[ShaderGraph][HD][8.x.x] Fix for Scene Depth node and Keywords (#61)

* move the location of keyword generation

* Update CHANGELOG.md

Author: alindmanUnity

com.unity.render-pipelines.high-definition/Editor/ShaderGraph/HDSubShaderUtilities.cs

@@ -841,6 +841,10 @@ public static bool GenerateShaderPass(AbstractMaterialNode masterNode, Pass pass
 
             ShaderGenerator defines = new ShaderGenerator();
             {
+                defines.AddShaderChunk("// Shared Graph Keywords");
+                defines.AddShaderChunk(shaderKeywordDeclarations.ToString());
+                defines.AddShaderChunk(shaderKeywordPermutations.ToString());
+
                 defines.AddShaderChunk(string.Format("#define SHADERPASS {0}", pass.ShaderPassName), true);
                 if (pass.ExtraDefines != null)
                 {
@@ -894,10 +898,6 @@ public static bool GenerateShaderPass(AbstractMaterialNode masterNode, Pass pass
                     shaderPassIncludes.AddShaderChunk(include);
             }
 
-            defines.AddShaderChunk("// Shared Graph Keywords");
-            defines.AddShaderChunk(shaderKeywordDeclarations.ToString());
-            defines.AddShaderChunk(shaderKeywordPermutations.ToString());
-
             // build graph code
             var graph = new ShaderGenerator();
             {

com.unity.shadergraph/CHANGELOG.md

@@ -17,6 +17,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed a bug with the `Transform` node where converting from `Absolute World` space in a sub graph causes invalid subscript errors. [1190813](https://issuetracker.unity3d.com/issues/shadergraph-invalid-subscript-errors-are-thrown-when-connecting-a-subgraph-with-transform-node-with-unlit-master-node)
 - Fixed a bug where the `Position` node would change coordinate spaces from `World` to `Absolute World` when shaders recompile. [1184617](https://issuetracker.unity3d.com/product/unity/issues/guid/1184617/)
 - Optimized loading a large Shader Graph. [1209047](https://issuetracker.unity3d.com/issues/shader-graph-unresponsive-editor-when-using-large-graphs)
+- Fixed a bug where `Scene Depth` nodes would stop working after adding a keyword on the blackboard. [1203333](https://issuetracker.unity3d.com/product/unity/issues/guid/1203333/)
 
 ## [8.0.1] - 2020-05-25