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/accessibility/FontWeightAdjustmentPreferenceController.java

@@ -20,6 +20,7 @@ import android.content.Context;
 import android.graphics.fonts.FontStyle;
 import android.provider.Settings;
 
+import com.android.settings.R;
 import com.android.settings.core.TogglePreferenceController;
 
 /** PreferenceController for displaying all text in bold. */
@@ -47,4 +48,9 @@ public class FontWeightAdjustmentPreferenceController extends TogglePreferenceCo
         return Settings.Secure.putInt(mContext.getContentResolver(),
                 Settings.Secure.FONT_WEIGHT_ADJUSTMENT, (isChecked ? BOLD_TEXT_ADJUSTMENT : 0));
     }
+
+    @Override
+    public int getSliceHighlightMenuRes() {
+        return R.string.menu_key_accessibility;
+    }
 }