Ensure that the video surface has been associated with the native media player.
Ordinarily when setting the video surface the actual association of the video surface with
the native media player is deferred until the first time media is played.
This deferring behaviour is usually a good thing because when setting a video surface
component on the native media player the video surface component must be a displayable
component and this is often not the case during the construction and initialisation of the
application.
Most applications will not need to call this method.
However, in special circumstances such as associating an embedded media player with a media
list player, media is played through the media list rather than the media player itself so
the deferred association of the video surface would never happen.
Calling this method ensures that the video surface is properly associated with the native
media player and consequently the video surface component must be visible when this method is
called.