All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=841248

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=2b502dca7752f654d879e8d64094837b1fea8ea1e069d6a6228bade0efb23f95


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

android-webview-nexus6

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/12c3ef97c40000

recovered

📍 Found significant differences after each of 5 commits.
https://pinpoint-dot-chromeperf.appspot.com/job/12c3ef97c40000

Report video group ID in low-level device enumerations and notifications. by guidou@chromium.org
https://chromium.googlesource.com/chromium/src/+/2aa26b30517b6a33ba7edf8f2d17353c919de855

[oilpan] Enable incremental marking buildflag by mlippautz@chromium.org
https://chromium.googlesource.com/chromium/src/+/bd9ac13acc9d99a4f192b2734613545c187a319c

[Background Fetch] Update metadata storage. by rayankans@chromium.org
https://chromium.googlesource.com/chromium/src/+/7a28724a5c043031f80ddf6582c629f0b3965bd4

Make MediaStreamManager/Dispatcher report device group ID. by guidou@chromium.org
https://chromium.googlesource.com/chromium/src/+/814d076a9365c16da0ad910244526484b6e586dd

[Video Capture Service] Break dependency of video capture service Mojo API from media_types.mojom by chfremer@chromium.org
https://chromium.googlesource.com/chromium/src/+/1cecc366923d3a4ff31f9f36465c7da1155f7a16

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

We had to revert and reland to get a clear picture.

Pinpoint suggests

[oilpan] Enable incremental marking buildflag by mlippautz@chromium.org
https://chromium.googlesource.com/chromium/src/+/bd9ac13acc9d99a4f192b2734613545c187a319c

We decided to go with the regressions on microbenchmarks right now as a Finch study is showing large improvements for real world. We still keep them open though as they are worth looking at for optimizing the write barrier.