feat: establish formal raster particle source chain

src/mbgl/renderer/layers/render_particle_validation_layer.hpp

@@ -1,38 +1,11 @@
 #pragma once
 
-#include <mbgl/renderer/render_layer.hpp>
-#include <mbgl/style/layers/particle_validation_layer_impl.hpp>
+#include <mbgl/renderer/layers/render_raster_particle_layer.hpp>
 
 namespace mbgl {
 
-class ParticleGpuValidationResources;
-
-// VALIDATION ONLY: proves Core RenderLayer/GPU ping-pong integration.
-// STATIC redraws only the frozen Trail composite; it never advances State/Trail slots.
-class RenderParticleValidationLayer final : public RenderLayer {
-public:
-    explicit RenderParticleValidationLayer(Immutable<style::ParticleValidationLayer::Impl>);
-    ~RenderParticleValidationLayer() override;
-
-    void update(gfx::ShaderRegistry&,
-                gfx::Context&,
-                const TransformState&,
-                const std::shared_ptr<UpdateParameters>&,
-                const RenderTree&,
-                UniqueChangeRequestVec&) override;
-
-private:
-    void transition(const TransitionParameters&) override {}
-    void evaluate(const PropertyEvaluationParameters&) override;
-    bool hasTransition() const override { return false; }
-    bool hasCrossfade() const override { return false; }
-    bool needsRepaint() const override;
-    void prepare(const LayerPrepareParameters&) override {}
-    void markLayerRenderable(bool, UniqueChangeRequestVec&) override;
-    void layerRemoved(UniqueChangeRequestVec&) override;
-    void markContextDestroyed() override;
-
-    std::shared_ptr<ParticleGpuValidationResources> gpuValidation;
-};
+// Validation styles reuse the formal GPU renderer and do not own another
+// particle simulation.
+using RenderParticleValidationLayer = RenderRasterParticleLayer;
 
 } // namespace mbgl