Before this change, the test used to preload the buffer with 10
packets before starting to pull out audio. With this change, the
preloading is determined by a new flag (--preload_packets) which
defaults to 0.
This affects all tests derived from NetEqQualityTest, i.e., all
binaries called neteq_*_quality_test.
Bug: none
Change-Id: I920845b968a81ea9972ce8a8e646df29aff200ba
Reviewed-on: https://webrtc-review.googlesource.com/49261
Reviewed-by: Alex Narest <alexnarest@webrtc.org>
Commit-Queue: Henrik Lundin <henrik.lundin@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21943}