IVGCVSW-2315 Add DebugLayer and no-op factory method

Change-Id: I5455b720565248ff94278e76887d63f8434a7b58
diff --git a/src/backends/reference/RefWorkloadFactory.hpp b/src/backends/reference/RefWorkloadFactory.hpp
index 035e084..9ee1fe5 100644
--- a/src/backends/reference/RefWorkloadFactory.hpp
+++ b/src/backends/reference/RefWorkloadFactory.hpp
@@ -155,6 +155,9 @@
 
     virtual std::unique_ptr<IWorkload> CreateMinimum(const MinimumQueueDescriptor& descriptor,
                                                      const WorkloadInfo& info) const override;
+
+    virtual std::unique_ptr<IWorkload> CreateDebug(const DebugQueueDescriptor& descriptor,
+                                                   const WorkloadInfo& info) const override;
 private:
 
     template <typename F32Workload, typename U8Workload, typename QueueDescriptorType>