Implement new invalidations ack tracking system

sync/notifier/object_id_invalidation_map.h

 // Copyright 2013 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_OBJECT_ID_INVALIDATION_MAP_H_
 #define SYNC_NOTIFIER_OBJECT_ID_INVALIDATION_MAP_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 31 matching lines @@
    // whose IDs were in the specified |ids| set.
    ObjectIdInvalidationMap GetSubsetWithObjectIds(const ObjectIdSet& ids) const;
 
    // Returns the subset of invalidations with IDs matching |id|.
    const SingleObjectInvalidationSet& ForObject(
        invalidation::ObjectId id) const;
 
    // Returns the contents of this map in a single vector.
    void GetAllInvalidations(std::vector<syncer::Invalidation>* out) const;
 
+   // Call Acknowledge() on all contained Invalidations.
+   void AcknowledgeAll() const;
+
    // Serialize this map to a value.
    scoped_ptr<base::ListValue> ToValue() const;
 
    // Deserialize the value into a map and use it to re-initialize this object.
    bool ResetFromValue(const base::ListValue& value);
 
    // Prints the contentes of this map as a human-readable string.
    std::string ToString() const;
 
   private:
    typedef std::map<invalidation::ObjectId,
                     SingleObjectInvalidationSet,
                     ObjectIdLessThan> IdToListMap;
 
    ObjectIdInvalidationMap(const IdToListMap& map);
 
    IdToListMap map_;
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_NOTIFIER_OBJECT_ID_INVALIDATION_MAP_H_