All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=747259

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=8380816f398879e59802f4571d24053f88fbdcc3e5b56299a88434adec15f208


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

android-one
android-webview-nexus5X
chromium-rel-mac-retina
chromium-rel-win7-dual

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8973475683385752208

=== BISECT JOB RESULTS ===
Perf regression found with culprit

Suspected Commit
  Author : Michael Lippautz
  Commit : 24195a6d06985906a72fa2fcf27546bcb10a4a99
  Date   : Mon Jul 17 13:04:02 2017
  Subject: [heap] Scavenger: Use LABs

Bisect Details
  Configuration: android_one_perf_bisect
  Benchmark    : v8.runtimestats.browsing_mobile
  Metric       : v8-gc-incremental-start_sum/browse_social/browse_social_twitter
  Change       : 95.26% | 2.01888888889 -> 3.94211111111

Revision                           Result                   N
chromium@486073                    2.01889 +- 3.51491       9      good
chromium@486875                    1.876 +- 1.01751         6      good
chromium@487076                    2.068 +- 0.262263        6      good
chromium@487126                    1.82733 +- 0.898508      6      good
chromium@487139                    2.02817 +- 0.150183      6      good
chromium@487145                    1.91817 +- 1.0924        6      good
chromium@487146                    2.087 +- 0.270474        6      good
chromium@487146,v8@9a0403a679      2.002 +- 0.15468         6      good
chromium@487146,v8@07a743df0a      1.99467 +- 0.119947      6      good
chromium@487146,v8@24195a6d06      3.86883 +- 0.794374      6      bad       <--
chromium@487147                    3.91483 +- 0.995746      6      bad
chromium@487148                    4.03367 +- 0.23434       6      bad
chromium@487151                    4.03983 +- 0.124028      6      bad
chromium@487176                    3.95267 +- 0.698883      6      bad
chromium@487276                    4.09833 +- 0.487091      6      bad
chromium@487676                    3.94211 +- 1.16576       9      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=android-chromium --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=browse.social.twitter v8.runtimestats.browsing_mobile

More information on addressing performance regressions:
  http://g.co/ChromePerformanceRegressions

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8973475683385752208


For feedback, file a bug with component Speed>Bisection