Gate off % border radii on Android Paper

Summary:
This code is forked on iOS, where we have been, as a policy, avoiding Paper-specific changes. This code is shared between renderers on Android, but it is confusing developer experience to have it work on Android Paper, to then fail on iOS unless it is on new arch.

This change disables support on Android Paper for consistency.

Changelog:
[Android][Removed] - Gate off % border radii on Android Paper

Differential Revision: D60967347

packages/react-native/ReactAndroid/api/ReactAndroid.api

@@ -4369,6 +4369,7 @@ public final class com/facebook/react/uimanager/LengthPercentage {
 	public static final field Companion Lcom/facebook/react/uimanager/LengthPercentage$Companion;
 	public fun <init> ()V
 	public fun <init> (FLcom/facebook/react/uimanager/LengthPercentageType;)V
+	public final fun getUnit ()Lcom/facebook/react/uimanager/LengthPercentageType;
 	public final fun resolve (FF)F
 	public static final fun setFromDynamic (Lcom/facebook/react/bridge/Dynamic;)Lcom/facebook/react/uimanager/LengthPercentage;
 }

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/LengthPercentage.kt

@@ -20,7 +20,7 @@ public enum class LengthPercentageType {
 
 public class LengthPercentage(
     private val value: Float,
-    private val unit: LengthPercentageType,
+    public val unit: LengthPercentageType,
 ) {
   public companion object {
     @JvmStatic

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/view/ReactViewManager.java

@@ -26,6 +26,7 @@
 import com.facebook.react.module.annotations.ReactModule;
 import com.facebook.react.uimanager.BackgroundStyleApplicator;
 import com.facebook.react.uimanager.LengthPercentage;
+import com.facebook.react.uimanager.LengthPercentageType;
 import com.facebook.react.uimanager.PixelUtil;
 import com.facebook.react.uimanager.PointerEvents;
 import com.facebook.react.uimanager.Spacing;
@@ -156,6 +157,15 @@ public void nextFocusUp(ReactViewGroup view, int viewId) {
       })
   public void setBorderRadius(ReactViewGroup view, int index, Dynamic rawBorderRadius) {
     @Nullable LengthPercentage borderRadius = LengthPercentage.setFromDynamic(rawBorderRadius);
+
+    // We do not support percentage border radii on Paper in order to be consistent with iOS (to
+    // avoid developer surprise if it works on one platform but not another).
+    if (ViewUtil.getUIManagerType(view) != UIManagerType.FABRIC
+        && borderRadius != null
+        && borderRadius.getUnit() == LengthPercentageType.PERCENT) {
+      borderRadius = null;
+    }
+
     if (ReactNativeFeatureFlags.enableBackgroundStyleApplicator()) {
       BackgroundStyleApplicator.setBorderRadius(
           view, BorderRadiusProp.values()[index], borderRadius);