All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=880430

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=2d9ed9829124cfd0aa7d019cb0cee3837fd42f580e679b5fddd4e13cb08c6c7a


Bot(s) for this bug's original alert(s):

linux-perf
mac-10_12_laptop_low_end-perf
mac-10_13_laptop_high_end-perf

media.desktop - Benchmark documentation link:
  None

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/128c6ba3640000

📍 Couldn't reproduce a difference.
https://pinpoint-dot-chromeperf.appspot.com/job/128c6ba3640000

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/17879859640000

📍 Couldn't reproduce a difference.
https://pinpoint-dot-chromeperf.appspot.com/job/17879859640000

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/142525c3640000

📍 Found significant differences after each of 2 commits.
https://pinpoint-dot-chromeperf.appspot.com/job/142525c3640000

Reland "Sandbox audio service on Linux." by marinaciocea@chromium.org
https://chromium.googlesource.com/chromium/src/+/f2fc90bb74a05cffde6b4363ee575fcca7c45197
159.5 → 51.11 (-108.4)

Restoring field trial config for AudioService experiment on linux/mac by olka@chromium.org
https://chromium.googlesource.com/chromium/src/+/7ec94d0b3562d9414f716a1d6cb711d2fcf12c2f
52.51 → 86.28 (+33.78)

Understanding performance regressions:
  http://g.co/ChromePerformanceRegressions

Benchmark documentation link:
  None

1) Regression at 588278:588279 is here:
https://chromium.googlesource.com/chromium/src/+log/6818ca8f1d19ebe081353799e91a8de365c89075%5E..b797d1824a91a614229281e8d887c977de07942e?pretty=fuller&n=1000

So it must be https://chromium.googlesource.com/chromium/src/+/6818ca8f1d19ebe081353799e91a8de365c89075.

2) Another regression is 588371:588374 is cause by https://chromium.googlesource.com/chromium/src/+/7ec94d0b3562d9414f716a1d6cb711d2fcf12c2f and is Won't fix (see CL description)

tguilbert@: PTAL at 1) above - I guess it should be WontFix.

Thank you for following up!