[Bug 780442] gtreamer-vaapi render multi video in single pipeline causing videos not killed with vaapisink in wayland

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=780442

--- Comment #7 from Hyunjun Ko <zzoon at igalia.com> ---
Created attachment 349344
  --> https://bugzilla.gnome.org/attachment.cgi?id=349344&action=edit
libs: window: wayland: refactor event-handling

Seperates handling-event loop to new thread, which includes:
 - Using mutex to protect each frame information.
 - Dropping frame if there's pending frame.
 - Fixing counting pending frames.

Also, to avoid leakage, it sends null buffer while destruction.
Otherwise, usually the last buffer's callback is not called,
which leads to leak of GstVaapiDisplay. This fixes #774029.

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