Add Chromium-only Blender WebEngine parity work

blender-5.2.0/source/blender/sequencer/SEQ_prefetch.hh

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+/* SPDX-FileCopyrightText: 2004 Blender Authors
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later */
+
+#pragma once
+
+/** \file
+ * \ingroup sequencer
+ */
+
+namespace blender {
+
+struct bContext;
+struct Scene;
+
+namespace seq {
+
+void prefetch_stop_all();
+/**
+ * Use also to update scene and context changes
+ * This function should almost always be called by cache invalidation, not directly.
+ */
+void prefetch_stop(Scene *scene);
+bool prefetch_need_redraw(const bContext *C, Scene *scene);
+
+}  // namespace seq
+}  // namespace blender