Dragging panels near screen edge

ash/wm/panels/panel_layout_manager.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_PANELS_PANEL_LAYOUT_MANAGER_H_
 #define ASH_WM_PANELS_PANEL_LAYOUT_MANAGER_H_
 
 #include <list>
 
 #include "ash/ash_export.h"
@@ skipping 134 matching lines @@
 
   // Update the callout arrows for all managed panels.
   void UpdateCallouts();
 
   // Overridden from keyboard::KeyboardControllerObserver:
   virtual void OnKeyboardBoundsChanging(
       const gfx::Rect& keyboard_bounds) OVERRIDE;
 
   // Parent window associated with this layout manager.
   aura::Window* panel_container_;
+  // Protect against recursive calls to OnWindowAddedToLayout().
+  bool in_add_window_;
   // Protect against recursive calls to Relayout().
   bool in_layout_;
   // Ordered list of unowned pointers to panel windows.
   PanelList panel_windows_;
   // The panel being dragged.
   aura::Window* dragged_panel_;
   // The launcher we are observing for launcher icon changes.
   Launcher* launcher_;
   // The shelf layout manager being observed for visibility changes.
   ShelfLayoutManager* shelf_layout_manager_;
   // Tracks the visibility of the shelf. Defaults to false when there is no
   // shelf.
   bool shelf_hidden_;
   // The last active panel. Used to maintain stacking even if no panels are
   // currently focused.
   aura::Window* last_active_panel_;
   base::WeakPtrFactory<PanelLayoutManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PanelLayoutManager);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_PANELS_PANEL_LAYOUT_MANAGER_H_