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/Reference.cpp b/tests/validation/Reference.cpp
index be3f28b..cab9d51 100644
--- a/tests/validation/Reference.cpp
+++ b/tests/validation/Reference.cpp
@@ -266,7 +266,7 @@
     return ref_dst;
 }
 
-RawTensor Reference::compute_reference_box3x3(const TensorShape &shape)
+RawTensor Reference::compute_reference_box3x3(const TensorShape &shape, BorderMode border_mode, uint8_t constant_border_value)
 {
     // Create reference
     RawTensor ref_src = library->get(shape, DataType::U8);
@@ -276,7 +276,7 @@
     library->fill_tensor_uniform(ref_src, 0);
 
     // Compute reference
-    ReferenceCPP::box3x3(ref_src, ref_dst);
+    ReferenceCPP::box3x3(ref_src, ref_dst, border_mode, constant_border_value);
 
     return ref_dst;
 }