[Offline Pages] Create a event/activity logger

components/offline_pages/stub_offline_page_model.cc

Index: components/offline_pages/stub_offline_page_model.cc
diff --git a/components/offline_pages/stub_offline_page_model.cc b/components/offline_pages/stub_offline_page_model.cc
index ba9f5b2b313c3ef3b19c4ba29c32f7796a111f6a..8dad0fcbf4620c3e6d0e3f8d8de4003c99d6fefe 100644
--- a/components/offline_pages/stub_offline_page_model.cc
+++ b/components/offline_pages/stub_offline_page_model.cc
@@ -74,5 +74,7 @@ ClientPolicyController* StubOfflinePageModel::GetPolicyController() {
 bool StubOfflinePageModel::is_loaded() const {
   return true;
 }
-
+OfflineEventLogger* GetLogger() {
+  return nullptr;
+}
 }  // namespace offline_pages