Test the play() function of <video> when fullscreen is required.
EVENT(canplaythrough)
EXPECTED (video.webkitSupportsFullscreen == 'true') OK
EXPECTED (video.webkitDisplayingFullscreen == 'false') OK
RUN(video.play())
EVENT(playing)
** Started playing
EXPECTED (internals.isChangingPresentationMode(video) == 'false') OK
EXPECTED (video.webkitDisplayingFullscreen == 'true') OK
RUN(video.webkitExitFullScreen())
EVENT(webkitpresentationmodechanged)
** Received webkitpresentationmodechanged event
Exited fullscreen
END OF TEST