[Offline Pages] Create a event/activity logger

components/offline_pages/stub_offline_page_model.cc

 // 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.
 
 #include "components/offline_pages/stub_offline_page_model.h"
 
 namespace offline_pages {
 
 StubOfflinePageModel::StubOfflinePageModel() {}
 StubOfflinePageModel::~StubOfflinePageModel() {}
@@ skipping 56 matching lines @@
 void StubOfflinePageModel::ExpirePages(
     const std::vector<int64_t>& offline_ids,
     const base::Time& expiration_time,
     const base::Callback<void(bool)>& callback) {}
 ClientPolicyController* StubOfflinePageModel::GetPolicyController() {
   return nullptr;
 }
 bool StubOfflinePageModel::is_loaded() const {
   return true;
 }
-
+OfflineEventLogger* GetLogger() {
+  return nullptr;
+}
 }  // namespace offline_pages