a few minor tweaks the bookmarks API:...

chrome/browser/extensions/extension_bookmarks_module_constants.cc

 // 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.
 
 #include "chrome/browser/extensions/extension_bookmarks_module_constants.h"
 
 namespace extension_bookmarks_module_constants {
 
 const wchar_t kIdKey[] = L"id";
 const wchar_t kIndexKey[] = L"index";
 const wchar_t kParentIdKey[] = L"parentId";
 const wchar_t kOldIndexKey[] = L"oldIndex";
 const wchar_t kOldParentIdKey[] = L"oldParentId";
 const wchar_t kUrlKey[] = L"url";
 const wchar_t kTitleKey[] = L"title";
-const wchar_t kChildrenKey[] = L"childrenIds";
+const wchar_t kChildrenKey[] = L"children";
 const wchar_t kRecursiveKey[] = L"recursive";
+const wchar_t kDateAddedKey[] = L"dateAdded";
+const wchar_t kDateGroupModifiedKey[] = L"dateGroupModified";
 
 const char kNoNodeError[] = "Can't find bookmark for id.";
 const char kNoParentError[] = "Can't find parent bookmark for id.";
 const char kFolderNotEmptyError[] =
     "Can't remove non-empty folder (use recursive to force).";
 const char kInvalidIndexError[] = "Index out of bounds.";
 const char kInvalidUrlError[] = "Invalid URL.";
 const char kModifySpecialError[] = "Can't modify the root bookmark folders.";
 
 const char kOnBookmarkAdded[] = "bookmark-added";
 const char kOnBookmarkRemoved[] = "bookmark-removed";
 const char kOnBookmarkChanged[] = "bookmark-changed";
 const char kOnBookmarkMoved[] = "bookmark-moved";
 const char kOnBookmarkChildrenReordered[] = "bookmark-children-reordered";
 
 const char kGetBookmarksFunction[] = "GetBookmarks";
 const char kGetBookmarkChildrenFunction[] = "GetBookmarkChildren";
 const char kGetBookmarkTreeFunction[] = "GetBookmarkTree";
 const char kSearchBookmarksFunction[] = "SearchBookmarks";
 const char kRemoveBookmarkFunction[] = "RemoveBookmark";
 const char kCreateBookmarkFunction[] = "CreateBookmark";
 const char kMoveBookmarkFunction[] = "MoveBookmark";
 const char kSetBookmarkTitleFunction[] = "SetBookmarkTitle";
 
 }  // namespace extension_bookmarks_module_constants