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

components/sessions/serialized_navigation_entry.h

 // Copyright 2013 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 COMPONENTS_SESSIONS_SERIALIZED_NAVIGATION_ENTRY_H_
 #define COMPONENTS_SESSIONS_SERIALIZED_NAVIGATION_ENTRY_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 104 matching lines @@
   void set_blocked_state(BlockedState blocked_state) {
     blocked_state_ = blocked_state;
   }
   std::set<std::string> content_pack_categories() {
     return content_pack_categories_;
   }
   void set_content_pack_categories(
       const std::set<std::string>& content_pack_categories) {
     content_pack_categories_ = content_pack_categories;
   }
+  const std::vector<GURL>& redirect_chain() const { return redirect_chain_; }
 
   // Converts a set of SerializedNavigationEntrys into a list of
   // NavigationEntrys with sequential page IDs and the given context. The caller
   // owns the returned NavigationEntrys.
   static std::vector<content::NavigationEntry*> ToNavigationEntries(
       const std::vector<SerializedNavigationEntry>& navigations,
       content::BrowserContext* browser_context);
 
  private:
   friend class SerializedNavigationEntryTestHelper;
@@ skipping 14 matching lines @@
   content::PageTransition transition_type_;
   bool has_post_data_;
   int64 post_id_;
   GURL original_request_url_;
   bool is_overriding_user_agent_;
   base::Time timestamp_;
   base::string16 search_terms_;
   GURL favicon_url_;
   int http_status_code_;
   bool is_restored_;    // Not persisted.
+  std::vector<GURL> redirect_chain_;  // Not persisted.
 
   // Additional information.
   BlockedState blocked_state_;
   std::set<std::string> content_pack_categories_;
 };
 
 }  // namespace sessions
 
 #endif  // COMPONENTS_SESSIONS_SERIALIZED_NAVIGATION_ENTRY_H_