BookmarkClient can add extra nodes to BookmarkModel.

components/bookmarks/browser/bookmark_client.cc

 // 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.
 
 #include "components/bookmarks/browser/bookmark_client.h"
 
 #include "base/logging.h"
 
 bool BookmarkClient::PreferTouchIcon() {
   return false;
@@ skipping 10 matching lines @@
 
 bool BookmarkClient::SupportsTypedCountForNodes() {
   return false;
 }
 
 void BookmarkClient::GetTypedCountForNodes(
     const NodeSet& nodes,
     NodeTypedCountPairs* node_typed_count_pairs) {
   NOTREACHED();
 }
+
+std::string BookmarkClient::GetManagedBookmarksDomain() {
+  return std::string();
+}