[Offline Pages] Add a timer to BackgroundLoaderOffliner to delay SavePage by 2 seconds.

chrome/browser/android/offline_pages/background_loader_offliner.h

Index: chrome/browser/android/offline_pages/background_loader_offliner.h
diff --git a/chrome/browser/android/offline_pages/background_loader_offliner.h b/chrome/browser/android/offline_pages/background_loader_offliner.h
index f9c9002c9112a082a4c785002dafe4f6b4e0aad1..961f9c27e39166398cdac02de38627f06ffbe0dd 100644
--- a/chrome/browser/android/offline_pages/background_loader_offliner.h
+++ b/chrome/browser/android/offline_pages/background_loader_offliner.h
@@ -56,6 +56,9 @@ class BackgroundLoaderOffliner : public Offliner,
   enum SaveState { NONE, SAVING, DELETE_AFTER_SAVE };
   enum PageLoadState { SUCCESS, RETRIABLE, NONRETRIABLE };
 
+  // Called when the page is ready to be saved.
+  void SavePage();
+
   // Called when the page has been saved.
   void OnPageSaved(SavePageResult save_result, int64_t offline_id);