Abstract code filtering URLs added to the history

components/history/core/browser/history_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/history/core/browser/history_client.h"
 
 namespace history {
 
 HistoryClient::HistoryClient() {
 }
 
 void HistoryClient::BlockUntilBookmarksLoaded() {
 }
 
 bool HistoryClient::IsBookmarked(const GURL& url) {
   return false;
 }
 
 void HistoryClient::GetBookmarks(std::vector<URLAndTitle>* bookmarks) {
 }
 
+bool HistoryClient::CanAddURL(const GURL& url) {
+  return true;
+}
+
 void HistoryClient::NotifyProfileError(sql::InitStatus init_status) {
 }
 
 bool HistoryClient::ShouldReportDatabaseError() {
   return false;
 }
 
 void HistoryClient::OnHistoryBackendInitialized(
     HistoryBackend* history_backend,
     HistoryDatabase* history_database,
     ThumbnailDatabase* thumbnail_database,
     const base::FilePath& history_dir) {
 }
 
 void HistoryClient::OnHistoryBackendDestroyed(
     HistoryBackend* history_backend,
     const base::FilePath& history_dir) {
 }
 
 }  // namespace history