Add highlight menu keys for all toggle pref controllers and custom slices

Bug: 204695404
Test: manual, robotest build pass, unit
Change-Id: Iad2e28ada8ddb766ffa7eff2c8dc581250cbd6f8

src/com/android/settings/homepage/contextualcards/slices/BluetoothDevicesSlice.java

@@ -130,11 +130,17 @@ public class BluetoothDevicesSlice implements CustomSliceable {
         return SliceBuilderUtils.buildSearchResultPageIntent(mContext,
                 ConnectedDeviceDashboardFragment.class.getName(), "" /* key */,
                 screenTitle,
-                SettingsEnums.SLICE)
+                SettingsEnums.SLICE,
+                this)
                 .setClassName(mContext.getPackageName(), SubSettings.class.getName())
                 .setData(getUri());
     }
 
+    @Override
+    public int getSliceHighlightMenuRes() {
+        return R.string.menu_key_connected_devices;
+    }
+
     @Override
     public void onNotifyChange(Intent intent) {
         final boolean enableBluetooth = intent.getBooleanExtra(EXTRA_ENABLE_BLUETOOTH, false);