Implement Invalidator::Acknowledge

sync/notifier/fake_invalidator.h

 // Copyright (c) 2012 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 SYNC_NOTIFIER_FAKE_INVALIDATOR_H_
 #define SYNC_NOTIFIER_FAKE_INVALIDATOR_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 16 matching lines @@
   const ObjectIdInvalidationMap& GetLastSentInvalidationMap() const;
 
   void EmitOnInvalidatorStateChange(InvalidatorState state);
   void EmitOnIncomingInvalidation(
       const ObjectIdInvalidationMap& invalidation_map);
 
   virtual void RegisterHandler(InvalidationHandler* handler) OVERRIDE;
   virtual void UpdateRegisteredIds(InvalidationHandler* handler,
                                    const ObjectIdSet& ids) OVERRIDE;
   virtual void UnregisterHandler(InvalidationHandler* handler) OVERRIDE;
+  virtual void Acknowledge(const invalidation::ObjectId& id,
+                           const AckHandle& ack_handle) OVERRIDE;
   virtual InvalidatorState GetInvalidatorState() const OVERRIDE;
   virtual void SetUniqueId(const std::string& unique_id) OVERRIDE;
   virtual void UpdateCredentials(
       const std::string& email, const std::string& token) OVERRIDE;
   virtual void SendInvalidation(
       const ObjectIdInvalidationMap& invalidation_map) OVERRIDE;
 
  private:
   InvalidatorRegistrar registrar_;
   std::string unique_id_;
   std::string state_;
   std::string email_;
   std::string token_;
   ObjectIdInvalidationMap last_sent_invalidation_map_;
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_NOTIFIER_FAKE_INVALIDATOR_H_