Draw web content area correctly on a phantom window for window dragging

ash/wm/window_util.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_UTIL_H_
 #define ASH_WM_WINDOW_UTIL_H_
 
 #include "ash/ash_export.h"
 
 namespace aura {
 class RootWindow;
 class Window;
 }
 
+namespace ui {
+class Layer;
+}
+
 namespace ash {
 namespace internal {
 class RootWindowController;
 }
 namespace wm {
 
 // Convenience setters/getters for |aura::client::kRootWindowActiveWindow|.
 ASH_EXPORT void ActivateWindow(aura::Window* window);
 ASH_EXPORT void DeactivateWindow(aura::Window* window);
 ASH_EXPORT bool IsActiveWindow(aura::Window* window);
@@ skipping 24 matching lines @@
 
 // Minimizes |window|, which must not be NULL.
 ASH_EXPORT void MinimizeWindow(aura::Window* window);
 
 // Restores |window|, which must not be NULL.
 ASH_EXPORT void RestoreWindow(aura::Window* window);
 
 // Moves the window to the center of the display.
 ASH_EXPORT void CenterWindow(aura::Window* window);
 
+// Recreates a fresh layer for |window| and all its child windows. Does not
+// recreate shadows or other non-window layers. Returns the old layer and its
+// children, maintaining the hierarchy.
+ASH_EXPORT ui::Layer* RecreateWindowLayers(aura::Window* window);
+
+// Deletes |layer| and all its child layers.
+ASH_EXPORT void DeepDeleteLayers(ui::Layer* layer);
+
 }  // namespace wm
 }  // namespace ash
 
 #endif  // ASH_WM_WINDOW_UTIL_H_