[Bug 782774] kmssink: drop last rendered buffer on ALLOCATION and DRAIN queries

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=782774

--- Comment #17 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Created attachment 355048
  --> https://bugzilla.gnome.org/attachment.cgi?id=355048&action=edit
kmssink: Factor out copying to dump buffer

This will be used to copy any upstream memory in order to return it on
resolution change, allocation query or drain query.

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