Merge "Revert "Do not use DeviceConfig.getAllProperties()."" into main

      public static HashMap<String, String> getAllFlags(IContentProvider provider) {

        HashMap<String, String> allFlags = new HashMap<String, String>();

        try {

            Bundle args = new Bundle();

            args.putInt(Settings.CALL_METHOD_USER_KEY,

                ActivityManager.getService().getCurrentUser().id);

            Bundle b = provider.call(new AttributionSource(Process.myUid(),

                    resolveCallingPackage(), null), Settings.AUTHORITY,

                    Settings.CALL_METHOD_LIST_CONFIG, null, args);

            if (b != null) {

                Map<String, String> flagsToValues =

                    (HashMap) b.getSerializable(Settings.NameValueTable.VALUE);

                allFlags.putAll(flagsToValues);

        for (DeviceConfig.Properties properties : DeviceConfig.getAllProperties()) {

            List<String> keys = new ArrayList<>(properties.getKeyset());

            for (String flagName : properties.getKeyset()) {

                String fullName = properties.getNamespace() + "/" + flagName;

                allFlags.put(fullName, properties.getString(flagName, null));

            }

        } catch (RemoteException e) {

            throw new RuntimeException("Failed in IPC", e);

        }

        return allFlags;

      }