Implement features needed for local ack handling in InvalidationStateTracker.

sync/notifier/fake_invalidation_state_tracker.h

Index: sync/notifier/fake_invalidation_state_tracker.h
diff --git a/sync/notifier/fake_invalidation_state_tracker.h b/sync/notifier/fake_invalidation_state_tracker.h
index bd9003b6edc5a4779fb311a62e9ea1c1cbcbd004..a3ea0bf70c826200f15fcd0110d36acaaf05aa25 100644
--- a/sync/notifier/fake_invalidation_state_tracker.h
+++ b/sync/notifier/fake_invalidation_state_tracker.h
@@ -23,11 +23,18 @@ class FakeInvalidationStateTracker
 
   // InvalidationStateTracker implementation.
   virtual 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 ObjectIdSet& ids) OVERRIDE;
   virtual void SetBootstrapData(const std::string& data) OVERRIDE;
   virtual std::string GetBootstrapData() const OVERRIDE;
+  virtual void GenerateAckHandles(
+      const ObjectIdSet& ids,
+      const scoped_refptr<base::TaskRunner>& task_runner,
+      base::Callback<void(const AckHandleMap&)> callback) OVERRIDE;
+  virtual void Acknowledge(const invalidation::ObjectId& id,
+                           const AckHandle& ack_handle) OVERRIDE;
 
   static const int64 kMinVersion;