MLCE-51 MaxPool + Add Unit test

Change-Id: Id1619ce72a862841439b68e51113febfb0e38fcc
diff --git a/src/backends/test/LayerTests.hpp b/src/backends/test/LayerTests.hpp
index 9f8cd3f..6687439 100644
--- a/src/backends/test/LayerTests.hpp
+++ b/src/backends/test/LayerTests.hpp
@@ -376,3 +376,4 @@
 LayerTestResult<float, 4> MeanFloatMultipleDimsTest(armnn::IWorkloadFactory& workloadFactory);
 LayerTestResult<float, 1> MeanVtsFloat1Test(armnn::IWorkloadFactory& workloadFactory);
 LayerTestResult<float, 3> MeanVtsFloat2Test(armnn::IWorkloadFactory& workloadFactory);
+LayerTestResult<float, 4> AdditionAfterMaxPoolTest(armnn::IWorkloadFactory& workloadFactory);
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