Implement Invalidator::Acknowledge

sync/notifier/fake_invalidator.cc

 // 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.
 
 #include "sync/notifier/fake_invalidator.h"
 
 namespace syncer {
 
 FakeInvalidator::FakeInvalidator() {}
 
@@ skipping 32 matching lines @@
 void FakeInvalidator::EmitOnIncomingInvalidation(
     const ObjectIdInvalidationMap& invalidation_map) {
   registrar_.DispatchInvalidationsToHandlers(invalidation_map);
 }
 
 void FakeInvalidator::RegisterHandler(InvalidationHandler* handler) {
   registrar_.RegisterHandler(handler);
 }
 
 void FakeInvalidator::UpdateRegisteredIds(InvalidationHandler* handler,
-                                           const ObjectIdSet& ids) {
+                                          const ObjectIdSet& ids) {
   registrar_.UpdateRegisteredIds(handler, ids);
 }
 
 void FakeInvalidator::UnregisterHandler(InvalidationHandler* handler) {
   registrar_.UnregisterHandler(handler);
 }
 
+void FakeInvalidator::Acknowledge(const invalidation::ObjectId& id,
+                                  const AckHandle& ack_handle) {
+  // Do nothing.
+}
+
 InvalidatorState FakeInvalidator::GetInvalidatorState() const {
   return registrar_.GetInvalidatorState();
 }
 
 void FakeInvalidator::SetUniqueId(const std::string& unique_id) {
   unique_id_ = unique_id;
 }
 
 void FakeInvalidator::UpdateCredentials(
     const std::string& email, const std::string& token) {
   email_ = email;
   token_ = token;
 }
 
 void FakeInvalidator::SendInvalidation(
     const ObjectIdInvalidationMap& invalidation_map) {
   last_sent_invalidation_map_ = invalidation_map;
 }
 
 }  // namespace syncer