[Offline Pages] Create a event/activity logger

components/offline_pages/offline_page_model_impl.h

Index: components/offline_pages/offline_page_model_impl.h
diff --git a/components/offline_pages/offline_page_model_impl.h b/components/offline_pages/offline_page_model_impl.h
index 11769ee919fd4c47f7cea81fca071f3ebde3e8c2..35a2f8ce2b9f439ac5207a9947fd3c396dc7f3a4 100644
--- a/components/offline_pages/offline_page_model_impl.h
+++ b/components/offline_pages/offline_page_model_impl.h
@@ -49,6 +49,7 @@ 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.
@@ -116,6 +117,9 @@ class OfflinePageModelImpl : public OfflinePageModel, public KeyedService {
 
   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
@@ -273,6 +277,9 @@ class OfflinePageModelImpl : public OfflinePageModel, public KeyedService {
   // 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);