The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/1934b94f66e56b520b89f7b6325f12509bb1efa9

commit 1934b94f66e56b520b89f7b6325f12509bb1efa9
Author: Mounir Lamouri <mlamouri@chromium.org>
Date: Thu Oct 12 13:34:50 2017

Media Engagement: do not require playback to be on a visible tab.

Bug:  774042 
Change-Id: Ica1e12bb87efda97f85ed49c9df74a2ac6219636
Reviewed-on: https://chromium-review.googlesource.com/716136
Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#508336}
[modify] https://crrev.com/1934b94f66e56b520b89f7b6325f12509bb1efa9/chrome/browser/media/media_engagement_browsertest.cc
[modify] https://crrev.com/1934b94f66e56b520b89f7b6325f12509bb1efa9/chrome/browser/media/media_engagement_contents_observer.cc
[modify] https://crrev.com/1934b94f66e56b520b89f7b6325f12509bb1efa9/chrome/browser/media/media_engagement_contents_observer.h
[modify] https://crrev.com/1934b94f66e56b520b89f7b6325f12509bb1efa9/chrome/browser/media/media_engagement_contents_observer_unittest.cc

Please add appropriate OSs.

[Auto-generated comment by a script] We noticed that this issue is targeted for M-63; it appears the fix may have landed after branch point, meaning a merge might be required. Please confirm if a merge is required here - if so add Merge-Request-63 label, otherwise remove Merge-TBD label. Thanks.

Verified on 10032.14.0, 63.0.3239.17 on ChromeOS. Removing chrome label and leaving status to fixed to test on other OS.