All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=754244

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=eee35c0ecd4105fbc9c10d20630538537e040efea2670149c435df6cbc51e358


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

android-nexus6

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8971644038249352000

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

Suspected Commit
  Author : sunxd
  Commit : 7c9302475a38992e7555d7ce8496ea1da797f4bc
  Date   : Wed Aug 02 21:44:28 2017
  Subject: cc: Use render surface draw transform when occluding mask layer.

Bisect Details
  Configuration: android_nexus6_perf_bisect
  Benchmark    : system_health.common_mobile
  Metric       : cpu_time_percentage_avg/browse_social/browse_social_instagram
  Change       : 2.12% | 0.545940978374 -> 0.557511980483

Revision             Result                      N
chromium@491503      0.545941 +- 0.00809157      6      good
chromium@491510      0.546993 +- 0.00831812      6      good
chromium@491513      0.543612 +- 0.00261235      6      good
chromium@491514      0.556325 +- 0.00723357      6      bad       <--
chromium@491515      0.55828 +- 0.0107381        6      bad
chromium@491516      0.559494 +- 0.00566935      6      bad
chromium@491529      0.557746 +- 0.00336081      6      bad
chromium@491555      0.556337 +- 0.00441996      6      bad
chromium@491606      0.557512 +- 0.00792943      6      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=android-chromium --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=browse.social.instagram system_health.common_mobile

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8971644038249352000


For feedback, file a bug with component Speed>Bisection