COMPMID-589: Port HOGDescriptor to new validation

Change-Id: I2021612e61de1b82aaeb49249d06929c7fceb15f
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/115216
Reviewed-by: Pablo Tello <pablo.tello@arm.com>
Tested-by: Jenkins <bsgcomp@arm.com>
diff --git a/arm_compute/core/HOGInfo.h b/arm_compute/core/HOGInfo.h
index 6546293..f555742 100644
--- a/arm_compute/core/HOGInfo.h
+++ b/arm_compute/core/HOGInfo.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016, 2017 ARM Limited.
+ * Copyright (c) 2016, 2018 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -123,6 +123,12 @@
      * @return The Size2D data object which stores the number of cells along the x and y directions
      */
     Size2D num_cells_per_block() const;
+
+    /** Calculates the number of cells per block stride
+     *
+     * @return The Size2D data object which stores the number of cells per block stride along the x and y directions
+     */
+    Size2D num_cells_per_block_stride() const;
     /** Calculates the number of blocks for the given image size
      *
      * @param[in] image_size The input image size data object