[GCM] Adding last token fetching time handling

google_apis/gcm/engine/gcm_store.h

Index: google_apis/gcm/engine/gcm_store.h
diff --git a/google_apis/gcm/engine/gcm_store.h b/google_apis/gcm/engine/gcm_store.h
index 9a1d8d87cb7ef6d1eda98531d4d7484dff8f4366..28666886b0f253075f2df783fa9804468bef34dc 100644
--- a/google_apis/gcm/engine/gcm_store.h
+++ b/google_apis/gcm/engine/gcm_store.h
@@ -55,6 +55,7 @@ class GCM_EXPORT GCMStore {
     base::Time last_checkin_time;
     std::set<std::string> last_checkin_accounts;
     AccountMappings account_mappings;
+    base::Time last_token_fetching_time;
   };
 
   typedef std::vector<std::string> PersistentIdList;
@@ -128,6 +129,10 @@ class GCM_EXPORT GCMStore {
   virtual void RemoveAccountMapping(const std::string& account_id,
                                     const UpdateCallback& callback) = 0;
 
+  // Sets the time of last token fetching time.
+  virtual void SetLastTokenFetchingTime(const base::Time& time,
+                                        const UpdateCallback& callback) = 0;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(GCMStore);
 };