IVGCVSW-2557 Ref Workload Implementation for Detection PostProcess

 * implementation of DetectionPostProcessQueueDescriptor validate
 * add Uint8ToFloat32Workload
 * add implementation of Detection PostProcess functionalities
 * add ref workload implemenentation for float and uint8
 * add layer support for Detection PostProcess in ref
 * unit tests

Change-Id: I650461f49edbb3c533d68ef8700377af51bc3592
diff --git a/src/backends/reference/workloads/RefDetectionPostProcessFloat32Workload.hpp b/src/backends/reference/workloads/RefDetectionPostProcessFloat32Workload.hpp
new file mode 100644
index 0000000..9f2a697
--- /dev/null
+++ b/src/backends/reference/workloads/RefDetectionPostProcessFloat32Workload.hpp
@@ -0,0 +1,25 @@
+//
+// Copyright © 2017 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#pragma once
+
+#include <backendsCommon/Workload.hpp>
+#include <backendsCommon/WorkloadData.hpp>
+
+namespace armnn
+{
+
+class RefDetectionPostProcessFloat32Workload : public Float32Workload<DetectionPostProcessQueueDescriptor>
+{
+public:
+    explicit RefDetectionPostProcessFloat32Workload(const DetectionPostProcessQueueDescriptor& descriptor,
+                                                    const WorkloadInfo& info);
+    virtual void Execute() const override;
+
+private:
+    std::unique_ptr<ScopedCpuTensorHandle> m_Anchors;
+};
+
+} //namespace armnn