Serialize managed SRP asset graphs

managed/XCEngine.ScriptCore/Rendering/Core/ScriptableRenderPipelineAsset.cs

@@ -10,6 +10,21 @@ namespace XCEngine.Rendering
         {
         }
 
+        internal static string SerializeAssetGraphInstance(
+            ScriptableRenderPipelineAsset asset)
+        {
+            return ScriptableObjectSerializedGraph.Serialize(asset);
+        }
+
+        internal static ScriptableRenderPipelineAsset
+            DeserializeAssetGraphInstance(
+                string serializedAssetGraph)
+        {
+            return ScriptableObjectSerializedGraph
+                .Deserialize(serializedAssetGraph) as
+                ScriptableRenderPipelineAsset;
+        }
+
         internal void ReleaseRuntimeResourcesInstance()
         {
             ReleaseRuntimeResources();