[Downloads] Update origin info after each response.

content/browser/download/download_stats.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.
 //
 // Holds helpers for gathering UMA stats about downloads.
 
 #ifndef CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_STATS_H_
 #define CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_STATS_H_
 
 #include <string>
@@ skipping 200 matching lines @@
   SAVE_PACKAGE_WRITE_TO_COMPLETED,
 
   // The save package tried to write to an already failed file.
   SAVE_PACKAGE_WRITE_TO_FAILED,
 
   SAVE_PACKAGE_LAST_ENTRY
 };
 
 void RecordSavePackageEvent(SavePackageEvent event);
 
+enum OriginStateOnResumption {
+  ORIGIN_STATE_ON_RESUMPTION_ADDITIONAL_REDIRECTS = 1<<0,
+  ORIGIN_STATE_ON_RESUMPTION_VALIDATORS_CHANGED = 1<<1,
+  ORIGIN_STATE_ON_RESUMPTION_CONTENT_DISPOSITION_CHANGED = 1<<2,
+  ORIGIN_STATE_ON_RESUMPTION_MAX = 1<<3
+};
+
+// Record the state of the origin information across a download resumption
+// request. |state| is a combination of values from OriginStateOnResumption
+// enum.
+void RecordOriginStateOnResumption(bool is_partial,
+                                   int state);
+
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_STATS_H_