https://bugs.webkit.org/show_bug.cgi?id=89122

Reviewed by Martin Robinson.

Set the GStreamer pipeline to NULL instead of PAUSED on EOS. This
allows the audio-sink to release its connection to the audio
device. This is done only if the Media element is not
looping. To make the MediaPlayerPrivate layer aware of that
information the MediaPlayerClient interface was updated with a new
method mediaPlayerIsLooping, implemented by the HTMLMediaElement.

* html/HTMLMediaElement.cpp:
(WebCore::HTMLMediaElement::mediaPlayerIsLooping): Implementation of
MediaPlayerClient::mediaPlayerLoop, proxies to ::loop();
* html/HTMLMediaElement.h:
(HTMLMediaElement):
* platform/graphics/MediaPlayer.h:
(WebCore::MediaPlayerClient::mediaPlayerIsLooping): New method allowing
the MediaPlayer and its backend to know if a playback loop is
requested by the client.
* platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp:
(WebCore::MediaPlayerPrivateGStreamer::MediaPlayerPrivateGStreamer):
(WebCore::MediaPlayerPrivateGStreamer::playbackPosition): Report
seek time or media duration if EOS was reached. These early
returns are needed because the position query doesn't work on a
NULL pipeline.
(WebCore::MediaPlayerPrivateGStreamer::changePipelineState):
Refactored to use an early return.
(WebCore::MediaPlayerPrivateGStreamer::prepareToPlay): Reset the
seeking flag.
(WebCore::MediaPlayerPrivateGStreamer::play): reset m_isEndReached.
(WebCore::MediaPlayerPrivateGStreamer::pause): Don't pause on EOS.
(WebCore::MediaPlayerPrivateGStreamer::seek): Refactor, call
currentTime() after we're sure playbin is valid and no error occured.
(WebCore::MediaPlayerPrivateGStreamer::paused): Fake paused state
on EOS.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@128298 268f45cc-cd09-0410-ab3c-d52691b4dbfc