queue: Add property to allow pushing all queued buffers together

Submitted by Jose Antonio Santos Cadenas

Description

Created attachment 299946
queue: Add property to allow pushing all queued buffers together

Attached patch adds a property that allows queue to send a buffer list with all the
queued buffers currently in the queue. If there are other kind of data in the queue order is preserved I mean, buffer list only contains buffers up to an event or a query.

~~Patch 299946~~, "queue: Add property to allow pushing all queued buffers together":
0001-queue-Add-property-to-allow-pushing-all-queued-buffe.patch