[Offline Pages] Make prerenderer notify us of network progress.

components/offline_pages/core/downloads/download_ui_adapter_unittest.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_ui_adapter.h"
 
 #include <stdint.h>
 
 #include <map>
 #include <memory>
@@ skipping 437 matching lines @@
   adapter->RemoveObserver(this);
   items_loaded = false;
 
   PumpLoop();
 
   adapter->AddObserver(this);
   PumpLoop();
   EXPECT_TRUE(items_loaded);
 }
 
+TEST_F(DownloadUIAdapterTest, UpdateProgress) {
+  offliner_stub->enable_callback(true);
+  AddRequest(GURL(kTestUrl), kTestClientId1);
+  PumpLoop();
+
+  int64_t offline_id = adapter->GetOfflineIdByGuid(kTestGuid1);
+  const DownloadUIItem* item = adapter->GetItem(kTestGuid1);
+
+  ASSERT_NE(nullptr, item);
+  EXPECT_EQ(item->download_progress_bytes, 0);
+  updated_guids.clear();
+
+  adapter->UpdateProgress(offline_id, 15);
+  EXPECT_EQ(kTestGuid1, updated_guids[0]);
+  EXPECT_EQ(item->download_progress_bytes, 15);
+}
+
 }  // namespace offline_pages