[Bug 766206] plugins: negotiate GstGLContext during the GstContext sharing

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=766206

--- Comment #3 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Created attachment 331374
  --> https://bugzilla.gnome.org/attachment.cgi?id=331374&action=edit
vaapidecode: delay the GstVaapiDisplay instantiating

Delay the GstVaapiDisplay instantiating until the VA decoder has to be
initialized. In this way the element has more chances to find an already
created GstVaapiDisplay, or a GL context, in the pipeline.

In order to delay the VA display instantiating, it is no possible to force the
driver white list check when the element is changing state from NULL to READY
anymore, because there is not a VA display to check. Hence, the vmethod
change_state() is not handled anymore.

Nonetheless, this brings a regression: the driver white list check up is not
functional anymore. This regression will be addressed again in other task.

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