Add new setting key for credential manager

Test: built locally
Bug: 250713478

Change-Id: Icdaf9135f274b0b5dce24b5ec7a25aa09ba8c7ae

core/java/android/provider/Settings.java

@@ -6875,6 +6875,14 @@ public final class Settings {
         @Readable
         public static final String VOICE_INTERACTION_SERVICE = "voice_interaction_service";
 
+
+        /**
+         * The currently selected credential service(s) flattened ComponentName.
+         *
+         * @hide
+         */
+        public static final String CREDENTIAL_SERVICE = "credential_service";
+
         /**
          * The currently selected autofill service flattened ComponentName.
          * @hide

packages/SettingsProvider/test/src/android/provider/SettingsBackupTest.java

@@ -816,7 +816,8 @@ public class SettingsBackupTest {
                  Settings.Secure.REDUCE_BRIGHT_COLORS_ACTIVATED,
                  Settings.Secure.ACCESSIBILITY_SHOW_WINDOW_MAGNIFICATION_PROMPT,
                  Settings.Secure.ACCESSIBILITY_FLOATING_MENU_MIGRATION_TOOLTIP_PROMPT,
-                 Settings.Secure.UI_TRANSLATION_ENABLED);
+                 Settings.Secure.UI_TRANSLATION_ENABLED,
+                 Settings.Secure.CREDENTIAL_SERVICE);
 
     @Test
     public void systemSettingsBackedUpOrDenied() {