Add Chromium-only Blender WebEngine parity work

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

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+/* SPDX-FileCopyrightText: 2004 Blender Authors
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later */
+
+#pragma once
+
+/** \file
+ * \ingroup sequencer
+ */
+
+#include "BLI_span.hh"
+
+namespace blender {
+
+struct Editing;
+struct Scene;
+struct Strip;
+struct StripProxy;
+
+namespace seq {
+
+/**
+ * Cache must be freed before calling this function
+ * since it leaves the #Editing::seqbase in an invalid state.
+ */
+void seq_free_strip_recurse(Scene *scene, Strip *strip, bool do_id_user);
+StripProxy *seq_strip_proxy_alloc();
+/**
+ * Find effect strips, that use strip `strip` as one of inputs.
+ * If lookup hash doesn't exist, it will be created. If hash is tagged as invalid, it will be
+ * rebuilt.
+ *
+ * \param key: pointer to Strip inside of meta strip
+ *
+ * \return collection of effect strips
+ */
+Span<Strip *> SEQ_lookup_effects_by_strip(Editing *ed, const Strip *key);
+
+}  // namespace seq
+}  // namespace blender