COMPMID-2856 Add PrintLayer at graph level

Signed-off-by: Giorgio Arena <giorgio.arena@arm.com>
Change-Id: I8f02bb67adae8cc7d884f2417cc9c408985f0d5a
Reviewed-on: https://review.mlplatform.org/c/2546
Reviewed-by: Manuel Bottini <manuel.bottini@arm.com>
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
diff --git a/arm_compute/graph/INodeVisitor.h b/arm_compute/graph/INodeVisitor.h
index 59eddda..25018d4 100644
--- a/arm_compute/graph/INodeVisitor.h
+++ b/arm_compute/graph/INodeVisitor.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2019 ARM Limited.
+ * Copyright (c) 2018-2020 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -136,6 +136,11 @@
      * @param[in] n Node to visit.
      */
     virtual void visit(PoolingLayerNode &n) = 0;
+    /** Visit PrintLayerNode.
+     *
+     * @param[in] n Node to visit.
+     */
+    virtual void visit(PrintLayerNode &n) = 0;
     /** Visit PriorBoxLayerNode.
      *
      * @param[in] n Node to visit.
@@ -261,6 +266,10 @@
     {
         default_visit();
     }
+    virtual void visit(PrintLayerNode &) override
+    {
+        default_visit();
+    }
     virtual void visit(PriorBoxLayerNode &) override
     {
         default_visit();