Moves DragDropClient to aura/client

ui/wm/public/drag_drop_client.h

-// 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.
-
-#ifndef UI_WM_PUBLIC_DRAG_DROP_CLIENT_H_
-#define UI_WM_PUBLIC_DRAG_DROP_CLIENT_H_
-
-#include "ui/aura/aura_export.h"
-#include "ui/base/dragdrop/drag_drop_types.h"
-#include "ui/gfx/native_widget_types.h"
-
-namespace gfx {
-class Point;
-}
-
-namespace ui {
-class LocatedEvent;
-class OSExchangeData;
-}
-
-namespace aura {
-class Window;
-namespace client {
-
-// An interface implemented by an object that controls a drag and drop session.
-class AURA_EXPORT DragDropClient {
- public:
-  virtual ~DragDropClient() {}
-
-  // Initiates a drag and drop session. Returns the drag operation that was
-  // applied at the end of the drag drop session. |screen_location| is in
-  // screen coordinates.
-  virtual int StartDragAndDrop(const ui::OSExchangeData& data,
-                               aura::Window* root_window,
-                               aura::Window* source_window,
-                               const gfx::Point& screen_location,
-                               int operation,
-                               ui::DragDropTypes::DragEventSource source) = 0;
-
-  // Called when mouse is dragged during a drag and drop.
-  virtual void DragUpdate(aura::Window* target,
-                          const ui::LocatedEvent& event) = 0;
-
-  // Called when mouse is released during a drag and drop.
-  virtual void Drop(aura::Window* target,
-                    const ui::LocatedEvent& event) = 0;
-
-  // Called when a drag and drop session is cancelled.
-  virtual void DragCancel() = 0;
-
-  // Returns true if a drag and drop session is in progress.
-  virtual bool IsDragDropInProgress() = 0;
-};
-
-AURA_EXPORT void SetDragDropClient(Window* root_window,
-                                   DragDropClient* client);
-AURA_EXPORT DragDropClient* GetDragDropClient(Window* root_window);
-
-}  // namespace client
-}  // namespace aura
-
-#endif  // UI_WM_PUBLIC_DRAG_DROP_CLIENT_H_