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We were incorrectly ignoring the stream latency component when
calculating the fixed latency of streams. This needs to be done
for both input and output.

Since these methods are very similar I've refactored the one our
input and output streams had into a common AudioMangerMac method.

BUG=783282
TEST=none

Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Ic583a2f314728b566a5a3e3de8c8ffd118652f91
Reviewed-on: https://chromium-review.googlesource.com/764542
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Olga Sharonova <olka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#516056}