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

components/offline_pages/core/downloads/download_notifying_observer.cc

 // 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.
 
 #include "components/offline_pages/core/downloads/download_notifying_observer.h"
 
 #include "components/offline_pages/core/background/request_coordinator.h"
 #include "components/offline_pages/core/background/save_page_request.h"
 #include "components/offline_pages/core/client_policy_controller.h"
 #include "components/offline_pages/core/downloads/download_ui_adapter.h"
@@ skipping 46 matching lines @@
     NotifyRequestStateChange(request);
 }
 
 void DownloadNotifyingObserver::OnChanged(const SavePageRequest& request) {
   DCHECK(notifier_.get());
   if (!IsVisibleInUI(request.client_id()))
     return;
   NotifyRequestStateChange(request);
 }
 
+void DownloadNotifyingObserver::OnNetworkProgress(
+    const SavePageRequest& request,
+    int64_t received_bytes) {
+  DownloadUIItem item(request);
+  item.download_progress_bytes = received_bytes;
+  notifier_->NotifyDownloadProgress(item);
+}
+
 void DownloadNotifyingObserver::OnCompleted(
     const SavePageRequest& request,
     RequestCoordinator::BackgroundSavePageResult status) {
   DCHECK(notifier_.get());
   if (!IsVisibleInUI(request.client_id()))
     return;
   if (status == RequestCoordinator::BackgroundSavePageResult::SUCCESS)
     notifier_->NotifyDownloadSuccessful(DownloadUIItem(request));
   else if (status == RequestCoordinator::BackgroundSavePageResult::REMOVED)
     notifier_->NotifyDownloadCanceled(DownloadUIItem(request));
@@ skipping 14 matching lines @@
     const SavePageRequest& request) {
   if (request.request_state() == SavePageRequest::RequestState::PAUSED)
     notifier_->NotifyDownloadPaused(DownloadUIItem(request));
   else if (request.request_state() == SavePageRequest::RequestState::AVAILABLE)
     notifier_->NotifyDownloadInterrupted(DownloadUIItem(request));
   else
     notifier_->NotifyDownloadProgress(DownloadUIItem(request));
 }
 
 }  // namespace offline_pages