3 files changed, 19 insertions, 2 deletions
diff --git a/api/system-current.txt b/api/system-current.txt
index f3f745015769..43b97abb7a79 100644
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -6600,6 +6600,10 @@ package android.util {
 
 package android.view {
 
+  public abstract class Window {
+    method public void addPrivateFlags(int);
+  }
+
   public abstract interface WindowManager implements android.view.ViewManager {
     method public abstract android.graphics.Region getCurrentImeTouchRegion();
   }
@@ -6607,6 +6611,7 @@ package android.view {
   public static class WindowManager.LayoutParams extends android.view.ViewGroup.LayoutParams implements android.os.Parcelable {
     method public final long getUserActivityTimeout();
     method public final void setUserActivityTimeout(long);
+    field public static final int PRIVATE_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS = 524288; // 0x80000
   }
 
 }
diff --git a/core/java/android/view/Window.java b/core/java/android/view/Window.java
index a7ec6df00017..982737aedc74 100644
--- a/core/java/android/view/Window.java
+++ b/core/java/android/view/Window.java
@@ -25,6 +25,7 @@ import android.annotation.LayoutRes;
 import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.annotation.StyleRes;
+import android.annotation.SystemApi;
 import android.annotation.UnsupportedAppUsage;
 import android.app.WindowConfiguration;
 import android.content.Context;
@@ -1079,8 +1080,18 @@ public abstract class Window {
         setFlags(flags, flags);
     }
 
-    /** @hide */
-    @UnsupportedAppUsage
+    /**
+     * Add private flag bits.
+     *
+     * <p>Refer to the individual flags for the permissions needed.
+     *
+     * <p>Note: Only for updateable system components (aka. mainline modules)
+     *
+     * @param flags The flag bits to add.
+     *
+     * @hide
+     */
+    @SystemApi
     public void addPrivateFlags(int flags) {
         setPrivateFlags(flags, flags);
     }
diff --git a/core/java/android/view/WindowManager.java b/core/java/android/view/WindowManager.java
index 0404df027a4c..742df5e8a962 100644
--- a/core/java/android/view/WindowManager.java
+++ b/core/java/android/view/WindowManager.java
@@ -1668,6 +1668,7 @@ public interface WindowManager extends ViewManager {
          * this window is visible.
          * @hide
          */
+        @SystemApi
         @RequiresPermission(permission.HIDE_NON_SYSTEM_OVERLAY_WINDOWS)
         public static final int PRIVATE_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS = 0x00080000;