Sending GLMemory buffers into VAAPI plugins

[Matt Fischer]

I was just making use of the API's that are already there, since I don't know
this code very well.  Since GstVaapiTextureEGL already creates a surface
internally (which it does by creating an EGLImage, exporting it to a DRM
handle, and then calling gst_vaapi_surface_new_with_gem_buf_handle()), I
just used that code.  It looks like it would be possible to export the
EGLImage to a dmabuf handle instead of a DRM handle, and import that into
the surface using gst_vaapi_surface_new_with_dma_buf_handle(), but I'm not
sure I see how that would improve anything over the existing mechanism.



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