Implement Invalidator::Acknowledge

sync/notifier/non_blocking_invalidator.h

Index: sync/notifier/non_blocking_invalidator.h
diff --git a/sync/notifier/non_blocking_invalidator.h b/sync/notifier/non_blocking_invalidator.h
index 35e870b9240e313bd1de36a64009a7159301946d..6e4c65174eb7e9cc13d538931ec822175fae5da3 100644
--- a/sync/notifier/non_blocking_invalidator.h
+++ b/sync/notifier/non_blocking_invalidator.h
@@ -37,7 +37,7 @@ class NonBlockingInvalidator
   // |invalidation_state_tracker| must be initialized.
   NonBlockingInvalidator(
       const notifier::NotifierOptions& notifier_options,
-      const InvalidationVersionMap& initial_max_invalidation_versions,
+      const InvalidationStateMap& initial_invalidation_state_map,
       const std::string& initial_invalidation_state,
       const WeakHandle<InvalidationStateTracker>&
           invalidation_state_tracker,
@@ -50,6 +50,8 @@ class NonBlockingInvalidator
   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 SetStateDeprecated(const std::string& state) OVERRIDE;