Add notification channel groups.

Test: runtest systemui-notification, cts
Change-Id: I3ed82f2b20d3f791b7cae379a49373cb41231739
diff --git a/core/java/android/app/INotificationManager.aidl b/core/java/android/app/INotificationManager.aidl
index 740af9c..58cd310 100644
--- a/core/java/android/app/INotificationManager.aidl
+++ b/core/java/android/app/INotificationManager.aidl
@@ -54,7 +54,9 @@
     boolean areNotificationsEnabled(String pkg);
     int getPackageImportance(String pkg);
 
+    void createNotificationChannelGroups(String pkg, in ParceledListSlice channelGroupList);
     void createNotificationChannels(String pkg, in ParceledListSlice channelsList);
+    ParceledListSlice getNotificationChannelGroupsForPackage(String pkg, int uid, boolean includeDeleted);
     void updateNotificationChannelForPackage(String pkg, int uid, in NotificationChannel channel);
     NotificationChannel getNotificationChannel(String pkg, String channelId);
     NotificationChannel getNotificationChannelForPackage(String pkg, int uid, String channelId, boolean includeDeleted);