[Bug 757933] When a pipeline is in GST_STATE_READY, "sync-message::need-context" is not emitted for GstGL.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=757933

--- Comment #4 from ChangSeok Oh <changseok at gnome.org> ---
I looked into this in detail for a while.
In a nutshell, gstreamer changes READY to NULL and destory the provided
other_context while removing gst pads and elements, even though webkit set the
pipeline GST_STATE_READY.

sequence flow is like that.
webkit receives GST_MESSAGE_EOS -> webkit sets GST_STATE_READY to the pipeline
-> gst set READY state successfully but eventually set the statue NULL while
processing -> webkit's state is still READY though, gst's state is already NULL
-> webkit set NULL to the pipeline after 60secs.

I dumped a backtrace when gstglimage destroyed the given other context and
highlighted important functions there. [1]
Also, I leave GST_DEBUG logs as well. [2]
In my humble opinion, this is much related with unlinking pads and destroying
them when setting the READY state.

[1] http://pastebin.com/BXkaYCuy
[2] http://pastebin.com/gHSSd2QD

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