IVGCVSW-1642 : adding IBackendInternal interface

Change-Id: Icd55fed8381af319f11b4cd977cf03103cdf1bd9
diff --git a/src/backends/IBackendInternal.hpp b/src/backends/IBackendInternal.hpp
new file mode 100644
index 0000000..1ccf88e
--- /dev/null
+++ b/src/backends/IBackendInternal.hpp
@@ -0,0 +1,23 @@
+//
+// Copyright © 2017 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+#pragma once
+
+#include <armnn/Types.hpp>
+#include <backends/WorkloadFactory.hpp>
+
+namespace armnn
+{
+
+class IBackendInternal : public IBackend
+{
+protected:
+    IBackendInternal() {}
+    virtual ~IBackendInternal() {}
+
+public:
+    virtual std::unique_ptr<IWorkloadFactory> CreateWorkloadFactory() const = 0;
+};
+
+} // namespace armnn