Make DownloadFileImpl handle multiple byte streams.

content/public/test/test_file_error_injector.cc

 // Copyright (c) 2012 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 "content/public/test/test_file_error_injector.h"
 
 #include <utility>
 #include <vector>
 
 #include "base/callback.h"
@@ skipping 93 matching lines @@
     std::unique_ptr<ByteStreamReader> byte_stream,
     const net::NetLogWithSource& net_log,
     base::WeakPtr<DownloadDestinationObserver> observer,
     const TestFileErrorInjector::FileErrorInfo& error_info,
     const base::Closure& ctor_callback,
     const base::Closure& dtor_callback)
     : DownloadFileImpl(std::move(save_info),
                        default_download_directory,
                        std::move(byte_stream),
                        net_log,
+                       false,

[alexmos, 2017/03/02 21:45:14]

nit: consider adding /* is_sparse_file */ for readability, or switching to an
enum

[xingliu, 2017/03/02 23:06:15]

Done.

                        observer),
       error_info_(error_info),
       destruction_callback_(dtor_callback) {
   // DownloadFiles are created on the UI thread and are destroyed on the FILE
   // thread. Schedule the ConstructionCallback on the FILE thread so that if a
   // DownloadItem schedules a DownloadFile to be destroyed and creates another
   // one (as happens during download resumption), then the DestructionCallback
   // for the old DownloadFile is run before the ConstructionCallback for the
   // next DownloadFile.
   BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE, ctor_callback);
@@ skipping 279 matching lines @@
     case FILE_OPERATION_RENAME_ANNOTATE:
       return "RENAME_ANNOTATE";
     default:
       break;
   }
 
   return "Unknown";
 }
 
 }  // namespace content