Move all components/offline_pages/ files into component/offline_pages/core

components/offline_pages/offline_event_logger.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 COMPONENTS_OFFLINE_PAGES_OFFLINE_EVENT_LOGGER_H_
-#define COMPONENTS_OFFLINE_PAGES_OFFLINE_EVENT_LOGGER_H_
-
-#include <deque>
-#include <string>
-#include <vector>
-
-#include "base/macros.h"
-
-namespace offline_pages {
-
-// Maximum number of recorded Logs to keep track of at any moment.
-static const size_t kMaxLogCount = 50;
-
-// Facilitates the logging of events. Subclasses should create methods that
-// call RecordActivity to write into the log. |SetIsLogging|, |GetLogs|, and
-// |Clear| are called from the chrome://offline-internals page.
-//
-// Logging should be done by calling the corresponding subclass methods when
-// a loggable event occurs (i.e. when status has changed for a save request
-// or when an offlined page has been accessed/saved).
-//
-// This log only keeps track of the last |kMaxLogCount| events.
-class OfflineEventLogger {
- public:
-  OfflineEventLogger();
-
-  ~OfflineEventLogger();
-
-  // Clears the recorded activities.
-  void Clear();
-
-  // Turns logging on/off.
-  void SetIsLogging(bool is_logging);
-
-  // Returns whether we are currently logging.
-  bool GetIsLogging();
-
-  // Dumps the current activity list into |records|.
-  void GetLogs(std::vector<std::string>* records);
-
- protected:
-  // Write the activity into the cycling log if we are currently logging.
-  void RecordActivity(const std::string& activity);
-
- private:
-  // Recorded offline page activities.
-  std::deque<std::string> activities_;
-
-  // Whether we are currently recording logs or not.
-  bool is_logging_;
-};
-}  // namespace offline_pages
-
-#endif  // COMPONENTS_OFFLINE_PAGES_OFFLINE_EVENT_LOGGER_H_