[Bug 788503] fix the check for dmabuf handling in downstream

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=788503

--- Comment #4 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Created attachment 360900
  --> https://bugzilla.gnome.org/attachment.cgi?id=360900&action=edit
plugins: only dmabuf on srcpad if downstream

Set if source pad can handle dmabuf only if the GstGL context comes
from downstream.

It is possible to know that at two moments:

1\ In the case of GstGLTextureUpload caps feature is negotiated and
   downstream pool reports back gst.gl.GstGLContext.

2\ When GstGLContext is found as GstContext from dowstream.

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