bookmarks: Extract PerformBookmarkDrop() function out of bookmark_utils.h

chrome/browser/ui/bookmarks/bookmark_drag_drop.h

 // Copyright 2013 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_UI_BOOKMARKS_BOOKMARK_DRAG_DROP_H_
 #define CHROME_BROWSER_UI_BOOKMARKS_BOOKMARK_DRAG_DROP_H_
 
 #include <vector>
 
 #include "ui/gfx/native_widget_types.h"
 
 class BookmarkNode;
+struct BookmarkNodeData;
 class Profile;
 
 namespace chrome {
 
 // Stars the process of dragging a folder of bookmarks.
 void DragBookmarks(Profile* profile,
                    const std::vector<const BookmarkNode*>& nodes,
                    gfx::NativeView view);
 
+// Drops the bookmark nodes that are in |data| onto |parent_node| at |index|.
+// Returns the drop type used.
+int DropBookmarks(Profile* profile,
+                  const BookmarkNodeData& data,
+                  const BookmarkNode* parent_node,
+                  int index);
+
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_UI_BOOKMARKS_BOOKMARK_DRAG_DROP_H_