First shot at implementing drag&drop for Aura

ui/aura_shell/drag_image_view.h

Index: ui/aura_shell/drag_image_view.h
diff --git a/ui/aura_shell/drag_image_view.h b/ui/aura_shell/drag_image_view.h
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+++ b/ui/aura_shell/drag_image_view.h
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+// Copyright (c) 2011 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 UI_AURA_SHELL_DRAG_IMAGE_VIEW_H_
+#define UI_AURA_SHELL_DRAG_IMAGE_VIEW_H_
+#pragma once
+
+#include "views/controls/image_view.h"
+
+namespace views {
+class Widget;
+}
+
+namespace aura_shell {
+namespace internal {
+
+class DragImageView : public views::ImageView {
+ public:
+  DragImageView();
+  virtual ~DragImageView();
+
+  // Sets the bounds of the native widget.
+  void SetScreenBounds(const gfx::Rect& bounds);
+
+  // Sets the position of the native widget.
+  void SetScreenPosition(const gfx::Point& position);
+
+  // Sets the visibility of the native widget.
+  void SetWidgetVisible(bool visible);
+
+ private:
+  scoped_ptr<views::Widget> widget_;
+
+  DISALLOW_COPY_AND_ASSIGN(DragImageView);
+};
+
+}  // namespace internal
+}  // namespace aura_shell
+
+#endif  // UI_AURA_SHELL_DRAG_IMAGE_VIEW_H_