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. Defined in
-// offline_event_logger.cc.
-extern const size_t kMaxLogCount;
-
-// 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:
-  // This client interface should be implemented by the class which provides the
-  // ability to pipe the log somewhere else (Eg. a java class which can write
-  // logs into a file). It's optional and uses SetClient() to attach the client
-  // to the event logger instance.
-  class Client {
-   public:
-    virtual ~Client(){};
-    virtual void CustomLog(const std::string& message) = 0;
-  };
-
-  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);
-
-  // Write the activity into the cycling log if we are currently logging.
-  void RecordActivity(const std::string& activity);
-
-  // Sets the client for custom logging process if needed.
-  void SetClient(Client* client);
-
- private:
-  // Recorded offline page activities.
-  std::deque<std::string> activities_;
-
-  // Whether we are currently recording logs or not.
-  bool is_logging_;
-
-  // Not owned.
-  Client* client_;
-};
-}  // namespace offline_pages
-
-#endif  // COMPONENTS_OFFLINE_PAGES_OFFLINE_EVENT_LOGGER_H_