Add two sided support for shadow pass

com.unity.shadergraph/Editor/Data/LightweightPipeline/LightWeightPBRSubShader.cs

 
             var extraPassesTemplateLocation = ShaderGenerator.GetTemplatePath("lightweightPBRExtraPasses.template");
             if (File.Exists(extraPassesTemplateLocation))
-                subShader.AddShaderChunk(File.ReadAllText(extraPassesTemplateLocation), true);
+            {
+                var extraPassesTemplate = File.ReadAllText(extraPassesTemplateLocation);
+                extraPassesTemplate = extraPassesTemplate.Replace("${Culling}", materialOptions.cullMode.ToString());
+                subShader.AddShaderChunk(extraPassesTemplate, true);
+            }            
 
             subShader.Deindent();
             subShader.AddShaderChunk("}", true);

com.unity.shadergraph/Editor/Data/LightweightPipeline/LightWeightUnlitSubShader.cs

 
             var extraPassesTemplateLocation = ShaderGenerator.GetTemplatePath("lightweightUnlitExtraPasses.template");
             if (File.Exists(extraPassesTemplateLocation))
-                subShader.AddShaderChunk(File.ReadAllText(extraPassesTemplateLocation), true);
-
+            {
+                var extraPassesTemplate = File.ReadAllText(extraPassesTemplateLocation);
+                extraPassesTemplate = extraPassesTemplate.Replace("${Culling}", materialOptions.cullMode.ToString());
+                subShader.AddShaderChunk(extraPassesTemplate, true);
+            }
 
             subShader.Deindent();
             subShader.AddShaderChunk("}", true);

com.unity.shadergraph/Editor/Templates/lightweightPBRExtraPasses.template

 
     ZWrite On
     ZTest LEqual
+    Cull ${Culling}
 
     HLSLPROGRAM
     // Required to compile gles 2.0 with standard srp library

com.unity.shadergraph/Editor/Templates/lightweightUnlitExtraPasses.template

 
     ZWrite On
     ZTest LEqual
+    Cull ${Culling}
 
     HLSLPROGRAM
     // Required to compile gles 2.0 with standard srp library