Fixes to enable indication of bytes downloaded for Offline Pages in Download Home.

components/offline_pages/core/downloads/download_ui_adapter.h

Index: components/offline_pages/core/downloads/download_ui_adapter.h
diff --git a/components/offline_pages/core/downloads/download_ui_adapter.h b/components/offline_pages/core/downloads/download_ui_adapter.h
index f0ecbd6a967d0845a09aaa70ef35e778eb21d875..8bfb0a37c56181046a4bfd8ed6b18cd10dc8a10c 100644
--- a/components/offline_pages/core/downloads/download_ui_adapter.h
+++ b/components/offline_pages/core/downloads/download_ui_adapter.h
@@ -78,6 +78,10 @@ class DownloadUIAdapter : public OfflinePageModel::Observer,
                     std::unique_ptr<Delegate> delegate);
   ~DownloadUIAdapter() override;
 
+  static DownloadUIAdapter* FromOfflinePageModel(OfflinePageModel* model);
+  static void AttachToOfflinePageModel(DownloadUIAdapter* adapter,
+                                       OfflinePageModel* model);
+
   // This adapter is potentially shared by UI elements, each of which adds
   // itself as an observer.
   // When the last observer is removed, cached list of items is destroyed and