[Bug 740803] waylandsink: Double-check the frame callback before dropping frames

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=740803

--- Comment #6 from Praveen R Jadhav <praveen.j at samsung.com> ---
Created attachment 353731
  --> https://bugzilla.gnome.org/attachment.cgi?id=353731&action=edit
waylandsink: Conditional wait for FrameRedrawCallback before dropping the frame

While rendering, if frame_redraw_pending() is not called from wayland server
yet, then render()/expose() APIs should wait for atleast 1 frame duration
before dropping the frame completely.
This conditional wait operation will handle race conditions when render
requests are made from multiple paths.

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