diff --git a/services/core/java/com/android/server/wm/DisplayPolicy.java b/services/core/java/com/android/server/wm/DisplayPolicy.java
index 3bb3653..cae7670 100644
--- a/services/core/java/com/android/server/wm/DisplayPolicy.java
+++ b/services/core/java/com/android/server/wm/DisplayPolicy.java
@@ -25,6 +25,7 @@
 import static android.app.WindowConfiguration.WINDOWING_MODE_UNDEFINED;
 import static android.content.res.Configuration.UI_MODE_TYPE_CAR;
 import static android.content.res.Configuration.UI_MODE_TYPE_MASK;
+import static android.view.Display.TYPE_BUILT_IN;
 import static android.view.InsetsState.TYPE_TOP_BAR;
 import static android.view.InsetsState.TYPE_TOP_GESTURES;
 import static android.view.InsetsState.TYPE_TOP_TAPPABLE_ELEMENT;
@@ -112,7 +113,6 @@
 import android.annotation.Nullable;
 import android.annotation.Px;
 import android.app.ActivityManager;
-import android.app.ActivityManagerInternal;
 import android.app.ActivityThread;
 import android.app.LoadedApk;
 import android.app.ResourcesManager;
@@ -157,6 +157,7 @@
 import com.android.internal.R;
 import com.android.internal.annotations.GuardedBy;
 import com.android.internal.annotations.VisibleForTesting;
+import com.android.internal.policy.ScreenDecorationsUtils;
 import com.android.internal.util.ScreenShapeHelper;
 import com.android.internal.util.ScreenshotHelper;
 import com.android.internal.util.function.TriConsumer;
@@ -2870,6 +2871,16 @@
                 - statusBarHeight;
     }
 
+    /**
+     * Return corner radius in pixels that should be used on windows in order to cover the display.
+     * The radius is only valid for built-in displays since the one who configures window corner
+     * radius cannot know the corner radius of non-built-in display.
+     */
+    float getWindowCornerRadius() {
+        return mDisplayContent.getDisplay().getType() == TYPE_BUILT_IN
+                ? ScreenDecorationsUtils.getWindowCornerRadius(mContext.getResources()) : 0f;
+    }
+
     boolean isShowingDreamLw() {
         return mShowingDream;
     }