Add version field to syncer::Invalidation.

sync/notifier/sync_invalidation_listener.h

 // Copyright 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.
 //
 // A simple wrapper around invalidation::InvalidationClient that
 // handles all the startup/shutdown details and hookups.
 
 #ifndef SYNC_NOTIFIER_SYNC_INVALIDATION_LISTENER_H_
 #define SYNC_NOTIFIER_SYNC_INVALIDATION_LISTENER_H_
 
@@ skipping 133 matching lines @@
   AckTracker* GetAckTrackerForTest();
 
  private:
   void Stop();
 
   InvalidatorState GetState() const;
 
   void EmitStateChange();
 
   void PrepareInvalidation(const ObjectIdSet& ids,
+                           int64 version,
                            const std::string& payload,
                            invalidation::InvalidationClient* client,
                            const invalidation::AckHandle& ack_handle);
   void EmitInvalidation(const ObjectIdSet& ids,
+                        int64 version,
                         const std::string& payload,
                         invalidation::InvalidationClient* client,
                         const invalidation::AckHandle& ack_handle,
                         const AckHandleMap& local_ack_handles);
 
   // AckTracker::Delegate implementation.
   virtual void OnTimeout(const ObjectIdSet& ids) OVERRIDE;
 
   base::WeakPtrFactory<SyncInvalidationListener> weak_ptr_factory_;
   AckTracker ack_tracker_;
@@ skipping 12 matching lines @@
   // The states of the ticl and the push client.
   InvalidatorState ticl_state_;
   InvalidatorState push_client_state_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncInvalidationListener);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_NOTIFIER_SYNC_INVALIDATION_LISTENER_H_