Merge "Changed onGetScores() to return null instead of throwing exception."

                final String[] userDataValues = (String[]) args.arg5;

                final float[][] scores = onGetScores(algorithmName, algorithmArgs, actualValues,

                        Arrays.asList(userDataValues));

                if (scores != null) {

                    data.putParcelable(EXTRA_SCORES, new Scores(scores));

                }

                break;

            default:

                Log.w(TAG, "Handling unknown message: " + action);

    public float[][] onGetScores(@Nullable String algorithm,

            @Nullable Bundle args, @NonNull List<AutofillValue> actualValues,

            @NonNull List<String> userDataValues) {

        throw new UnsupportedOperationException("Must be implemented by external service");

        Log.e(TAG, "service implementation (" + getClass() + " does not implement onGetScore()");

        return null;

    }

    private final class AutofillFieldClassificationServiceWrapper