Translate: language list smart updater

chrome/browser/translate/translate_language_list.h

Index: chrome/browser/translate/translate_language_list.h
diff --git a/chrome/browser/translate/translate_language_list.h b/chrome/browser/translate/translate_language_list.h
index 4518eaf59b818d6e8af2a8117825827f22c5ac5c..33926620a49255e22ac5ea14941a953244f426e6 100644
--- a/chrome/browser/translate/translate_language_list.h
+++ b/chrome/browser/translate/translate_language_list.h
@@ -12,6 +12,7 @@
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time.h"
+#include "chrome/browser/web_resource/resource_request_allowed_notifier.h"
 #include "googleurl/src/gurl.h"
 #include "net/url_request/url_fetcher_delegate.h"
 
@@ -22,7 +23,7 @@ class URLFetcher;
 // The TranslateLanguageList class is responsible for maintaining the latest
 // supporting language list.
 // This class is defined to be owned only by TranslateManager.
-class TranslateLanguageList {
+class TranslateLanguageList : public ResourceRequestAllowedNotifier::Observer {
  public:
   TranslateLanguageList();
   virtual ~TranslateLanguageList();
@@ -52,6 +53,9 @@ class TranslateLanguageList {
   // already updated.
   void RequestLanguageList();
 
+  // ResourceRequestAllowedNotifier::Observer implementation:
+  virtual void OnResourceRequestsAllowed() OVERRIDE;
+
   // static const values shared with our browser tests.
   static const char kLanguageListCallbackName[];
   static const char kTargetLanguagesKey[];
@@ -104,6 +108,9 @@ class TranslateLanguageList {
     // fetch operation is finished.
     Callback callback_;
 
+    // Counts how many times did it try to fetch the language list.
+    int retry_count_;
+
     DISALLOW_COPY_AND_ASSIGN(LanguageListFetcher);
   };
 
@@ -137,6 +144,9 @@ class TranslateLanguageList {
   // The last-updated time when the language list is sent.
   base::Time last_updated_;
 
+  // Helper class to know if it's allowed to make network resource requests.
+  ResourceRequestAllowedNotifier resource_request_allowed_notifier_;
+
   DISALLOW_COPY_AND_ASSIGN(TranslateLanguageList);
 };