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diff --git a/content/browser/web_contents/web_drag_source_win.h b/content/browser/web_contents/web_drag_source_win.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 CONTENT_BROWSER_WEB_CONTENTS_WEB_DRAG_SOURCE_WIN_H_
+#define CONTENT_BROWSER_WEB_CONTENTS_WEB_DRAG_SOURCE_WIN_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+#include "ui/base/dragdrop/drag_source.h"
+#include "ui/gfx/native_widget_types.h"
+#include "ui/gfx/point.h"
+
+namespace content {
+class RenderViewHost;
+class WebContents;
+}
+
+// An IDropSource implementation for a TabContents. Handles notifications sent
+// by an active drag-drop operation as the user mouses over other drop targets
+// on their system. This object tells Windows whether or not the drag should
+// continue, and supplies the appropriate cursors.
+class WebDragSource : public ui::DragSource,
+                      public content::NotificationObserver {
+ public:
+  // Create a new DragSource for a given HWND and WebContents.
+  WebDragSource(gfx::NativeWindow source_wnd,
+                content::WebContents* web_contents);
+  virtual ~WebDragSource();
+
+  // content::NotificationObserver implementation.
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details);
+
+  void set_effect(DWORD effect) { effect_ = effect; }
+
+ protected:
+  // ui::DragSource
+  virtual void OnDragSourceCancel();
+  virtual void OnDragSourceDrop();
+  virtual void OnDragSourceMove();
+
+ private:
+  // Cannot construct thusly.
+  WebDragSource();
+
+  // OnDragSourceDrop schedules its main work to be done after IDropTarget::Drop
+  // by posting a task to this function.
+  void DelayedOnDragSourceDrop();
+
+  // Keep a reference to the window so we can translate the cursor position.
+  gfx::NativeWindow source_wnd_;
+
+  // We use this as a channel to the renderer to tell it about various drag
+  // drop events that it needs to know about (such as when a drag operation it
+  // initiated terminates).
+  content::RenderViewHost* render_view_host_;
+
+  content::NotificationRegistrar registrar_;
+
+  DWORD effect_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebDragSource);
+};
+
+#endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_DRAG_SOURCE_WIN_H_