COMPMID-424 Add CL validation tests for Box3x3

* Add tests for different border modes
* Add padding calculator

Change-Id: Ic4708faddfb1c8e6b59d349cf9cb48c9a181d717
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/78105
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
Reviewed-by: Moritz Pflanzer <moritz.pflanzer@arm.com>
diff --git a/tests/validation/ReferenceCPP.cpp b/tests/validation/ReferenceCPP.cpp
index ca6bb6c..15e6bac 100644
--- a/tests/validation/ReferenceCPP.cpp
+++ b/tests/validation/ReferenceCPP.cpp
@@ -178,13 +178,13 @@
     tensor_operations::bitwise_not(s, d);
 }
 
-// 3-by-3 box filter
-void ReferenceCPP::box3x3(const RawTensor &src, RawTensor &dst)
+// Box3x3 filter
+void ReferenceCPP::box3x3(const RawTensor &src, RawTensor &dst, BorderMode border_mode, uint8_t constant_border_value)
 {
     ARM_COMPUTE_ERROR_ON(src.data_type() != DataType::U8 || dst.data_type() != DataType::U8);
     const Tensor<uint8_t> s(src.shape(), src.data_type(), src.fixed_point_position(), reinterpret_cast<const uint8_t *>(src.data()));
     Tensor<uint8_t>       d(dst.shape(), dst.data_type(), dst.fixed_point_position(), reinterpret_cast<uint8_t *>(dst.data()));
-    tensor_operations::box3x3(s, d);
+    tensor_operations::box3x3(s, d, border_mode, constant_border_value);
 }
 
 // Depth conversion