Extract pad destination texture dispatch helper

src/legacy_canvas_stroke_execution_services.h

@@ -116,6 +116,18 @@ struct LegacyCanvasStrokeTextureInputDispatch {
     };
 }
 
+[[nodiscard]] inline LegacyCanvasStrokeTextureInputDispatch make_legacy_canvas_stroke_pad_destination_texture_dispatch(
+    std::function<void(int)> activate_texture_unit,
+    std::function<void()> bind_stroke_destination,
+    std::function<void()> unbind_stroke_destination)
+{
+    return LegacyCanvasStrokeTextureInputDispatch {
+        .activate_texture_unit = std::move(activate_texture_unit),
+        .bind_stroke_destination = std::move(bind_stroke_destination),
+        .unbind_stroke_destination = std::move(unbind_stroke_destination),
+    };
+}
+
 struct LegacyCanvasStrokeSamplerDispatch {
     std::function<void(int)> bind_brush_tip_sampler;
     std::function<void()> unbind_brush_tip_sampler;