[Offline pages] Splitting Add and Update methods in OPMStore

components/offline_pages/offline_page_test_store.h

Index: components/offline_pages/offline_page_test_store.h
diff --git a/components/offline_pages/offline_page_test_store.h b/components/offline_pages/offline_page_test_store.h
index 41a910383efd94fde95c72d9d63e14c2f194b101..7464bdd15e07d1e3077381cd13d131bf018c29cd 100644
--- a/components/offline_pages/offline_page_test_store.h
+++ b/components/offline_pages/offline_page_test_store.h
@@ -37,8 +37,10 @@ class OfflinePageTestStore : public OfflinePageMetadataStore {
 
   // OfflinePageMetadataStore overrides:
   void GetOfflinePages(const LoadCallback& callback) override;
-  void AddOrUpdateOfflinePage(const OfflinePageItem& offline_page,
-                              const UpdateCallback& callback) override;
+  void AddOfflinePage(const OfflinePageItem& offline_page,
+                      const AddCallback& callback) override;
+  void UpdateOfflinePages(const std::vector<OfflinePageItem>& pages,
+                          const UpdateCallback& callback) override;
   void RemoveOfflinePages(const std::vector<int64_t>& offline_ids,
                           const UpdateCallback& callback) override;
   void Reset(const ResetCallback& callback) override;