Update the received slices vector when stream is written to disk

content/browser/download/parallel_download_utils.h

 // 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.
 
 #ifndef CONTENT_BROWSER_DOWNLOAD_PARALLEL_DOWNLOAD_UTILS_H_
 #define CONTENT_BROWSER_DOWNLOAD_PARALLEL_DOWNLOAD_UTILS_H_
 
 #include <vector>
 
 #include "content/common/content_export.h"
 #include "content/public/browser/download_item.h"
 
 namespace content {
 
 // Find the first gap in an array of received slices and return it as the next
 // slice to download. If not found, return a slice that is to the end of all
 // slices. |received_slices| must be ordered by offsets.
 CONTENT_EXPORT DownloadItem::ReceivedSlice FindNextSliceToDownload(
     const std::vector<DownloadItem::ReceivedSlice>& received_slices);
 
+// Adds a new received slice to a vector of sorted slices, and keep it sorted.
+// Returns the index of the newly inserted slice.
+CONTENT_EXPORT int AddReceivedSliceToSortedArray(
+    const DownloadItem::ReceivedSlice& new_slice,
+    std::vector<DownloadItem::ReceivedSlice>& received_slices);
+
 }  //  namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_PARALLEL_DOWNLOAD_UTILS_H_