All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=770616

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=ddc44c4f18b50c30dfddd36fa3340bbced38413f8246c4d16eb482dbe2f26273


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

chromium-rel-mac-retina
chromium-rel-mac11
chromium-rel-mac11-air
chromium-rel-mac11-pro
chromium-rel-mac12
chromium-rel-mac12-mini-8gb
chromium-rel-win10
chromium-rel-win7-dual
chromium-rel-win7-gpu-ati
chromium-rel-win7-gpu-intel
chromium-rel-win7-gpu-nvidia
chromium-rel-win7-x64-dual
chromium-rel-win8-dual
win-high-dpi

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8966865030688340208

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

Suspected Commit
  Author : Marja Hölttä
  Commit : 40856948a64e2b76bc121a8841a763836dbf1b37
  Date   : Thu Sep 28 12:41:56 2017
  Subject: [parser] Skipping inner funcs: Turn off FLAG_preparser_scope_analysis.

Bisect Details
  Configuration: winx64nvidia_perf_bisect
  Benchmark    : v8.runtimestats.browsing_desktop
  Metric       : Parse:duration_avg/browse_social/browse_social_twitter_infinite_scroll
  Change       : 89.34% | 229.234222222 -> 434.038166667

Revision                           Result                  N
chromium@505150                    229.234 +- 127.065      9      good
chromium@505193                    218.852 +- 161.312      9      good
chromium@505204                    208.305 +- 28.8019      6      good
chromium@505209                    242.438 +- 63.4301      6      good
chromium@505210                    200.428 +- 61.6636      6      good
chromium@505210,v8@4ba6f15ece      201.736 +- 76.1901      6      good
chromium@505210,v8@40856948a6      390.195 +- 185.785      6      bad       <--
chromium@505210,v8@193dcf7693      388.243 +- 257.027      6      bad
chromium@505210,v8@e1cdda2512      440.786 +- 144.998      6      bad
chromium@505211                    410.648 +- 187.841      6      bad
chromium@505212                    396.851 +- 169.177      6      bad
chromium@505214                    373.301 +- 208.908      6      bad
chromium@505235                    434.038 +- 225.104      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.social.twitter.infinite.scroll 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/8966865030688340208


For feedback, file a bug with component Speed>Bisection