[Bug 789476] vaapi plugins should not share their allocator within allcation query

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=789476

--- Comment #20 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Created attachment 367975
  --> https://bugzilla.gnome.org/attachment.cgi?id=367975&action=edit
plugins: handle vaapi allocator in allocation query

In propose_allocation() if the numer of allocation params is zero, the
system's allocator is added first, and lastly the native VA-API
allocator.

In decide_allocation(), the allocations params in query are travered,
looking for a native VA-API allocator. If it is found, it is reused as
src pad allocator. Otherwise, a new allocator is instantiated and
appended in the query.

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