All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=778184

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=8de86cc9ce081ac2eaba65c5923a69ba6a2d85851e202cec7b3dc871ab6128b7


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

chromium-rel-win7-x64-dual

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8964767779947738592

=== 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_x64_perf_bisect
  Benchmark    : smoothness.tough_canvas_cases
  Metric       : frame_times/tough_canvas_cases_rendering_throughput_canvas_lines.html
  Change       : 15.70% | 26.2709424096 -> 30.395794597

Revision             Result                   N
chromium@510776      26.2709 +- 1.16858       6      good
chromium@510814      27.91 +- 1.77965         6      good
chromium@510819      26.6436 +- 0.432353      6      good
chromium@510822      26.7673 +- 0.882409      6      good
chromium@510823      27.1347 +- 0.543559      6      good
chromium@510824      29.7434 +- 0.839727      6      bad       <--
chromium@510833      29.4514 +- 1.70263       9      bad
chromium@510851      30.3958 +- 1.19187       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=tough.canvas.cases.rendering.throughput.canvas.lines.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/8964767779947738592


For feedback, file a bug with component Speed>Bisection