[rac] Use stale libaddressinput data if download fails

third_party/libaddressinput/chromium/cpp/src/retriever.h

 // Copyright (C) 2013 Google Inc.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 // http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 62 matching lines @@
   // "https://i18napis.appspot.com/ssl-aggregate-address/data/US". If the |url|
   // does not start with |validation_data_url| that was passed to the
   // constructor, then returns an empty string. (This can happen if the user of
   // the library returns a bad URL in their Downloader implementation.)
   std::string GetKeyForUrl(const std::string& url) const;
 
   // Returns true if the |url| starts with |validation_data_url| that was passed
   // to the constructor.
   bool IsValidationDataUrl(const std::string& url) const;
 
-  // Looks up the callback for |key| in |requests_|, removes it from the map
-  // and returns it. Assumes that |key| is in fact in |requests_|.
-  scoped_ptr<Callback> GetCallbackForKey(const std::string& key);
+  // Looks up the callback for |key| in |requests_|, removes it from the map and
+  // invokes it with |key|, |success|, and |data| parameters.
+  void InvokeCallbackForKey(const std::string& key,
+                            bool success,
+                            const std::string& data);
 
   const std::string validation_data_url_;
   scoped_ptr<Downloader> downloader_;
   scoped_ptr<Storage> storage_;
+
   // Holds pending requests. The callback pointers are owned.
   std::map<std::string, Callback*> requests_;
 
+  // Holds data from storage that has expired timestamps. If a download fails,
+  // then this data is used as fallback.
+  std::map<std::string, std::string> stale_data_;
+
   DISALLOW_COPY_AND_ASSIGN(Retriever);
 };
 
 }  // namespace addressinput
 }  // namespace i18n
 
 #endif  // I18N_ADDRESSINPUT_RETRIEVER_H_