All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=778183

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=647936f1c48087f5a6454109b45587a819b21303a3ba5f12315319192d874644


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

chromium-rel-win8-dual

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8964767815857541648

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

Suspected Commit
  Author : Hans Wennborg
  Commit : 22525134c75ca2a005997a717f6887a23af86210
  Date   : Mon Oct 23 17:10:25 2017
  Subject: win: Re-enable Clang by default

Bisect Details
  Configuration: win_8_perf_bisect
  Benchmark    : smoothness.tough_canvas_cases
  Metric       : frame_times/.._.._.._chrome_test_data_perf_canvas_bench_many_images.html
  Change       : 13.84% | 39.0390704085 -> 33.6360168696

Revision             Result                  N
chromium@510776      39.0391 +- 2.31165      6      good
chromium@510813      37.7061 +- 2.46316      9      good
chromium@510822      37.6587 +- 0.60373      9      good
chromium@510823      38.1777 +- 2.78001      9      good
chromium@510824      33.8732 +- 5.39372      9      bad       <--
chromium@510825      33.804 +- 3.25599       6      bad
chromium@510827      33.5704 +- 3.76637      6      bad
chromium@510831      33.4975 +- 4.75345      9      bad
chromium@510849      33.636 +- 1.88956       6      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=.........chrome.test.data.perf.canvas.bench.many.images.html smoothness.tough_canvas_cases

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8964767815857541648


For feedback, file a bug with component Speed>Bisection