Add Chromium-only Blender WebEngine parity work

blender-5.2.0/source/blender/windowmanager/wm_surface.hh

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+/* SPDX-FileCopyrightText: 2023 Blender Authors
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later */
+
+/** \file
+ * \ingroup wm
+ *
+ * \name WM-Surface
+ *
+ * Container to manage painting in an off-screen context.
+ */
+
+#pragma once
+
+#include "GHOST_Types.hh"
+
+struct GPUContext;
+class GHOST_IContext;
+
+namespace blender {
+
+struct bContext;
+struct wmSurface {
+  wmSurface *next, *prev;
+
+  GHOST_IContext *system_gpu_context;
+  GPUContext *blender_gpu_context;
+
+  void *customdata;
+
+  void (*draw)(bContext *);
+  /** To evaluate the surface's depsgraph. Called as part of the main loop. */
+  void (*do_depsgraph)(bContext *C);
+  /** Free customdata, not the surface itself (done by wm_surface API). */
+  void (*free_data)(wmSurface *);
+
+  /** Called when surface is activated for drawing (made drawable). */
+  void (*activate)();
+  /** Called when surface is deactivated for drawing (current drawable cleared). */
+  void (*deactivate)();
+};
+
+/* Create/Free. */
+
+void wm_surface_add(wmSurface *surface);
+void wm_surface_remove(wmSurface *surface);
+void wm_surfaces_free();
+
+/* Utils. */
+
+void wm_surfaces_iter(bContext *C, void (*cb)(bContext *, wmSurface *));
+
+/* Evaluation. */
+
+void wm_surfaces_do_depsgraph(bContext *C);
+
+/* Drawing. */
+
+void wm_surface_make_drawable(wmSurface *surface);
+void wm_surface_clear_drawable();
+void wm_surface_set_drawable(wmSurface *surface, bool activate);
+void wm_surface_reset_drawable();
+
+}  // namespace blender