[Offline pages]: Implement background loader to save on last retry, and record last retry success U…

chrome/browser/android/offline_pages/prerendering_offliner.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_ANDROID_OFFLINE_PAGES_PRERENDERING_OFFLINER_H_
 #define CHROME_BROWSER_ANDROID_OFFLINE_PAGES_PRERENDERING_OFFLINER_H_
 
 #include <memory>
 
 #include "base/android/application_status_listener.h"
@@ skipping 81 matching lines @@
   // Lazily created.
   std::unique_ptr<PrerenderingLoader> loader_;
   // Tracks pending request, if any. Owned copy.
   // May be used to ensure a callback applies to the pending request (e.g., in
   // case we receive a save page callback for an old, canceled request).
   std::unique_ptr<SavePageRequest> pending_request_;
   // Callback to call when pending request completes/fails.
   CompletionCallback completion_callback_;
   ProgressCallback progress_callback_;
   bool is_low_end_device_;
+  bool saved_on_last_retry_;
   // ApplicationStatusListener to monitor if the Chrome moves to the foreground.
   std::unique_ptr<base::android::ApplicationStatusListener> app_listener_;
   base::WeakPtrFactory<PrerenderingOffliner> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PrerenderingOffliner);
 };
 
 }  // namespace offline_pages
 
 #endif  // CHROME_BROWSER_ANDROID_OFFLINE_PAGES_PRERENDERING_OFFLINER_H_