tree 953bb593b84114315ec29afd47c65b6ec3d63e27
parent d54b7afffb4c2de8b140760fd3773c40425e44e8
author Yu-Hsuan Hsu <yuhsuan@chromium.org> 1594365380 +0800
committer Commit Bot <commit-bot@chromium.org> 1594806090 +0000

CRAS: Log the volume of output devices

It is used for tracing the user behavior on the volume setting.
When the device is closed, submit the volume to the UMA server.

BUG=b:160939695
TEST=Play audio and check the chrome://histograms

Change-Id: Ib6b60f546fbdd74eea59525c2ed18a54cd422b4c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/adhd/+/2291484
Reviewed-by: Cheng-Yi Chiang <cychiang@chromium.org>
Commit-Queue: Yu-Hsuan Hsu <yuhsuan@chromium.org>
Tested-by: Yu-Hsuan Hsu <yuhsuan@chromium.org>