Implement features needed for local ack handling in InvalidationStateTracker.

sync/tools/sync_client.cc

Index: sync/tools/sync_client.cc
diff --git a/sync/tools/sync_client.cc b/sync/tools/sync_client.cc
index c2dc657e1d7ae4939bef35e68785102c18194955..0b02e18e4696d4f79d05410ada18f050f2c9cb8d 100644
--- a/sync/tools/sync_client.cc
+++ b/sync/tools/sync_client.cc
@@ -76,11 +76,13 @@ class NullInvalidationStateTracker
     return InvalidationStateMap();
   }
 
-  virtual void SetMaxVersion(
+  virtual void SetMaxVersionAndPayload(
       const invalidation::ObjectId& id,
-      int64 max_invalidation_version) OVERRIDE {
+      int64 max_invalidation_version,
+      const std::string& payload) OVERRIDE {
     VLOG(1) << "Setting max invalidation version for "
-            << ObjectIdToString(id) << " to " << max_invalidation_version;
+            << ObjectIdToString(id) << " to " << max_invalidation_version
+            << " with payload " << payload;
   }
 
   virtual void Forget(const ObjectIdSet& ids) OVERRIDE {
@@ -98,6 +100,22 @@ class NullInvalidationStateTracker
     CHECK(base::Base64Encode(data, &base64_data));
     VLOG(1) << "Setting bootstrap data to: " << base64_data;
   }
+
+  virtual void GenerateAckHandles(
+      const ObjectIdSet& ids,
+      const scoped_refptr<base::TaskRunner>& task_runner,
+      base::Callback<void(const AckHandleMap&)> callback) OVERRIDE {
+    AckHandleMap ack_handles;
+    for (ObjectIdSet::const_iterator it = ids.begin(); it != ids.end(); ++it) {
+      ack_handles.insert(std::make_pair(*it, AckHandle::InvalidAckHandle()));
+    }
+    task_runner->PostTask(FROM_HERE, base::Bind(callback, ack_handles));
+  }
+
+  virtual void Acknowledge(const invalidation::ObjectId& id,
+                           const AckHandle& ack_handle) OVERRIDE {
+    VLOG(1) << "Received ack for " << ObjectIdToString(id);
+  }
 };
 
 // Needed to use a real host resolver.