Add initial base implementation for WebGPU rendering backend

Source/Engine/GraphicsDevice/WebGPU/GraphicsDeviceWebGPU.Build.cs

@@ -0,0 +1,24 @@
+// Copyright (c) Wojciech Figat. All rights reserved.
+
+using System.IO;
+using Flax.Build.NativeCpp;
+using Flax.Build.Platforms;
+
+/// <summary>
+/// WebGPU graphics backend module.
+/// </summary>
+public class GraphicsDeviceWebGPU : GraphicsDeviceBaseModule
+{
+    /// <inheritdoc />
+    public override void Setup(BuildOptions options)
+    {
+        base.Setup(options);
+
+        var port = "--use-port=emdawnwebgpu:cpp_bindings=false";
+        options.CompileEnv.CustomArgs.Add(port);
+        options.LinkEnv.CustomArgs.Add("-sASYNCIFY");
+        options.OutputFiles.Add(port);
+        options.PublicDefinitions.Add("GRAPHICS_API_WEBGPU");
+        options.PrivateIncludePaths.Add(Path.Combine(EmscriptenSdk.Instance.EmscriptenPath, "emscripten/cache/ports/emdawnwebgpu/emdawnwebgpu_pkg/webgpu/include"));
+    }
+}