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The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c0c0d24f28cef4117e92c146a89c97703401e866

commit c0c0d24f28cef4117e92c146a89c97703401e866
Author: Olga Sharonova <olka@chromium.org>
Date: Tue Jun 19 10:13:47 2018

Feature flag to launch the audio service on the browser startup.

Audio process experiment is observing performance regressions caused by
on-the-flight audio process launch. Introducing a feature flag to
pre-launch it on the browser startup.
This will be rolled out as another AudioService experiment group, to
evaluate memory and performance impact.

TEST=manual

Bug: 851611,853781
Change-Id: I30c1798dae07c5ce8a71243ab482ceb89d008e43
Reviewed-on: https://chromium-review.googlesource.com/1104681
Commit-Queue: Olga Sharonova <olka@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568389}
[modify] https://crrev.com/c0c0d24f28cef4117e92c146a89c97703401e866/content/browser/browser_main_loop.cc
[modify] https://crrev.com/c0c0d24f28cef4117e92c146a89c97703401e866/content/browser/browser_main_loop.h
[modify] https://crrev.com/c0c0d24f28cef4117e92c146a89c97703401e866/content/public/common/content_features.cc
[modify] https://crrev.com/c0c0d24f28cef4117e92c146a89c97703401e866/content/public/common/content_features.h
[modify] https://crrev.com/c0c0d24f28cef4117e92c146a89c97703401e866/services/audio/service.cc

This is landed in 69.0.3466.0 on June 19.
Requesting a merge.
The feature is behind a flag. This is a low-risk change.
Having it in M68 will allow us to refine the experiment we are running in Beta there.

This bug requires manual review: M68 has already been promoted to the beta branch, so this requires manual review
Please contact the 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

Approving merge for M68. Branch:3440

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/79036150d6fc5528eca0a34a8cb9e9b810f2ff05

commit 79036150d6fc5528eca0a34a8cb9e9b810f2ff05
Author: Olga Sharonova <olka@chromium.org>
Date: Tue Jun 26 17:17:35 2018

Feature flag to launch the audio service on the browser startup.

Audio process experiment is observing performance regressions caused by
on-the-flight audio process launch. Introducing a feature flag to
pre-launch it on the browser startup.
This will be rolled out as another AudioService experiment group, to
evaluate memory and performance impact.

TEST=manual

Bug: 851611,853781,  856672 
Change-Id: I30c1798dae07c5ce8a71243ab482ceb89d008e43
Reviewed-on: https://chromium-review.googlesource.com/1104681
Commit-Queue: Olga Sharonova <olka@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#568389}(cherry picked from commit c0c0d24f28cef4117e92c146a89c97703401e866)
Reviewed-on: https://chromium-review.googlesource.com/1115318
Reviewed-by: Olga Sharonova <olka@chromium.org>
Cr-Commit-Position: refs/branch-heads/3440@{#529}
Cr-Branched-From: 010ddcfda246975d194964ccf20038ebbdec6084-refs/heads/master@{#561733}
[modify] https://crrev.com/79036150d6fc5528eca0a34a8cb9e9b810f2ff05/content/browser/browser_main_loop.cc
[modify] https://crrev.com/79036150d6fc5528eca0a34a8cb9e9b810f2ff05/content/browser/browser_main_loop.h
[modify] https://crrev.com/79036150d6fc5528eca0a34a8cb9e9b810f2ff05/content/public/common/content_features.cc
[modify] https://crrev.com/79036150d6fc5528eca0a34a8cb9e9b810f2ff05/content/public/common/content_features.h
[modify] https://crrev.com/79036150d6fc5528eca0a34a8cb9e9b810f2ff05/services/audio/service.cc