The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/cadeab771d8ddd5e78d677415b329ad424e693e5

commit cadeab771d8ddd5e78d677415b329ad424e693e5
Author: Mounir Lamouri <mlamouri@chromium.org>
Date: Fri Jun 01 21:14:56 2018

Add UKM UseCounter for AudioContext constructor.

Bug:  848512 
Change-Id: I39c9f087270e995e9be997cabab5553ef470aafb
Reviewed-on: https://chromium-review.googlesource.com/1081355
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Cr-Commit-Position: refs/heads/master@{#563798}
[modify] https://crrev.com/cadeab771d8ddd5e78d677415b329ad424e693e5/chrome/browser/page_load_metrics/observers/use_counter/ukm_features.cc

We would like to merge this into M68 for metrics.

Your change meets the bar and is auto-approved for M68. Please go ahead and merge the CL to branch 3440 manually. Please contact milestone owner if you have questions.
Owners: cmasso@(Android), kariahda@(iOS), bhthompson@(ChromeOS), abdulsyed@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8899e089c0052f8616363eff739599e971b50dd5

commit 8899e089c0052f8616363eff739599e971b50dd5
Author: Mounir Lamouri <mlamouri@chromium.org>
Date: Sat Jun 02 22:10:24 2018

Add UKM UseCounter for AudioContext constructor.

Bug:  848512 
Change-Id: I39c9f087270e995e9be997cabab5553ef470aafb
Reviewed-on: https://chromium-review.googlesource.com/1081355
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#563798}(cherry picked from commit cadeab771d8ddd5e78d677415b329ad424e693e5)
Reviewed-on: https://chromium-review.googlesource.com/1084082
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/branch-heads/3440@{#122}
Cr-Branched-From: 010ddcfda246975d194964ccf20038ebbdec6084-refs/heads/master@{#561733}
[modify] https://crrev.com/8899e089c0052f8616363eff739599e971b50dd5/chrome/browser/page_load_metrics/observers/use_counter/ukm_features.cc