Separate sync and invalidation client IDs

sync/tools/null_invalidation_state_tracker.cc

Index: sync/tools/null_invalidation_state_tracker.cc
diff --git a/sync/tools/null_invalidation_state_tracker.cc b/sync/tools/null_invalidation_state_tracker.cc
index 5eb5f788cb2fd290183f272b942468e2ac3da9bd..e5ee257d2f8fdd06128031424968aaeedd11995e 100644
--- a/sync/tools/null_invalidation_state_tracker.cc
+++ b/sync/tools/null_invalidation_state_tracker.cc
@@ -47,6 +47,10 @@ void NullInvalidationStateTracker::SetBootstrapData(const std::string& data) {
   LOG(INFO) << "Setting bootstrap data to: " << base64_data;
 }
 
+void NullInvalidationStateTracker::Clear() {
+  // We have no members to clear.
+}
+
 void NullInvalidationStateTracker::GenerateAckHandles(
     const ObjectIdSet& ids,
     const scoped_refptr<base::TaskRunner>& task_runner,