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

components/sessions/serialized_navigation_entry.h

Index: components/sessions/serialized_navigation_entry.h
diff --git a/components/sessions/serialized_navigation_entry.h b/components/sessions/serialized_navigation_entry.h
index 859d39fa40582496908272ba1d7c7d424b8076e4..350dd5e171b5cf0fabff07135ddac656e5994141 100644
--- a/components/sessions/serialized_navigation_entry.h
+++ b/components/sessions/serialized_navigation_entry.h
@@ -122,6 +122,7 @@ class SESSIONS_EXPORT SerializedNavigationEntry {
       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
@@ -156,6 +157,7 @@ class SESSIONS_EXPORT SerializedNavigationEntry {
   GURL favicon_url_;
   int http_status_code_;
   bool is_restored_;    // Not persisted.
+  std::vector<GURL> redirect_chain_;  // Only filled for local sessions.

[brettw, 2014/03/11 22:40:01]

I don't know what a local session is in this context. Is this the same as "Not
persisted" on the previous line?

[Donn Denman, 2014/03/12 20:13:36]

Yes, it means not persisted.  Done.

 
   // Additional information.
   BlockedState blocked_state_;