Add SHADERPASS_SHADOWS

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/LayeredLit/LayeredLit.shader

 
             HLSLPROGRAM
 
-            #define SHADERPASS SHADERPASS_DEPTH_ONLY
+            #define SHADERPASS SHADERPASS_SHADOWS
             #define USE_LEGACY_UNITY_MATRIX_VARIABLES
             #include "../../ShaderVariables.hlsl"
             #include "../../Material/Material.hlsl"

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/LayeredLit/LayeredLitTessellation.shader

             #pragma hull Hull
             #pragma domain Domain
 
-            #define SHADERPASS SHADERPASS_DEPTH_ONLY
+            #define SHADERPASS SHADERPASS_SHADOWS
             #define USE_LEGACY_UNITY_MATRIX_VARIABLES
             #include "../../ShaderVariables.hlsl"
             #include "../../Material/Material.hlsl"

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/Lit.shader

 
             HLSLPROGRAM
 
-            #define SHADERPASS SHADERPASS_DEPTH_ONLY
+            #define SHADERPASS SHADERPASS_SHADOWS
             #define USE_LEGACY_UNITY_MATRIX_VARIABLES
             #include "../../ShaderVariables.hlsl"
             #include "../../Material/Material.hlsl"

Assets/ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/LitTessellation.shader

             #pragma hull Hull
             #pragma domain Domain
 
-            #define SHADERPASS SHADERPASS_DEPTH_ONLY
+            #define SHADERPASS SHADERPASS_SHADOWS
             #define USE_LEGACY_UNITY_MATRIX_VARIABLES
             #include "../../ShaderVariables.hlsl"
             #include "../../Material/Material.hlsl"

Assets/ScriptableRenderPipeline/HDRenderPipeline/ShaderPass/ShaderPass.cs

         DepthOnly,
         Velocity,
         Distortion,
-        LightTransport
+        LightTransport,
+        Shadows
     }
 }

Assets/ScriptableRenderPipeline/HDRenderPipeline/ShaderPass/ShaderPass.cs.hlsl

 #define SHADERPASS_VELOCITY (4)
 #define SHADERPASS_DISTORTION (5)
 #define SHADERPASS_LIGHT_TRANSPORT (6)
+#define SHADERPASS_SHADOWS (7)
 
 
 #endif

Assets/ScriptableRenderPipeline/HDRenderPipeline/ShaderPass/ShaderPassDepthOnly.hlsl

-#if SHADERPASS != SHADERPASS_DEPTH_ONLY
+#if (SHADERPASS != SHADERPASS_DEPTH_ONLY && SHADERPASS != SHADERPASS_SHADOWS)
 #error SHADERPASS_is_not_correctly_define
 #endif
 

Assets/ScriptableRenderPipeline/HDRenderPipeline/ShaderVariablesFunctions.hlsl

 
 float3 GetCurrentCameraPosition()
 {
-#if defined(SHADERPASS) && (SHADERPASS != SHADERPASS_DEPTH_ONLY)
+#if defined(SHADERPASS) && (SHADERPASS != SHADERPASS_SHADOWS)
     return _WorldSpaceCameraPos;
 #else
     // TEMP: this is rather expensive. Then again, we need '_WorldSpaceCameraPos'
 // Returns 'true' if the current camera performs a perspective projection.
 bool IsPerspectiveCamera()
 {
-#if defined(SHADERPASS) && (SHADERPASS != SHADERPASS_DEPTH_ONLY)
+#if defined(SHADERPASS) && (SHADERPASS != SHADERPASS_SHADOWS)
     return (unity_OrthoParams.w == 0);
 #else
     // TODO: set 'unity_OrthoParams' during the shadow pass.