All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=772281

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=0452463347fc36c16d5a84038bd121ebe9c8d27b61f62121d1162d5d34dd53f8


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

chromium-rel-mac11
chromium-rel-mac11-air
chromium-rel-mac11-pro
chromium-rel-mac12
chromium-rel-mac12-mini-8gb
chromium-rel-win7-x64-dual
chromium-rel-win8-dual
linux-release
win-high-dpi

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8966510496447275312

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

Suspected Commit
  Author : Benedikt Meurer
  Commit : 08db4d7652967c1ed12450a73ff53f5d6bbf1fdf
  Date   : Mon Oct 02 12:35:05 2017
  Subject: [ic] Properly handle polymorphic symbol accesses.

Bisect Details
  Configuration: win_8_perf_bisect
  Benchmark    : v8.runtimestats.browsing_desktop
  Metric       : IC:duration_avg/browse_media/browse_media_tumblr
  Change       : 163.38% | 123.097666667 -> 277.895666667

Revision                           Result                  N
chromium@505652                    123.098 +- 231.543      9      good
chromium@505694                    120.587 +- 310.379      9      good
chromium@505715                    116.396 +- 274.455      9      good
chromium@505726                    114.494 +- 245.125      9      good
chromium@505731                    111.098 +- 234.629      9      good
chromium@505731,v8@08db4d7652      245.624 +- 143.451      9      bad       <--
chromium@505731,v8@17d86d76fb      278.593 +- 35.3554      9      bad
chromium@505731,v8@1fa0f9ba4c      273.135 +- 30.4652      9      bad
chromium@505732                    297.474 +- 210.14       9      bad
chromium@505733                    274.316 +- 95.3637      9      bad
chromium@505735                    277.896 +- 45.9686      9      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=release --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=browse.media.tumblr v8.runtimestats.browsing_desktop

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8966510496447275312


For feedback, file a bug with component Speed>Bisection