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

ash/wm/workspace/workspace_window_resizer.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/workspace/workspace_window_resizer.h"
 
 #include <algorithm>
 #include <cmath>
 #include <utility>
 #include <vector>
@@ skipping 15 matching lines @@
 #include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_delegate.h"
 #include "ui/base/hit_test.h"
 #include "ui/compositor/layer.h"
 #include "ui/gfx/screen.h"
 #include "ui/gfx/transform.h"
 
 namespace ash {
 
-scoped_ptr<WindowResizer> CreateWindowResizer(aura::Window* window,
+scoped_ptr<WindowResizer> CreateWindowResizer(WindowResizerOwner* owner,
+                                              aura::Window* window,
                                               const gfx::Point& point_in_parent,
                                               int window_component) {
   DCHECK(window);
   // No need to return a resizer when the window cannot get resized.
   if (!wm::CanResizeWindow(window) && window_component != HTCAPTION)
     return scoped_ptr<WindowResizer>();
 
   WindowResizer* window_resizer = NULL;
   if (window->type() == aura::client::WINDOW_TYPE_PANEL) {
     window_resizer = PanelWindowResizer::Create(
-        window, point_in_parent, window_component);
+        owner, window, point_in_parent, window_component);
   } else if (window->parent() &&
       window->parent()->id() == internal::kShellWindowId_WorkspaceContainer) {
     // Allow dragging maximized windows if it's not tracked by workspace. This
     // is set by tab dragging code.
     if (!wm::IsWindowNormal(window) &&
         (window_component != HTCAPTION || GetTrackedByWorkspace(window)))
       return scoped_ptr<WindowResizer>();
     window_resizer = internal::WorkspaceWindowResizer::Create(
         window,
         point_in_parent,
@@ skipping 768 matching lines @@
   gfx::Rect area(ScreenAsh::GetDisplayBoundsInParent(window()));
   if (location.x() <= area.x())
     return SNAP_LEFT_EDGE;
   if (location.x() >= area.right() - 1)
     return SNAP_RIGHT_EDGE;
   return SNAP_NONE;
 }
 
 }  // namespace internal
 }  // namespace ash