Fix the Download Notifications for Offline Pages to indicate bytes loaded.

chrome/browser/android/offline_pages/background_loader_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_BACKGROUND_LOADER_OFFLINER_H_
 #define CHROME_BROWSER_ANDROID_OFFLINE_PAGES_BACKGROUND_LOADER_OFFLINER_H_
 
 #include <memory>
 
 #include "base/android/application_status_listener.h"
@@ skipping 18 matching lines @@
 class BackgroundLoaderOffliner : public Offliner,
                                  public content::WebContentsObserver {
  public:
   BackgroundLoaderOffliner(content::BrowserContext* browser_context,
                            const OfflinerPolicy* policy,
                            OfflinePageModel* offline_page_model);
   ~BackgroundLoaderOffliner() override;
 
   // Offliner implementation.
   bool LoadAndSave(const SavePageRequest& request,
-                   const CompletionCallback& callback) override;
+                   const CompletionCallback& completion_callback,
+                   const ProgressCallback& progress_callback) override;
   void Cancel() override;
   bool HandleTimeout(const SavePageRequest& request) override;
 
   // WebContentsObserver implementation.
   void DidStopLoading() override;
   void RenderProcessGone(base::TerminationStatus status) override;
   void WebContentsDestroyed() override;
   void DidFinishNavigation(
       content::NavigationHandle* navigation_handle) override;
 
@@ skipping 38 matching lines @@
   PageLoadState page_load_state_;
   // Seconds to delay before taking snapshot.
   long page_delay_ms_;
 
   base::WeakPtrFactory<BackgroundLoaderOffliner> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(BackgroundLoaderOffliner);
 };
 
 }  // namespace offline_pages
 #endif  // CHROME_BROWSER_ANDROID_OFFLINE_PAGES_BACKGROUND_LOADER_OFFLINER_H_