IVGCVSW-4906 Add front-end support for FILL operator

 * Added new fill layer
 * Added visitor tests

Signed-off-by: Ryan OShea <Ryan.OShea2@arm.com>
Change-Id: Iea677014866b4f2d514004623f59ee83f3c0eef8
Signed-off-by: Keith Davis <keith.davis@arm.com>
diff --git a/src/armnnSerializer/Serializer.hpp b/src/armnnSerializer/Serializer.hpp
index 6dd6558..65d87b7 100644
--- a/src/armnnSerializer/Serializer.hpp
+++ b/src/armnnSerializer/Serializer.hpp
@@ -121,6 +121,10 @@
     void VisitEqualLayer(const armnn::IConnectableLayer* layer,
                          const char* name = nullptr) override;
 
+    void VisitFillLayer(const armnn::IConnectableLayer* layer,
+                        const armnn::FillDescriptor& fillDescriptor,
+                        const char* name = nullptr) override;
+
     void VisitFloorLayer(const armnn::IConnectableLayer *layer,
                          const char *name = nullptr) override;