Only assign enhanced bookmarks metainfo ID if not already present

chrome/browser/extensions/api/bookmarks/bookmarks_api.cc

 // 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.
 
 #include <algorithm>
 
 #include "chrome/browser/extensions/api/bookmarks/bookmarks_api.h"
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
@@ skipping 337 matching lines @@
 }
 
 void BookmarkEventRouter::OnWillAddBookmarkNode(BookmarkModel* model,
                                                 BookmarkNode* node) {
   // TODO(wittman): Remove this once extension hooks are in place to allow the
   // enhanced bookmarks extension to manage all bookmark creation code
   // paths. See http://crbug.com/383557.
   if (IsEnhancedBookmarksExtensionActive(Profile::FromBrowserContext(
           browser_context_))) {
     static const char key[] = "stars.id";
-    node->SetMetaInfo(key, GenerateEnhancedBookmarksID(node->is_folder()));
+    std::string value;
+    if (!node->GetMetaInfo(key, &value))
+      node->SetMetaInfo(key, GenerateEnhancedBookmarksID(node->is_folder()));
   }
 }
 
 void BookmarkEventRouter::BookmarkNodeAdded(BookmarkModel* model,
                                             const BookmarkNode* parent,
                                             int index) {
   const BookmarkNode* node = parent->GetChild(index);
   scoped_ptr<BookmarkTreeNode> tree_node(
       bookmark_api_helpers::GetBookmarkTreeNode(client_, node, false, false));
   DispatchEvent(bookmarks::OnCreated::kEventName,
@@ skipping 743 matching lines @@
 #if !defined(OS_ANDROID)
   // Android does not have support for the standard exporter.
   // TODO(jgreenwald): remove ifdef once extensions are no longer built on
   // Android.
   bookmark_html_writer::WriteBookmarks(GetProfile(), path, NULL);
 #endif
   Release();  // Balanced in BookmarksIOFunction::SelectFile()
 }
 
 }  // namespace extensions