TIF: Add @NonNull for Programs.Genres.encode/decode

package android.media.tv;

import android.annotation.NonNull;

import android.annotation.Nullable;

import android.annotation.SystemApi;

import android.content.ComponentName;

             * @return an encoded genre string that can be inserted into the

             *         {@link #COLUMN_BROADCAST_GENRE} or {@link #COLUMN_CANONICAL_GENRE} column.

             */

            public static String encode(String... genres) {

            public static String encode(@NonNull String... genres) {

                StringBuilder sb = new StringBuilder();

                String separator = "";

                for (String genre : genres) {

             *            {@link #COLUMN_BROADCAST_GENRE} or {@link #COLUMN_CANONICAL_GENRE} column.

             * @return genre strings.

             */

            public static String[] decode(String genres) {

            public static String[] decode(@NonNull String genres) {

                if (genres.isEmpty()) {

                    return EMPTY_STRING_ARRAY;

                }