Merge "TIF: Remove the uniqueness check for track ID from notifyTracksChanged" into nyc-dev

         * with a different track ID.

         *

         * @param tracks A list which includes track information.

         * @throws IllegalArgumentException if {@code tracks} contains redundant tracks.

         */

        public void notifyTracksChanged(final List<TvTrackInfo> tracks) {

            Set<String> trackIdSet = new HashSet<>();

            for (TvTrackInfo track : tracks) {

                String trackId = track.getId();

                if (trackIdSet.contains(trackId)) {

                    throw new IllegalArgumentException("redundant track ID: " + trackId);

                }

                trackIdSet.add(trackId);

            }

            trackIdSet.clear();

            // TODO: Validate the track list.

            final List<TvTrackInfo> tracksCopy = new ArrayList<>(tracks);

            executeOrPostRunnableOnMainThread(new Runnable() {

                @MainThread