GitLab

Add test cases to fulfill expectations from ticket:
* LookupDefaultInputDeviceWithProperGroupId
* LookupDefaultOutputDeviceWithProperGroupId

R=olka@chromium.org

Bug: 764291
Change-Id: Ie1586febb83802df5a836d98c8a65d1bec643dd2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2199062Reviewed-by: Olga Sharonova <olka@chromium.org>
Commit-Queue: Olga Sharonova <olka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774605}