All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=755587

(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/8971177110605946944

=== 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       : 50.58% | 0.337526300539 -> 0.508234497045

Revision             Result                      N
chromium@493236      0.337526 +- 0.0718803       6      good
chromium@493250      0.379828 +- 0.0450419       6      good
chromium@493251      0.541613 +- 0.00929086      6      bad       <--
chromium@493252      0.532367 +- 0.0161767       6      bad
chromium@493254      0.514175 +- 0.0508995       6      bad
chromium@493257      0.50347 +- 0.0786602        6      bad
chromium@493264      0.512697 +- 0.054379        6      bad
chromium@493292      0.512572 +- 0.047588        6      bad
chromium@493347      0.508234 +- 0.0676283       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/8971177110605946944


For feedback, file a bug with component Speed>Bisection