All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=755769

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=34b9d3f7c784880e56bd60f4875ad876c56dc1719315f2f1420fb3b9589c8331


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

android-nexus5X
chromium-rel-mac11
chromium-rel-mac12

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8971155032178564560

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

Suspected Commit
  Author : Xu Xing
  Commit : e3775832e557909d8c24243acb0a5296444a0ce0
  Date   : Sun Aug 13 04:02:52 2017
  Subject: When being copied into another canvas, avoid to check if canvas is dirty

Bisect Details
  Configuration: mac_10_11_perf_bisect
  Benchmark    : blink_perf.canvas
  Metric       : draw-static-webgl-to-hw-accelerated-canvas-2d/draw-static-webgl-to-hw-accelerated-canvas-2d
  Change       : 96.29% | 102608.493726 -> 3803.058128

Revision             Result                  N
chromium@493985      102608 +- 10108.9       6      good
chromium@493986      104916 +- 6604.28       6      good
chromium@493987      3581.04 +- 216.863      6      bad       <--
chromium@493988      3727.99 +- 319.937      6      bad
chromium@493991      3803.06 +- 113.955      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 blink_perf.canvas

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8971155032178564560


For feedback, file a bug with component Speed>Bisection