am 7e11b16b: VideoView: expand documentation on state save/restore limitations

 * can load images from various sources (such as resources or content

 * providers), takes care of computing its measurement from the video so that

 * it can be used in any layout manager, and provides various display options

 * such as scaling and tinting.

 * such as scaling and tinting.<p>

 *

 * <em>Note: VideoView does not retain its full state when going into the

 * background.</em>  In particular, it does not restore the current play state,

 * play position, selected tracks, or any subtitle tracks added via

 * {@link #addSubtitleSource addSubtitleSource()}.  Applications should

 * save and restore these on their own in

 * {@link android.app.Activity#onSaveInstanceState} and

 * {@link android.app.Activity#onRestoreInstanceState}.<p>

 * Also note that the audio session id (from {@link #getAudioSessionId}) may

 * change from its previously returned value when the VideoView is restored.

 */

public class VideoView extends SurfaceView

        implements MediaPlayerControl, SubtitleController.Anchor {