Minor Ash panel related cleanup

ash/wm/window_util.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/window_util.h"
 
 #include <vector>
 
 #include "ash/ash_constants.h"
 #include "ash/root_window_controller.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/activation_controller.h"
 #include "ash/wm/window_properties.h"
 #include "ui/aura/client/activation_client.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_delegate.h"
 #include "ui/compositor/layer.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/screen.h"
 #include "ui/views/corewm/window_util.h"
+#include "ui/views/view.h"
+#include "ui/views/widget/widget.h"
 
 namespace ash {
 namespace wm {
 
 // TODO(beng): replace many of these functions with the corewm versions.
 void ActivateWindow(aura::Window* window) {
   views::corewm::ActivateWindow(window);
 }
 
 void DeactivateWindow(aura::Window* window) {
@@ skipping 159 matching lines @@
     int x_offset = 0;
     if (work_area.right() < bounds->x()) {
       x_offset = work_area.right() - bounds->x() - min_width;
     } else if (bounds->right() < work_area.x()) {
       x_offset = work_area.x() - bounds->right() + min_width;
     }
     bounds->Offset(x_offset, y_offset);
   }
 }
 
+void MoveWindowToEventRoot(aura::Window* window, const ui::Event& event) {
+  views::View* target = static_cast<views::View*>(event.target());
+  if (!target)
+    return;
+  aura::RootWindow* target_root =
+      target->GetWidget()->GetNativeView()->GetRootWindow();
+  if (!target_root || target_root == window->GetRootWindow())
+    return;
+  aura::Window* window_container =
+      ash::Shell::GetContainer(target_root, window->parent()->id());
+  // Move the window to the target launcher.
+  window_container->AddChild(window);
+}
+
 }  // namespace wm
 }  // namespace ash