All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=772283

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=f43abddf01887827ab9606874eeb872425f9e3bd48ddf13f98bcb655e724c9ea


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

chromium-rel-mac-retina
chromium-rel-mac12
chromium-rel-win10
chromium-rel-win7-dual
chromium-rel-win7-gpu-ati
chromium-rel-win7-gpu-intel
chromium-rel-win7-gpu-nvidia

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8966510435487055552

=== 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: winx64ati_perf_bisect
  Benchmark    : v8.runtimestats.browsing_desktop
  Metric       : IC:duration_avg/browse_media/browse_media_tumblr
  Change       : 93.21% | 71.8011666667 -> 138.724833333

Revision                           Result                  N
chromium@505721                    71.8012 +- 16.7714      6      good
chromium@505727                    70.287 +- 13.524        6      good
chromium@505730                    69.2398 +- 9.35918      6      good
chromium@505731                    77.3522 +- 54.5404      6      good
chromium@505731,v8@08db4d7652      160.616 +- 121.686      9      bad       <--
chromium@505731,v8@17d86d76fb      191.736 +- 94.7026      6      bad
chromium@505731,v8@1fa0f9ba4c      176.563 +- 133.753      9      bad
chromium@505732                    171.128 +- 77.7651      6      bad
chromium@505733                    135.885 +- 84.2376      6      bad
chromium@505744                    190.231 +- 79.6565      6      bad
chromium@505767                    161.91 +- 103.969       6      bad
chromium@505813                    138.725 +- 73.7213      6      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=release_x64 --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/8966510435487055552


For feedback, file a bug with component Speed>Bisection