Refactor BrowsingHistoryHandler, create BrowsingHistoryService

chrome/browser/history/browsing_history_service_handler.h

+// Copyright 2016 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 CHROME_BROWSER_HISTORY_BROWSING_HISTORY_SERVICE_HANDLER_H_
+#define CHROME_BROWSER_HISTORY_BROWSING_HISTORY_SERVICE_HANDLER_H_
+
+#include "chrome/browser/history/browsing_history_service.h"
+
+// Interface for handling calls from the BrowsingHistoryService.
+class BrowsingHistoryServiceHandler {
+ public:
+  // Callback for QueryHistory().
+  virtual void OnQueryComplete(
+      std::vector<BrowsingHistoryService::HistoryEntry>* results,
+      BrowsingHistoryService::QueryResultsInfo* query_results_info) = 0;
+
+  // Callback for RemoveVisits().
+  virtual void OnRemoveVisitsComplete() = 0;
+
+  // Callback for RemoveVisits() that fails.
+  virtual void OnRemoveVisitsFailed() = 0;
+
+  // Called when HistoryService or WebHistoryService deletes one or more
+  // items.
+  virtual void HistoryDeleted() = 0;
+
+  // Whether other forms of browsing history were found on the history
+  // service.
+  virtual void HasOtherFormsOfBrowsingHistory(
+      bool has_other_forms, bool has_synced_results) = 0;
+
+ protected:
+  BrowsingHistoryServiceHandler() {}
+
+  DISALLOW_COPY_AND_ASSIGN(BrowsingHistoryServiceHandler);
+};
+
+#endif  // CHROME_BROWSER_HISTORY_BROWSING_HISTORY_SERVICE_HANDLER_H_