Glue parallel download job and download file together.

content/browser/download/mock_download_item_impl.cc

 // Copyright 2017 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/browser/download/mock_download_item_impl.h"
 
 namespace content {
 
-MockDownloadItemImpl::MockDownloadItemImpl(DownloadItemImplDelegate* delegate)
+MockDownloadItemImpl::MockDownloadItemImpl(
+    DownloadItemImplDelegate* delegate,
+    const DownloadItem::ReceivedSlices& received_slices)
     : DownloadItemImpl(delegate,
                        std::string("7d122682-55b5-4a47-a253-36cadc3e5bee"),
                        content::DownloadItem::kInvalidId,
                        base::FilePath(),
                        base::FilePath(),
                        std::vector<GURL>(),
                        GURL(),
                        GURL(),
                        GURL(),
                        GURL(),
                        "application/octet-stream",
                        "application/octet-stream",
                        base::Time(),
                        base::Time(),
                        std::string(),
                        std::string(),
                        0,
                        0,
                        std::string(),
                        DownloadItem::COMPLETE,
                        DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
                        DOWNLOAD_INTERRUPT_REASON_NONE,
                        false,
                        base::Time(),
-                       std::vector<DownloadItem::ReceivedSlice>(),
+                       received_slices,
                        net::NetLogWithSource()) {}
 
+MockDownloadItemImpl::MockDownloadItemImpl(DownloadItemImplDelegate* delegate)
+    : MockDownloadItemImpl(delegate, DownloadItem::ReceivedSlices()) {}
+
 MockDownloadItemImpl::~MockDownloadItemImpl() = default;
 
 }  // namespace content