All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=759662

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=55b4f104889f5e4771ea057143a1321d9d790a6a3b967e93e944d46183b1f0d4


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

chromium-rel-win10

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8970001131151697600

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

Suspected Commit
  Author : Nico Weber
  Commit : 7cd2f6bd73c6a9c6200704e995b18ebb3168ead6
  Date   : Sat Aug 19 04:23:54 2017
  Subject: win: Turn off clang-by-default again for now.

Bisect Details
  Configuration: winx64_10_perf_bisect
  Benchmark    : smoothness.tough_animation_cases
  Metric       : frame_times/overlay_background_color_css_transitions.html
  Change       : 16.11% | 130.078475169 -> 151.038563229

Revision             Result                  N
chromium@495784      130.078 +- 3.34728      6      good
chromium@495796      130.921 +- 7.72965      6      good
chromium@495799      129.273 +- 6.10452      6      good
chromium@495801      129.704 +- 3.99441      6      good
chromium@495802      150.797 +- 7.78565      6      bad       <--
chromium@495808      151.039 +- 8.09118      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=overlay.background.color.css.transitions.html smoothness.tough_animation_cases

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8970001131151697600


For feedback, file a bug with component Speed>Bisection