[Offline Pages] Create a event/activity logger

components/offline_pages/offline_page_model_impl.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_PAGE_MODEL_IMPL_H_
 #define COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_MODEL_IMPL_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 31 matching lines @@
 
 static const int64_t kInvalidOfflineId = 0;
 
 struct ClientId;
 struct OfflinePageItem;
 
 class ArchiveManager;
 class ClientPolicyController;
 class OfflinePageMetadataStore;
 class OfflinePageStorageManager;
+class OfflinePageModelEventLogger;
 
 // Implementation of service for saving pages offline, storing the offline
 // copy and metadata, and retrieving them upon request.
 class OfflinePageModelImpl : public OfflinePageModel, public KeyedService {
  public:
   // All blocking calls/disk access will happen on the provided |task_runner|.
   OfflinePageModelImpl(
       std::unique_ptr<OfflinePageMetadataStore> store,
       const base::FilePath& archives_dir,
       const scoped_refptr<base::SequencedTaskRunner>& task_runner);
@@ skipping 47 matching lines @@
                    const base::Callback<void(bool)>& callback) override;
   ClientPolicyController* GetPolicyController() override;
 
   // Methods for testing only:
   OfflinePageMetadataStore* GetStoreForTesting();
 
   OfflinePageStorageManager* GetStorageManager();
 
   bool is_loaded() const override;
 
+  void GetLogs(std::vector<std::string>& storage_vector) override;
+  void SetIsLogging(bool should_log) override;
+
  protected:
   // Adding a protected constructor for testing-only purposes in
   // offline_page_storage_manager_unittest.cc
   OfflinePageModelImpl();
 
  private:
   FRIEND_TEST_ALL_PREFIXES(OfflinePageModelImplTest, MarkPageForDeletion);
 
   typedef ScopedVector<OfflinePageArchiver> PendingArchivers;
 
@@ skipping 137 matching lines @@
   // Controller of the client policies.
   std::unique_ptr<ClientPolicyController> policy_controller_;
 
   // Manager for the storage consumed by archives and responsible for
   // automatic page clearing.
   std::unique_ptr<OfflinePageStorageManager> storage_manager_;
 
   // Manager for the offline archive files and directory.
   std::unique_ptr<ArchiveManager> archive_manager_;
 
+  // Logger to facilitate recording of events.
+  OfflinePageModelEventLogger offline_event_logger_;
+
   base::WeakPtrFactory<OfflinePageModelImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(OfflinePageModelImpl);
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_MODEL_IMPL_H_