Add Settings Slice Whitelist key

Bug: 79779103
Test: None - only a flag.
Change-Id: I794159db4ff8aba7b6dcd91e13a984db40da47e7
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index f4721c2..77836a0 100644
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -11570,6 +11570,13 @@
         /** @hide */ public static final int EMULATE_DISPLAY_CUTOUT_ON = 1;
 
         /**
+         * A colon separated list of keys for Settings Slices.
+         *
+         * @hide
+         */
+        public static final String BLOCKED_SLICES = "blocked_slices";
+
+        /**
          * Defines global zen mode.  ZEN_MODE_OFF, ZEN_MODE_IMPORTANT_INTERRUPTIONS,
          * or ZEN_MODE_NO_INTERRUPTIONS.
          *
diff --git a/core/tests/coretests/src/android/provider/SettingsBackupTest.java b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
index c6ada7a..65e7b1d 100644
--- a/core/tests/coretests/src/android/provider/SettingsBackupTest.java
+++ b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
@@ -132,6 +132,7 @@
                     Settings.Global.BLE_SCAN_LOW_LATENCY_WINDOW_MS,
                     Settings.Global.BLE_SCAN_LOW_LATENCY_INTERVAL_MS,
                     Settings.Global.BLE_SCAN_BACKGROUND_MODE,
+                    Settings.Global.BLOCKED_SLICES,
                     Settings.Global.BLOCKING_HELPER_DISMISS_TO_VIEW_RATIO_LIMIT,
                     Settings.Global.BLOCKING_HELPER_STREAK_LIMIT,
                     Settings.Global.BLUETOOTH_A2DP_SINK_PRIORITY_PREFIX,