Add Chromium-only Blender WebEngine parity work

blender-5.2.0/intern/cycles/session/cache_eviction.h

@@ -0,0 +1,45 @@
+/* SPDX-FileCopyrightText: 2026 Blender Foundation
+ *
+ * SPDX-License-Identifier: Apache-2.0 */
+
+#pragma once
+
+#include <chrono>
+
+#include "util/types.h"
+
+CCL_NAMESPACE_BEGIN
+
+/* CacheEvictionManager has decides when texture cache eviction should
+ * happen in a render session. Different policies are used for viewport
+ * and final rendering. */
+class CacheEvictionManager {
+ public:
+  explicit CacheEvictionManager(bool background);
+
+  /* Reset state when starting a new render. */
+  void reset();
+
+  /* Set and query if viewport navigation is happening. */
+  void set_navigating(bool navigating);
+  bool is_navigating() const;
+
+  /* For a render iteration, check if cache eviction is needed. */
+  bool need_eviction(bool idle, bool switched_to_new_tile);
+
+  /* Wait time until cache eviction needs to be performed. */
+  std::chrono::milliseconds wait_time(bool idle) const;
+
+ private:
+  const bool background_;
+
+  bool navigating_ = false;
+
+  double viewport_last_activity_ = 0.0;
+  bool viewport_was_navigating_ = false;
+  int render_tile_count_ = 0;
+
+  static constexpr double VIEWPORT_EVICTION_DELAY = 2.0;
+};
+
+CCL_NAMESPACE_END