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

components/offline_pages/core/background/offliner_stub.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/background/offliner_stub.h"
 
 #include "base/bind.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "components/offline_pages/core/background/save_page_request.h"
 
 namespace offline_pages {
 
 OfflinerStub::OfflinerStub()
     : disable_loading_(false),
       enable_callback_(false),
       cancel_called_(false),
       snapshot_on_last_retry_(false) {}
 
 OfflinerStub::~OfflinerStub() {}
 
 bool OfflinerStub::LoadAndSave(const SavePageRequest& request,
-                               const CompletionCallback& callback) {
+                               const CompletionCallback& completion_callback,
+                               const ProgressCallback& progress_callback) {
   if (disable_loading_)
     return false;
 
-  callback_ = callback;
+  completion_callback_ = completion_callback;
+  progress_callback_ = progress_callback;
 
   // Post the callback on the run loop.
   if (enable_callback_) {
+    const int64_t arbitrary_size = 153LL;
     base::ThreadTaskRunnerHandle::Get()->PostTask(
-        FROM_HERE,
-        base::Bind(callback, request, Offliner::RequestStatus::SAVED));
+        FROM_HERE, base::Bind(progress_callback_, request, arbitrary_size));
+    base::ThreadTaskRunnerHandle::Get()->PostTask(
+        FROM_HERE, base::Bind(completion_callback_, request,
+                              Offliner::RequestStatus::SAVED));
   }
   return true;
 }
 
 void OfflinerStub::Cancel(const CancelCallback& callback) {
   cancel_called_ = true;
   callback.Run(0LL);
 }
 
 bool OfflinerStub::HandleTimeout(const SavePageRequest& request) {
   if (snapshot_on_last_retry_) {
     base::ThreadTaskRunnerHandle::Get()->PostTask(
-        FROM_HERE,
-        base::Bind(callback_, request, Offliner::RequestStatus::SAVED));
+        FROM_HERE, base::Bind(completion_callback_, request,
+                              Offliner::RequestStatus::SAVED));
     return true;
   }
   return false;
 }
 
 }  // namespace offline_pages