Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/audaspace/include/fx/Echo.h

@@ -0,0 +1,27 @@
+#pragma once
+
+/**
+ * @file Echo.h
+ * @ingroup fx
+ * The Echo class.
+ */
+
+#include "fx/Effect.h"
+
+AUD_NAMESPACE_BEGIN
+
+class AUD_API Echo : public Effect
+{
+private:
+	float m_delay;      /* Delay time in seconds */
+	float m_feedback;   /* Feedback amount */
+	float m_mix;        /* Wet/dry mix */
+	bool m_resetBuffer; /* Whether to reset the delay buffer */
+
+public:
+	Echo(std::shared_ptr<ISound> sound, float delay, float feedback, float mix, bool resetBuffer = true);
+
+	virtual std::shared_ptr<IReader> createReader();
+};
+
+AUD_NAMESPACE_END