Attach panel while dragging to bring it in front of other panels.

ash/wm/drag_window_resizer_unittest.cc

 // 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.
 
 #include "ash/wm/drag_window_resizer.h"
 
 #include "ash/display/mouse_cursor_event_filter.h"
 #include "ash/root_window_controller.h"
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shell.h"
@@ skipping 88 matching lines @@
 
   internal::ShelfLayoutManager* shelf_layout_manager() {
     return Shell::GetPrimaryRootWindowController()->GetShelfLayoutManager();
   }
 
   static DragWindowResizer* CreateDragWindowResizer(
       aura::Window* window,
       const gfx::Point& point_in_parent,
       int window_component) {
     return static_cast<DragWindowResizer*>(CreateWindowResizer(
-        window, point_in_parent, window_component).release());
+        NULL, window, point_in_parent, window_component).release());

[stevenjb, 2013/03/13 19:31:39]

NULL /* owner */

   }
 
   aura::test::TestWindowDelegate delegate_;
   aura::test::TestWindowDelegate delegate2_;
   aura::test::TestWindowDelegate delegate3_;
   aura::test::TestWindowDelegate delegate4_;
   aura::test::TestWindowDelegate delegate5_;
 
   scoped_ptr<aura::Window> window_;
   scoped_ptr<aura::Window> always_on_top_window_;
@@ skipping 355 matching lines @@
     ASSERT_TRUE(resizer.get());
     resizer->Drag(CalculateDragPoint(*resizer, 399, 200), 0);
     EXPECT_TRUE(event_filter->WarpMouseCursorIfNecessary(root_windows[0],
                                                          gfx::Point(399, 200)));
     resizer->CompleteDrag(0);
   }
 }
 
 }  // namespace internal
 }  // namespace ash