Merge "SurfaceFlinger: tune MAX_FREQUENT_LAYER_PERIOD_NS for inactive layers"...

    // is within a threshold. If a layer is infrequent, its average refresh rate is disregarded in

    // favor of a low refresh rate.

    static constexpr size_t FREQUENT_LAYER_WINDOW_SIZE = 3;

    static constexpr float MIN_FPS_FOR_FREQUENT_LAYER = 10.0f;

    static constexpr auto MAX_FREQUENT_LAYER_PERIOD_NS =

            std::chrono::nanoseconds(static_cast<nsecs_t>(1e9f / MIN_FPS_FOR_FREQUENT_LAYER)) + 1ms;

    static constexpr std::chrono::nanoseconds MAX_FREQUENT_LAYER_PERIOD_NS = 150ms;

    friend class LayerHistoryTestV2;