EnqueuePackets() would reset the last process time if the queue
and media budgets were empty. This was done without reducing the
padding debt.
The result of this was that, given an existing debt, and an interval
between audio packets that is less than the drain time for the padding
debt, padding would not be sent at all.
Now, before adding a new packet, we reduce the padding debt if the
packet queue is empty.
Bug: webrtc:10809
Change-Id: I116169522c215257febd32e17abab45f1a7d609f
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/171808
Reviewed-by: Sebastian Jansson <srte@webrtc.org>
Commit-Queue: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30949}
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