Built-in Standard Terrain material upgrade path for HDRP

com.unity.render-pipelines.high-definition/Editor/Material/TerrainLit/StandardsTerrainToHDTerrainLitUpgrader.cs

@@ -0,0 +1,21 @@
+using UnityEngine;
+using UnityEngine.Rendering.HighDefinition;
+
+namespace UnityEditor.Rendering.HighDefinition
+{
+    class StandardsTerrainToHDTerrainLitUpgrader : MaterialUpgrader
+    {
+
+        public StandardsTerrainToHDTerrainLitUpgrader(string sourceShaderName, string destShaderName, MaterialFinalizer finalizer = null)
+        {
+            RenameShader(sourceShaderName, destShaderName, finalizer);
+        }
+
+        public override void Convert(Material srcMaterial, Material dstMaterial)
+        {
+            base.Convert(srcMaterial, dstMaterial);
+
+            HDShaderUtils.ResetMaterialKeywords(dstMaterial);
+        }
+    }
+}

com.unity.render-pipelines.high-definition/Editor/Upgraders/UpgradeStandardShaderMaterials.cs

@@ -18,6 +18,9 @@ static List<MaterialUpgrader> GetHDUpgraders()
             upgraders.Add(new UnlitsToHDUnlitUpgrader("Unlit/Texture", "HDRP/Unlit"));
             upgraders.Add(new UnlitsToHDUnlitUpgrader("Unlit/Transparent", "HDRP/Unlit"));
             upgraders.Add(new UnlitsToHDUnlitUpgrader("Unlit/Transparent Cutout", "HDRP/Unlit"));
+
+			upgraders.Add(new StandardsTerrainToHDTerrainLitUpgrader("Nature/Terrain/Standard", "HDRP/TerrainLit"));
+
             return upgraders;
         }