WebvttCssStyle.StyleFlags (ExoPlayer library)

```
@Documented
@Retention(SOURCE)
@Target(TYPE_USE)
public static @interface WebvttCssStyle.StyleFlags
```
Style flag enum. Possible flag values are WebvttCssStyle.UNSPECIFIED, WebvttCssStyle.STYLE_NORMAL, WebvttCssStyle.STYLE_BOLD, WebvttCssStyle.STYLE_ITALIC and WebvttCssStyle.STYLE_BOLD_ITALIC.