folder structure refine

Runtime/ui/painting/shadow_utils.cs

 
 namespace Unity.UIWidgets.ui {
     static class ShadowUtils {
-        public const bool kUseFastShadow = false;
+        public const bool kUseFastShadow = true;
 
         const float kAmbientHeightFactor = 1.0f / 128.0f;
         const float kAmbientGeomFactor = 64.0f;

Runtime/ui/utils/renderer/common/geometry.meta

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Runtime/ui/utils/renderer/compositeCanvas/compositing.cs.meta

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