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diff --git a/ui/wm/public/scoped_drag_drop_disabler.h b/ui/wm/public/scoped_drag_drop_disabler.h
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+++ b/ui/wm/public/scoped_drag_drop_disabler.h
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+// Copyright 2015 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_SCOPED_DRAG_DROP_DISABLER_H_
+#define UI_WM_PUBLIC_SCOPED_DRAG_DROP_DISABLER_H_
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "ui/aura/window_observer.h"
+
+namespace aura {
+class Window;
+
+namespace client {
+class DragDropClient;
+
+// ScopedDragDropDisabler is used to temporarily replace the drag'n'drop client
+// for a window with a "no-op" client. Upon construction, it installs a new
+// client on the window, and upon destruction, it restores the previous one.
+class AURA_EXPORT ScopedDragDropDisabler : public WindowObserver {
+ public:
+  explicit ScopedDragDropDisabler(Window* window);
+  ~ScopedDragDropDisabler() override;
+
+ private:
+  // WindowObserver:
+  void OnWindowDestroyed(Window* window) override;
+
+  Window* window_;
+  DragDropClient* old_client_;
+  scoped_ptr<DragDropClient> new_client_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedDragDropDisabler);
+};
+
+}  // namespace client
+}  // namespace aura
+
+#endif  // UI_WM_PUBLIC_SCOPED_DRAG_DROP_DISABLER_H_