GTK: implement extension bookmark manager drag api....

chrome/browser/tab_contents/web_drag_dest_gtk.h

 // Copyright (c) 2009 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 CHROME_BROWSER_TAB_CONTENTS_WEB_DRAG_DEST_GTK_H_
 #define CHROME_BROWSER_TAB_CONTENTS_WEB_DRAG_DEST_GTK_H_
 
 #include <gtk/gtk.h>
+#include <vector>
 
 #include "app/gtk_signal.h"
 #include "base/scoped_ptr.h"
 #include "base/task.h"
+#include "chrome/browser/bookmarks/bookmark_drag_data.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebDragOperation.h"
 #include "webkit/glue/webdropdata.h"
 
+class BookmarkNode;
 class TabContents;
 
 // 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 WebDragDestGtk {
  public:
   WebDragDestGtk(TabContents* tab_contents, GtkWidget* widget);
   ~WebDragDestGtk();
 
   // This is called when the renderer responds to a drag motion event. We must
@@ skipping 47 matching lines @@
   // 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_;
 
+  // The bookmark data for the current tab. This will be empty if there is not
+  // a native bookmark drag (or we haven't gotten the data from the source yet).
+  BookmarkDragData bookmark_drag_data_;
+
   ScopedRunnableMethodFactory<WebDragDestGtk> method_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebDragDestGtk);
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_WEB_DRAG_DEST_GTK_H_