Introduce ParallelDownloadJob.

content/browser/download/download_request_core.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/browser/download/download_request_core.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
@@ skipping 333 matching lines @@
     }
 
     // Grab the first content-disposition header.  There may be more than one,
     // though as of this writing, the network stack ensures if there are, they
     // are all duplicates.
     headers->EnumerateHeader(nullptr, "Content-Disposition",
                              &create_info->content_disposition);
 
     if (!headers->GetMimeType(&create_info->original_mime_type))
       create_info->original_mime_type.clear();
+
+    create_info->accept_range =
+        headers->HasHeaderValue("Accept-Ranges", "bytes");
   }
 
   // Blink verifies that the requester of this download is allowed to set a
   // suggested name for the security origin of the download URL. However, this
   // assumption doesn't hold if there were cross origin redirects. Therefore,
   // clear the suggested_name for such requests.
   if (create_info->url_chain.size() > 1 &&
       create_info->url_chain.front().GetOrigin() !=
           create_info->url_chain.back().GetOrigin())
     create_info->save_info->suggested_name.clear();
@@ skipping 293 matching lines @@
     return DOWNLOAD_INTERRUPT_REASON_NONE;
   }
 
   if (http_headers.response_code() == net::HTTP_PARTIAL_CONTENT)
     return DOWNLOAD_INTERRUPT_REASON_SERVER_BAD_CONTENT;
 
   return DOWNLOAD_INTERRUPT_REASON_NONE;
 }
 
 }  // namespace content