Add methods to Reading List Model

ios/chrome/browser/reading_list/reading_list_model_impl.h

Index: ios/chrome/browser/reading_list/reading_list_model_impl.h
diff --git a/ios/chrome/browser/reading_list/reading_list_model_impl.h b/ios/chrome/browser/reading_list/reading_list_model_impl.h
index d185c5193618190144f0d2e3de6541d1e11aaa52..c4c7430d35a64b9eb21fba7fc37d5c44ecca8444 100644
--- a/ios/chrome/browser/reading_list/reading_list_model_impl.h
+++ b/ios/chrome/browser/reading_list/reading_list_model_impl.h
@@ -49,6 +49,7 @@ class ReadingListModelImpl : public ReadingListModel, public KeyedService {
                                    const std::string& title) override;
 
   void MarkReadByURL(const GURL& url) override;
+  void MarkUnreadByURL(const GURL& url) override;
 
   void SetEntryTitle(const GURL& url, const std::string& title) override;
   void SetEntryDistilledURL(const GURL& url,
@@ -57,6 +58,8 @@ class ReadingListModelImpl : public ReadingListModel, public KeyedService {
       const GURL& url,
       ReadingListEntry::DistillationState state) override;
 
+  void ClearModelForTest() override;
+
  protected:
   void EndBatchUpdates() override;