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diff --git a/content/browser/web_contents/web_drag_dest_gtk.h b/content/browser/web_contents/web_drag_dest_gtk.h
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+++ b/content/browser/web_contents/web_drag_dest_gtk.h
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+// 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 CONTENT_BROWSER_WEB_CONTENTS_WEB_DRAG_DEST_GTK_H_
+#define CONTENT_BROWSER_WEB_CONTENTS_WEB_DRAG_DEST_GTK_H_
+#pragma once
+
+#include <gtk/gtk.h>
+
+#include "base/gtest_prod_util.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "content/common/content_export.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebDragOperation.h"
+#include "ui/base/gtk/gtk_signal.h"
+#include "webkit/glue/webdropdata.h"
+
+namespace content {
+
+class RenderViewHostImpl;
+class WebContents;
+class WebDragDestDelegate;
+
+// A helper class that handles DnD for drops in the renderer. In GTK parlance,
+// this handles destination-side DnD, but not source-side DnD.
+class CONTENT_EXPORT WebDragDestGtk {
+ public:
+  WebDragDestGtk(WebContents* web_contents, GtkWidget* widget);
+  ~WebDragDestGtk();
+
+  // This is called when the renderer responds to a drag motion event. We must
+  // update the system drag cursor.
+  void UpdateDragStatus(WebKit::WebDragOperation operation);
+
+  // Informs the renderer when a system drag has left the render view.
+  // See OnDragLeave().
+  void DragLeave();
+
+  WebDragDestDelegate* delegate() const { return delegate_; }
+  void set_delegate(WebDragDestDelegate* delegate) { delegate_ = delegate; }
+
+ private:
+  content::RenderViewHostImpl* GetRenderViewHost() const;
+
+  // Called when a system drag crosses over the render view. As there is no drag
+  // enter event, we treat it as an enter event (and not a regular motion event)
+  // when |context_| is NULL.
+  CHROMEGTK_CALLBACK_4(WebDragDestGtk, gboolean, OnDragMotion, GdkDragContext*,
+                       gint, gint, guint);
+
+  // We make a series of requests for the drag data when the drag first enters
+  // the render view. This is the callback that is used to give us the data
+  // for each individual target. When |data_requests_| reaches 0, we know we
+  // have attained all the data, and we can finally tell the renderer about the
+  // drag.
+  CHROMEGTK_CALLBACK_6(WebDragDestGtk, void, OnDragDataReceived,
+                       GdkDragContext*, gint, gint, GtkSelectionData*,
+                       guint, guint);
+
+  // The drag has left our widget; forward this information to the renderer.
+  CHROMEGTK_CALLBACK_2(WebDragDestGtk, void, OnDragLeave, GdkDragContext*,
+                       guint);
+
+  // Called by GTK when the user releases the mouse, executing a drop.
+  CHROMEGTK_CALLBACK_4(WebDragDestGtk, gboolean, OnDragDrop, GdkDragContext*,
+                       gint, gint, guint);
+
+  WebContents* web_contents_;
+
+  // The render view.
+  GtkWidget* widget_;
+
+  // The current drag context for system drags over our render view, or NULL if
+  // there is no system drag or the system drag is not over our render view.
+  GdkDragContext* context_;
+
+  // The data for the current drag, or NULL if |context_| is NULL.
+  scoped_ptr<WebDropData> drop_data_;
+
+  // The number of outstanding drag data requests we have sent to the drag
+  // source.
+  int data_requests_;
+
+  // The last time we sent a message to the renderer related to a drag motion.
+  gint drag_over_time_;
+
+  // Whether the cursor is over a drop target, according to the last message we
+  // got from the renderer.
+  bool is_drop_target_;
+
+  // Handler ID for the destroy signal handler. We connect to the destroy
+  // signal handler so that we won't call dest_unset on it after it is
+  // destroyed, but we have to cancel the handler if we are destroyed before
+  // |widget_| is.
+  int destroy_handler_;
+
+  // A delegate that can receive drag information about drag events.
+  WebDragDestDelegate* delegate_;
+
+  base::WeakPtrFactory<WebDragDestGtk> method_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebDragDestGtk);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_DRAG_DEST_GTK_H_