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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #1 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Created attachment 331372
  --> https://bugzilla.gnome.org/attachment.cgi?id=331372&action=edit
plugins: add gst_vaapi_plugin_base_find_gl_context()

Using the GstContext mechanism, it is possible to find if the pipeline
shares a GstGLContext, even if we are not to negotiating GLTextureUpload
meta. This is interesting because we could negotiate system memory caps
feature, but enable DMABuf if the GstGLContext is EGL with some extensions.

This patch exposes a new method gst_vaapi_plugin_base_find_gl_context().

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