[Downloads] Use the initiating StoragePartition for resumption.

content/browser/download/download_create_info.h

 // 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.
 
 #ifndef CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_CREATE_INFO_H_
 #define CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_CREATE_INFO_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 28 matching lines @@
 
   // The ID of the download.
   uint32_t download_id;
 
   // The chain of redirects that leading up to and including the final URL.
   std::vector<GURL> url_chain;
 
   // The URL that referred us.
   GURL referrer_url;
 
+  // Site URL for the site instance that initiated the download.
+  GURL site_instance_url;

[Charlie Reis, 2016/05/05 21:43:22]

site_url

(See explanation in download_item.h.)

+
   // The URL of the tab that started us.
   GURL tab_url;
 
   // The referrer URL of the tab that started us.
   GURL tab_referrer_url;
 
   // The time when the download started.
   base::Time start_time;
 
   // The total download size.
@@ skipping 47 matching lines @@
   // For continuing a download, the ETag of the file.
   std::string etag;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DownloadCreateInfo);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_CREATE_INFO_H_