Add Chromium-only Blender WebEngine parity work

blender-5.2.0/intern/cycles/util/scoped_defer.h

@@ -0,0 +1,39 @@
+/* SPDX-FileCopyrightText: 2026 Blender Foundation
+ *
+ * SPDX-License-Identifier: Apache-2.0 */
+
+#pragma once
+
+#include <utility>
+
+CCL_NAMESPACE_BEGIN
+
+/* Execute a callable when the scope exits. */
+template<typename F> class ScopedDefer {
+ public:
+  explicit ScopedDefer(F &&func) : func_(std::forward<F>(func)) {}
+
+  ~ScopedDefer()
+  {
+    func_();
+  }
+
+  ScopedDefer(const ScopedDefer &) = delete;
+  ScopedDefer &operator=(const ScopedDefer &) = delete;
+
+ private:
+  F func_;
+};
+
+/* Helper to deduce template argument. */
+template<typename F> ScopedDefer<F> make_scoped_defer(F &&func)
+{
+  return ScopedDefer<F>(std::forward<F>(func));
+}
+
+#define SCOPED_DEFER_NAME2(a, b) a##b
+#define SCOPED_DEFER_NAME(a, b) SCOPED_DEFER_NAME2(a, b)
+#define SCOPED_DEFER(code) \
+  auto SCOPED_DEFER_NAME(_scoped_defer_, __LINE__) = make_scoped_defer([&]() { code; })
+
+CCL_NAMESPACE_END