[Bug 791937] glimagesink: need fix video tearing

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=791937

--- Comment #2 from Haihua Hu <jared.hu at nxp.com> ---
Created attachment 366038
  --> https://bugzilla.gnome.org/attachment.cgi?id=366038&action=edit
glimagesink: need add glFinish after eglswapbuffer

when video playback using glimagesink, video tearing occurs. eglswapbuffer is
an async call that is to say the buffer maybe still used by GPU but we are
already prepare next buffer.

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