Add the navigation redirect-chain to Sync sessions proto for offline analysis.

content/public/browser/navigation_entry.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_PUBLIC_BROWSER_NAVIGATION_ENTRY_H_
 #define CONTENT_PUBLIC_BROWSER_NAVIGATION_ENTRY_H_
 
 #include <string>
 
 #include "base/memory/ref_counted_memory.h"
@@ skipping 191 matching lines @@
 
   // The status code of the last known successful navigation.  If
   // GetHttpStatusCode() returns 0 that means that either:
   //
   //   - this navigation hasn't completed yet;
   //   - a response wasn't received;
   //   - or this navigation was restored and for some reason the
   //     status code wasn't available.
   virtual void SetHttpStatusCode(int http_status_code) = 0;
   virtual int GetHttpStatusCode() const = 0;
+
+  // The redirect chain traversed during this navigation, from the initial
+  // redirecting URL to the final non-redirecting current URL.
+  virtual void SetRedirectChain(const std::vector<GURL>& redirects) = 0;
+  virtual const std::vector<GURL>& GetRedirectChain() const = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_NAVIGATION_ENTRY_H_