All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=755230

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=d54243e1721550eff658c62241949aa7bb898fc4cc97148411ac27b79bc37cbd


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/8971261465316082144

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

Suspected Commit
  Author : Khushal
  Commit : 1b8abc019a5b476d503bff7405120c44036799eb
  Date   : Thu Aug 10 05:16:17 2017
  Subject: cc/blink: Replace SkImageGenerator with PaintImageGenerator.

Bisect Details
  Configuration: win_perf_bisect
  Benchmark    : smoothness.tough_canvas_cases
  Metric       : frame_times/http___ie.microsoft.com_testdrive_Performance_FishIETank_Default.html
  Change       : 3507.22% | 29.8789728704 -> 1077.799125

Revision             Result                  N
chromium@493209      29.879 +- 2.65814       6      good
chromium@493243      28.783 +- 0.97929       6      good
chromium@493248      28.7353 +- 1.59385      6      good
chromium@493250      29.0304 +- 1.58677      6      good
chromium@493251      953.894 +- 197.531      6      bad       <--
chromium@493252      978.835 +- 215.563      6      bad
chromium@493260      1005.02 +- 308.425      6      bad
chromium@493277      986.694 +- 363.529      6      bad
chromium@493349      1077.8 +- 245.212       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=http...ie.microsoft.com.testdrive.Performance.FishIETank.Default.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/8971261465316082144


For feedback, file a bug with component Speed>Bisection