All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=877246

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=a1b2d7a415c9a595c3627867211dd8a5b0ddd0834fc5a2602dfc41bc7f0c6343


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

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

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/15e20c72640000

📍 Couldn't reproduce a difference.
https://pinpoint-dot-chromeperf.appspot.com/job/15e20c72640000

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/16b90002e40000

📍 Found significant differences after each of 3 commits.
https://pinpoint-dot-chromeperf.appspot.com/job/16b90002e40000

[Base] Use background mode for ThreadPriority::BACKGROUND threads (behind feature). by fdoray@chromium.org
https://chromium.googlesource.com/chromium/src/+/c7196c14b362446bd55e39b0a1da7d3f8783b61b
time_to_audio_play: 67.89 → 61.07 (-6.826)

Set an expiry date for unused histograms. by gayane@chromium.org
https://chromium.googlesource.com/chromium/src/+/b73d0f475c637143e98ddf5d1a9c439f8b597c9d
time_to_audio_play: 61.01 → 63.12 (+2.111)

Turn on OOP Raster on mac bots by enne@chromium.org
https://chromium.googlesource.com/chromium/src/+/ee35f329c8e615505326a3b4df9ae4b7764037ae
time_to_audio_play: 63.12 → 102.3 (+39.15)

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

Benchmark documentation link:
  None

https://chromium.googlesource.com/chromium/src/+/c7196c14b362446bd55e39b0a1da7d3f8783b61b is a Windows-only change