All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=755585

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=207b0efa41521d5a47135fd68d28cd3a5bc894085fc143b69b8664b0b0842c57


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

chromium-rel-mac11
win-high-dpi

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8971177116902188496

=== 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: mac_10_11_perf_bisect
  Benchmark    : system_health.common_desktop
  Metric       : cpu_time_percentage_avg/load_games/load_games_bubbles
  Change       : 32.67% | 0.362707079621 -> 0.481187816898

Revision             Result                     N
chromium@493236      0.362707 +- 0.0849603      6      good
chromium@493250      0.380359 +- 0.0770384      9      good
chromium@493251      0.513955 +- 0.0344318      6      bad       <--
chromium@493252      0.516148 +- 0.0528813      6      bad
chromium@493254      0.49523 +- 0.0806638       6      bad
chromium@493257      0.500862 +- 0.080086       6      bad
chromium@493264      0.486797 +- 0.121628       6      bad
chromium@493292      0.509817 +- 0.0564334      6      bad
chromium@493347      0.481188 +- 0.0752074      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=load.games.bubbles system_health.common_desktop

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8971177116902188496


For feedback, file a bug with component Speed>Bisection