Audio loopback latency test - add argument to specify period value.

BUG=chromium-os:32898
TEST=emerge autotest-deps-audioloop, run command
'/usr/local/autotest/deps/audioloop/src/loopback_latency -p 480 -b 1920'
on Lumpy, see measured latency and reported latency very close.

Change-Id: I093d69839e3b8b05bf88b679e8e2d58755f53a62
Reviewed-on: https://gerrit.chromium.org/gerrit/34255
Commit-Ready: Hsinyu Chao <hychao@chromium.org>
Tested-by: Hsinyu Chao <hychao@chromium.org>
Reviewed-by: Hsinyu Chao <hychao@chromium.org>
1 file changed