All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=842216

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=5eb4d88b1086221a826d9b5f665cad40fdd1d4815736a3c6f2e472395d3f2238


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

android-nexus5

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/12a2593fc40000

📍 Found significant differences after each of 8 commits.
https://pinpoint-dot-chromeperf.appspot.com/job/12a2593fc40000

[builtins] Convert CEntry/GetProperty/StringAdd stubs to builtins by jgruber@chromium.org
https://chromium.googlesource.com/v8/v8/+/d8131cd63a8b037998a7bad6344e9cc308b315b3

[wasm] Make {WasmExportedFunction} fields easier to reach. by mstarzinger@chromium.org
https://chromium.googlesource.com/v8/v8/+/713e10c69e51e05134d91be0493828a916397946

[array] Move SafeRemoveArrayHoles to runtime by szuend@google.com
https://chromium.googlesource.com/v8/v8/+/2793d72cd73f55e9c699aa865445ad2a4f107309

[array] Move CopyFromPrototype to runtime by szuend@google.com
https://chromium.googlesource.com/v8/v8/+/855850eb7f78748ff6df40c096611680768e8fdc

Disable embedded builtins by jgruber@chromium.org
https://chromium.googlesource.com/v8/v8/+/e0c3f6d6ca005185e537fb85bbe841fe5dae5240

Remove unused functions by cwhan.tunz@gmail.com
https://chromium.googlesource.com/v8/v8/+/0b49d9f52a876f2272f72b3391b027f315a981d1

[array] Remove ShadowPrototypeElements post-processing from sort. by szuend@google.com
https://chromium.googlesource.com/v8/v8/+/369b447695a88ba9f059e26893b2000049bdde5e

Remove Document#selectedStylesheetSet/preferredStylesheetSet by cnardi@chromium.org
https://chromium.googlesource.com/chromium/src/+/62e388ac4d084b73649d99df72e651559be44077

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

Looks more like https://chromium.googlesource.com/v8/v8/+/e0c3f6d6ca005185e537fb85bbe841fe5dae5240 caused the regression, although from the commit that might have been expected.