mac: Fix bookmark drag and drop.

components/bookmarks/browser/bookmark_pasteboard_helper_mac.h

 // Copyright 2014 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 COMPONENTS_BOOKMARKS_BROWSER_BOOKMARK_PASTEBOARD_HELPER_MAC_H_
 #define COMPONENTS_BOOKMARKS_BROWSER_BOOKMARK_PASTEBOARD_HELPER_MAC_H_
 
 #include "components/bookmarks/browser/bookmark_node_data.h"
 
 #if defined(__OBJC__)
+@class NSPasteboardItem;
 @class NSString;
 #endif  // __OBJC__
 
 namespace base {
 class FilePath;
 }
 
 namespace bookmarks {
 
 // This set of functions lets C++ code interact with the cocoa pasteboard and
 // dragging methods.
 
+#if defined(__OBJC__)
+// Creates a NSPasteboardItem that contains all the data for the bookmarks.
+NSPasteboardItem* PasteboardItemFromBookmarks(
+    const std::vector<BookmarkNodeData::Element>& elements,
+    const base::FilePath& profile_path);
+#endif  // __OBJC__
+
 // Writes a set of bookmark elements from a profile to the specified pasteboard.
 void WriteBookmarksToPasteboard(
     ui::ClipboardType type,
     const std::vector<BookmarkNodeData::Element>& elements,
     const base::FilePath& profile_path);
 
 // Reads a set of bookmark elements from the specified pasteboard.
 bool ReadBookmarksFromPasteboard(
     ui::ClipboardType type,
     std::vector<BookmarkNodeData::Element>& elements,
     base::FilePath* profile_path);
 
 // Returns true if the specified pasteboard contains any sort of bookmark
 // elements. It currently does not consider a plaintext url a valid bookmark.
 bool PasteboardContainsBookmarks(ui::ClipboardType type);
 
 }  // namespace bookmarks
 
 #if defined(__OBJC__)
 // Pasteboard type for dictionary containing bookmark structure consisting
 // of individual bookmark nodes and/or bookmark folders.
 extern "C" NSString* const kBookmarkDictionaryListPboardType;
 #endif  // __OBJC__
 
 #endif  // COMPONENTS_BOOKMARKS_BROWSER_BOOKMARK_PASTEBOARD_HELPER_MAC_H_