Pass highest handled invalidation version between invalidators

chrome/browser/chromeos/policy/device_cloud_policy_invalidator.h

 // Copyright 2014 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 CHROME_BROWSER_CHROMEOS_POLICY_DEVICE_CLOUD_POLICY_INVALIDATOR_H_
 #define CHROME_BROWSER_CHROMEOS_POLICY_DEVICE_CLOUD_POLICY_INVALIDATOR_H_
 
+#include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 namespace invalidation {
 class InvalidationService;
 class TiclInvalidationService;
@@ skipping 63 matching lines @@
   scoped_ptr<InvalidationServiceObserver> device_invalidation_service_observer_;
 
   // State observers for logged-in users' invalidation services.
   ScopedVector<InvalidationServiceObserver>
       profile_invalidation_service_observers_;
 
   // The invalidation service backing the current |CloudPolicyInvalidator|. NULL
   // if no |CloudPolicyInvalidator| exists.
   invalidation::InvalidationService* invalidation_service_;
 
+  // The highest invalidation version that was handled already.
+  int64 highest_handled_invalidation_version_;
+
   // The current |CloudPolicyInvalidator|. NULL if no connected invalidation
   // service is available.
   scoped_ptr<CloudPolicyInvalidator> invalidator_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceCloudPolicyInvalidator);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_CHROMEOS_POLICY_DEVICE_CLOUD_POLICY_INVALIDATOR_H_