullscreen_;
   bool hide_shelf_when_fullscreen_;
   bool minimum_visibility_;
   bool can_be_dragged_;