[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..fc84bc17e6546f0b707529684529aea899b94bab 100644
--- a/components/offline_pages/offline_page_model_impl.h
+++ b/components/offline_pages/offline_page_model_impl.h
@@ -27,6 +27,7 @@
 #include "components/offline_pages/offline_page_archiver.h"
 #include "components/offline_pages/offline_page_metadata_store.h"
 #include "components/offline_pages/offline_page_model.h"
+#include "components/offline_pages/offline_page_model_event_logger.h"
 #include "components/offline_pages/offline_page_storage_manager.h"
 #include "components/offline_pages/offline_page_types.h"
 
@@ -116,6 +117,8 @@ class OfflinePageModelImpl : public OfflinePageModel, public KeyedService {
 
   bool is_loaded() const override;
 
+  OfflineEventLogger* GetLogger() override;
+
  protected:
   // Adding a protected constructor for testing-only purposes in
   // offline_page_storage_manager_unittest.cc
@@ -273,6 +276,9 @@ 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);