Enforce system radius instead of separate value for widgets in launcher

The change is behind a flag. This is to get to the stage of having
consistent corner radius across rectangular widgets.

Bug: 373351337
Test: Unit test and manual
Flag: com.android.launcher3.enforce_system_radius_for_app_widgets
Change-Id: I23d8d3bb2561b4fc3f780fc4ddce62e8b9293192

src/com/android/launcher3/widget/RoundedCornerEnforcement.java

@@ -16,6 +16,8 @@
 
 package com.android.launcher3.widget;
 
+import static com.android.launcher3.Flags.enforceSystemRadiusForAppWidgets;
+
 import android.appwidget.AppWidgetHostView;
 import android.content.Context;
 import android.content.res.Resources;
@@ -97,6 +99,10 @@ public class RoundedCornerEnforcement {
     public static float computeEnforcedRadius(@NonNull Context context) {
         Resources res = context.getResources();
         float systemRadius = res.getDimension(android.R.dimen.system_app_widget_background_radius);
+        if (enforceSystemRadiusForAppWidgets()) {
+            return systemRadius;
+        }
+
         float defaultRadius = res.getDimension(R.dimen.enforced_rounded_corner_max_radius);
         return Math.min(defaultRadius, systemRadius);
     }