Implement features needed for local ack handling in InvalidationStateTracker.

chrome/browser/sync/invalidations/invalidator_storage.h

Index: chrome/browser/sync/invalidations/invalidator_storage.h
diff --git a/chrome/browser/sync/invalidations/invalidator_storage.h b/chrome/browser/sync/invalidations/invalidator_storage.h
index c0f480fb4111d6893275875d32c262afaddcda9a..7478aba4fcd636092462f5e0f31498dcebb9e010 100644
--- a/chrome/browser/sync/invalidations/invalidator_storage.h
+++ b/chrome/browser/sync/invalidations/invalidator_storage.h
@@ -43,12 +43,19 @@ class InvalidatorStorage : public base::SupportsWeakPtr<InvalidatorStorage>,
   // InvalidationStateTracker implementation.
   virtual syncer::InvalidationStateMap GetAllInvalidationStates() const
       OVERRIDE;
-  virtual void SetMaxVersion(const invalidation::ObjectId& id,
-                             int64 max_version) OVERRIDE;
+  virtual void SetMaxVersionAndPayload(const invalidation::ObjectId& id,
+                                       int64 max_version,
+                                       const std::string& payload) OVERRIDE;
   virtual void Forget(const syncer::ObjectIdSet& ids) OVERRIDE;
   // TODO(tim): These are not yet used. Bug 124140.
   virtual void SetBootstrapData(const std::string& data) OVERRIDE;
   virtual std::string GetBootstrapData() const OVERRIDE;
+  virtual void GenerateAckHandles(
+      const syncer::ObjectIdSet& ids,
+      const scoped_refptr<base::TaskRunner>& task_runner,
+      base::Callback<void(const syncer::AckHandleMap&)> callback) OVERRIDE;
+  virtual void Acknowledge(const invalidation::ObjectId& id,
+                           const syncer::AckHandle& ack_handle) OVERRIDE;
 
  private:
   FRIEND_TEST_ALL_PREFIXES(InvalidatorStorageTest, SerializeEmptyMap);