GitLab

Add a feature to disable AudioContext playbacks counting
towards the MEI score.

BUG=878460

Change-Id: I486f3853ebc26a703e52712bee13600c99c7be14
Reviewed-on: https://chromium-review.googlesource.com/1204728Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589046}