Add URP RenderGraph API compatibility surface

managed/XCEngine.ScriptCore/Rendering/Graph/RenderGraph.cs

@@ -0,0 +1,34 @@
+using System;
+
+namespace XCEngine.Rendering.RenderGraphModule
+{
+    public sealed class RenderGraph
+    {
+        private readonly XCEngine.Rendering.ScriptableRenderContext
+            m_context;
+
+        public RenderGraph()
+            : this(null)
+        {
+        }
+
+        public RenderGraph(
+            XCEngine.Rendering.ScriptableRenderContext context)
+        {
+            m_context = context;
+        }
+
+        public XCEngine.Rendering.RenderGraphRasterPassBuilder
+        AddRasterPass(
+            string passName)
+        {
+            if (m_context == null)
+            {
+                throw new InvalidOperationException(
+                    "RenderGraph is not bound to a recording context.");
+            }
+
+            return m_context.AddRasterPass(passName);
+        }
+    }
+}