Add initial base implementation for WebGPU rendering backend

Source/Engine/GraphicsDevice/WebGPU/IncludeWebGPU.h

@@ -0,0 +1,26 @@
+// Copyright (c) Wojciech Figat. All rights reserved.
+
+#pragma once
+
+#if GRAPHICS_API_WEBGPU
+
+// Fix Intellisense errors when Emsicpten SDK is not visible
+#ifndef UINT32_C
+#define UINT32_C(x) (x ## U)
+#endif
+#ifndef __SIZE_MAX__
+#define __SIZE_MAX__ (static_cast<intptr>(-1))
+#endif
+#ifndef SIZE_MAX
+#define SIZE_MAX __SIZE_MAX__
+#endif
+
+#include <webgpu/webgpu.h>
+
+// Utiltiy macro to convert WGPUStringView into UTF-16 string (on stack)
+#define WEBGPU_TO_STR(strView) StringAsUTF16<>(strView.data, strView.data ? strView.length : 0).Get()
+
+// Utiltiy macro to get WGPUStringView for a text constant
+#define WEBGPU_STR(str) { str, ARRAY_COUNT(str) - 1 }
+
+#endif