Added SSAO Debug View to Pipeline

ScriptableRenderPipeline/LightweightPipeline/LWRP/Data/LightweightPipelineAsset.cs

         Albedo,
         Normals,
         Metallness,
-        Smoothness
+        Smoothness,
+        Occlusion
     };
 
     public class LightweightPipelineAsset : RenderPipelineAsset

ScriptableRenderPipeline/LightweightPipeline/LWRP/LightweightPipeline.cs

                 case DebugViewMode.Smoothness:
                     LightweightShaderUtils.SetDebugMode(cmd, DebugViewKeyword.SMOOTHNESS);
                     break;
+                case DebugViewMode.Occlusion:
+                    LightweightShaderUtils.SetDebugMode(cmd, DebugViewKeyword.OCCLUSION);
+                    break;
             }
             context.ExecuteCommandBuffer(cmd);
             CommandBufferPool.Release(cmd);

ScriptableRenderPipeline/LightweightPipeline/LWRP/LightweightShaderUtils.cs

         METALNESS,
         NORMALS,
         SMOOTHNESS,
+        OCCLUSION,
 
         NUM_VIEWS
     }
             "_DEBUG_ALBEDO",
             "_DEBUG_METALNESS",
             "_DEBUG_NORMALS",
-            "_DEBUG_SMOOTHNESS"
+            "_DEBUG_SMOOTHNESS",
+            "_DEBUG_OCCLUSION"
         };
 
         public static string GetShaderPath(ShaderPathID id)

ScriptableRenderPipeline/LightweightPipeline/LWRP/ShaderLibrary/LightweightPassLit.hlsl

     debug = sqrt(inputData.normalWS);
 #elif defined(_DEBUG_SMOOTHNESS)
     debug = surfaceData.smoothness;
+#elif defined(_DEBUG_OCCLUSION)
+    ApplySSAO(surfaceData.occlusion, IN.shadowCoord);
+    debug = surfaceData.occlusion;
 #endif
     return half4(debug, 1);
 }

ScriptableRenderPipeline/LightweightPipeline/LWRP/Shaders/LightweightStandard.shader

             // GPU Instancing
             #pragma multi_compile_instancing
 
-            #pragma multi_compile _ _DEBUG_ALBEDO _DEBUG_METALNESS _DEBUG_NORMALS _DEBUG_SMOOTHNESS
+            #pragma multi_compile _ _DEBUG_ALBEDO _DEBUG_METALNESS _DEBUG_NORMALS _DEBUG_SMOOTHNESS _DEBUG_OCCLUSION
-            //#include "LWRP/ShaderLibrary/LightweightPassDebug.hlsl"
             #include "LWRP/ShaderLibrary/LightweightPassLit.hlsl"
             ENDHLSL
         }

ScriptableRenderPipeline/LightweightPipeline/LWRP/Shaders/Subsurface/LightweightSubsurface.shader

             // GPU Instancing
             #pragma multi_compile_instancing
 
-            #pragma multi_compile _ _DEBUG_ALBEDO _DEBUG_METALNESS _DEBUG_NORMALS _DEBUG_SMOOTHNESS
+            #pragma multi_compile _ _DEBUG_ALBEDO _DEBUG_METALNESS _DEBUG_NORMALS _DEBUG_SMOOTHNESS _DEBUG_OCCLUSION
 
             #pragma vertex   LitPassVertex
             #pragma fragment DebugPassFragment