Support Drag and Drop across displays.

ash/drag_drop/drag_image_view.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/drag_drop/drag_image_view.h"
 
 #include "ash/wm/shadow_types.h"
+#include "ui/aura/window.h"
 #include "ui/views/widget/widget.h"
 
 namespace ash {
 namespace internal {
 
 namespace {
 using views::Widget;
 
 Widget* CreateDragWidget() {
   Widget* drag_widget = new Widget;
   Widget::InitParams params;
   params.type = Widget::InitParams::TYPE_TOOLTIP;
   params.keep_on_top = true;
   params.accept_events = false;
   params.ownership = Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
   params.transparent = true;
   drag_widget->Init(params);
   drag_widget->SetOpacity(0xFF);
+  drag_widget->GetNativeWindow()->set_owned_by_parent(false);
   SetShadowType(drag_widget->GetNativeView(), SHADOW_TYPE_NONE);
   return drag_widget;
 }
 }
 
 DragImageView::DragImageView() : views::ImageView() {
   widget_.reset(CreateDragWidget());
   widget_->SetContentsView(this);
   widget_->SetAlwaysOnTop(true);
 
@@ skipping 17 matching lines @@
   if (visible != widget_->IsVisible()) {
     if (visible)
       widget_->Show();
     else
       widget_->Hide();
   }
 }
 
 }  // namespace internal
 }  // namespace ash