[GCM] Adding last token fetching time handling

components/gcm_driver/gcm_driver_desktop.h

Index: components/gcm_driver/gcm_driver_desktop.h
diff --git a/components/gcm_driver/gcm_driver_desktop.h b/components/gcm_driver/gcm_driver_desktop.h
index 7267de0e478290a6237496bfd8d1146d1d9ee292..49ae17c057a8258dea3ef71399b21538bba64519 100644
--- a/components/gcm_driver/gcm_driver_desktop.h
+++ b/components/gcm_driver/gcm_driver_desktop.h
@@ -81,6 +81,8 @@ class GCMDriverDesktop : public GCMDriver {
       const std::vector<GCMClient::AccountTokenInfo>& account_tokens) override;
   void UpdateAccountMapping(const AccountMapping& account_mapping) override;
   void RemoveAccountMapping(const std::string& account_id) override;
+  base::Time GetLastTokenFetchingTime() override;
+  void SetLastTokenFetchingTime(const base::Time& time) override;
 
   // Exposed for testing purpose.
   bool gcm_enabled() const { return gcm_enabled_; }
@@ -123,7 +125,8 @@ class GCMDriverDesktop : public GCMDriver {
   void SendAcknowledged(const std::string& app_id,
                         const std::string& message_id);
   void GCMClientReady(
-      const std::vector<AccountMapping>& account_mappings);
+      const std::vector<AccountMapping>& account_mappings,
+      const base::Time& last_token_fetching_time);
   void OnConnected(const net::IPEndPoint& ip_endpoint);
   void OnDisconnected();
 
@@ -154,6 +157,9 @@ class GCMDriverDesktop : public GCMDriver {
   // Account mapper. Only works when user is signed in.
   scoped_ptr<GCMAccountMapper> account_mapper_;
 
+  // Time of last token fetching.
+  base::Time last_token_fetching_time_;
+
   scoped_refptr<base::SequencedTaskRunner> ui_thread_;
   scoped_refptr<base::SequencedTaskRunner> io_thread_;