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

ash/wm/workspace/workspace_window_resizer.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_WORKSPACE_WINDOW_RESIZER_H_
 #define ASH_WM_WORKSPACE_WINDOW_RESIZER_H_
 
 #include <vector>
 
 #include "ash/wm/window_resizer.h"
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
 
 namespace aura {
 class RootWindow;
 }  // namespace aura
 
+namespace ui {
+class Layer;
+}  // namespace ui
+
 namespace ash {
 namespace internal {
 
 class PhantomWindowController;
 class SnapSizer;
 
 // WindowResizer implementation for workspaces. This enforces that windows are
 // not allowed to vertically move or resize outside of the work area. As windows
 // are moved outside the work area they are shrunk. We remember the height of
 // the window before it was moved so that if the window is again moved up we
@@ skipping 96 matching lines @@
   // top of the z-order, and the rest directly underneath it.
   void RestackWindows();
 
   // Returns the SnapType for the specified point. SNAP_NONE is used if no
   // snapping should be used.
   SnapType GetSnapType(const gfx::Point& location) const;
 
   // Returns true if we should allow the mouse pointer to warp.
   bool ShouldAllowMouseWarp() const;
 
+  // Recreates a fresh layer for window() and all its child windows.
+  void RecreateWindowLayers();
+
   aura::Window* window() const { return details_.window; }
 
   const Details details_;
 
   const std::vector<aura::Window*> attached_windows_;
 
   // Set to true once Drag() is invoked and the bounds of the window change.
   bool did_move_or_resize_;
 
   // The initial size of each of the windows in |attached_windows_| along the
@@ skipping 34 matching lines @@
   SnapType snap_type_;
 
   // Number of mouse moves since the last bounds change. Only used for phantom
   // placement to track when the mouse is moved while pushed against the edge of
   // the screen.
   int num_mouse_moves_since_bounds_change_;
 
   // The mouse location passed to Drag().
   gfx::Point last_mouse_location_;
 
+  // The copy of window()->layer() and its children. This object is the owner of
+  // the layer.
+  ui::Layer* layer_;
+
   DISALLOW_COPY_AND_ASSIGN(WorkspaceWindowResizer);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_WORKSPACE_WINDOW_RESIZER_H_