[Invalidations] Add GetInvalidatorState() to Invalidator{,Frontend}

sync/notifier/fake_invalidator.h

Index: sync/notifier/fake_invalidator.h
diff --git a/sync/notifier/fake_invalidator.h b/sync/notifier/fake_invalidator.h
index 07690ddf685fd64e0b97d57c5648e59b6070655c..dff7d2108ee30d14e74da881b0e6b6bef28ad1ec 100644
--- a/sync/notifier/fake_invalidator.h
+++ b/sync/notifier/fake_invalidator.h
@@ -27,20 +27,20 @@ class FakeInvalidator : public Invalidator {
   const std::string& GetCredentialsToken() const;
   const ObjectIdStateMap& GetLastSentIdStateMap() const;
 
-  void EmitOnNotificationsEnabled();
-  void EmitOnIncomingNotification(const ObjectIdStateMap& id_state_map,
-                                  IncomingNotificationSource source);
-  void EmitOnNotificationsDisabled(NotificationsDisabledReason reason);
+  void EmitOnInvalidatorStateChange(InvalidatorState state);
+  void EmitOnIncomingInvalidation(const ObjectIdStateMap& id_state_map,
+                                  IncomingInvalidationSource source);
 
   virtual void RegisterHandler(InvalidationHandler* handler) OVERRIDE;
   virtual void UpdateRegisteredIds(InvalidationHandler* handler,
                                    const ObjectIdSet& ids) OVERRIDE;
   virtual void UnregisterHandler(InvalidationHandler* handler) OVERRIDE;
+  virtual InvalidatorState GetInvalidatorState() const OVERRIDE;
   virtual void SetUniqueId(const std::string& unique_id) OVERRIDE;
   virtual void SetStateDeprecated(const std::string& state) OVERRIDE;
   virtual void UpdateCredentials(
       const std::string& email, const std::string& token) OVERRIDE;
-  virtual void SendNotification(const ObjectIdStateMap& id_state_map) OVERRIDE;
+  virtual void SendInvalidation(const ObjectIdStateMap& id_state_map) OVERRIDE;
 
  private:
   InvalidatorRegistrar registrar_;