Fetch the translate script regularly

chrome/browser/translate/translate_manager.h

 // Copyright (c) 2010 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 CHROME_BROWSER_TRANSLATE_TRANSLATE_MANAGER_H_
 #define CHROME_BROWSER_TRANSLATE_TRANSLATE_MANAGER_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 33 matching lines @@
   // Reverts the contents of the page in |tab_contents| to its original
   // language.
   void RevertTranslation(TabContents* tab_contents);
 
   // Reports to the Google translate server that a page language was incorrectly
   // detected.  This call is initiated by the user selecting the "report" menu
   // under options in the translate infobar.
   void ReportLanguageDetectionError(TabContents* tab_contents);
 
   // Clears the translate script, so it will be fetched next time we translate.
-  // Currently used by unit-tests.
   void ClearTranslateScript() { translate_script_.clear(); }
 
   // NotificationObserver implementation:
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
   // URLFetcher::Delegate implementation:
   virtual void OnURLFetchComplete(const URLFetcher* source,
                                   const GURL& url,
                                   const URLRequestStatus& status,
                                   int response_code,
                                   const ResponseCookies& cookies,
                                   const std::string& data);
 
+  // Used by unit-tests to override the default delay after which the translate
+  // script is fetched again from the translation server.
+  void set_translate_script_expiration_delay(int delay_ms) {
+    translate_script_expiration_delay_ = delay_ms;
+  }
+
   // Convenience method to know if a tab is showing a translate infobar.
   static bool IsShowingTranslateInfobar(TabContents* tab);
 
   // Returns true if the URL can be translated, if it is not an internal URL
   // (chrome:// and others).
   static bool IsTranslatableURL(const GURL& url);
 
   // Fills |languages| with the list of languages that the translate server can
   // translate to and from.
   static void GetSupportedLanguages(std::vector<std::string>* languages);
@@ skipping 71 matching lines @@
   // A map that associates a profile with its parsed "accept languages".
   typedef std::set<std::string> LanguageSet;
   typedef std::map<PrefService*, LanguageSet> PrefServiceLanguagesMap;
   PrefServiceLanguagesMap accept_languages_;
 
   ScopedRunnableMethodFactory<TranslateManager> method_factory_;
 
   // The JS injected in the page to do the translation.
   std::string translate_script_;
 
+  // Delay in milli-seconds after which the translate script is fetched again
+  // from the translate server.
+  int translate_script_expiration_delay_;
+
   // Whether the translate JS is currently being retrieved.
   bool translate_script_request_pending_;
 
   // The list of pending translate requests.  Translate requests are queued when
   // the translate script is not ready and has to be fetched from the translate
   // server.
   std::vector<PendingRequest> pending_requests_;
 
   // The languages supported by the translation server.
   static base::LazyInstance<std::set<std::string> > supported_languages_;
 
   DISALLOW_COPY_AND_ASSIGN(TranslateManager);
 };
 
 #endif  // CHROME_BROWSER_TRANSLATE_TRANSLATE_MANAGER_H_