All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=773712

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=d5bcae1b4e0393984c5d5a65bcaa263adb5968ec4e23ba63a041e71f767fbaf6


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

chromium-rel-win7-gpu-ati

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8966017363656115664

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

Suspected Commit
  Author : Robert Phillips
  Commit : 3a9305383169524488cb84e9bd5dba95520c3ca7
  Date   : Thu Oct 05 11:31:03 2017
  Subject: Always use draws instead of clears for ANGLE D3D11

Bisect Details
  Configuration: winx64ati_perf_bisect
  Benchmark    : smoothness.tough_animation_cases
  Metric       : frame_times/overlay_background_color_css_transitions.html
  Change       : 6.51% | 103.62869218 -> 110.377625792

Revision                             Result                  N
chromium@506714                      103.629 +- 2.6189       6      good
chromium@506725                      102.307 +- 5.25861      6      good
chromium@506730                      102.771 +- 3.75065      6      good
chromium@506730,skia@3a93053831      109.592 +- 6.66106      9      bad       <--
chromium@506731                      108.983 +- 2.73456      6      bad
chromium@506732                      109.953 +- 2.74836      6      bad
chromium@506733                      109.733 +- 2.22013      6      bad
chromium@506735                      110.501 +- 2.456        6      bad
chromium@506755                      110.096 +- 2.89633      6      bad
chromium@506795                      110.378 +- 1.75743      6      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=release_x64 --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=overlay.background.color.css.transitions.html smoothness.tough_animation_cases

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8966017363656115664


For feedback, file a bug with component Speed>Bisection

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

Suspected Commit
  Author : Robert Phillips
  Commit : 3a9305383169524488cb84e9bd5dba95520c3ca7
  Date   : Thu Oct 05 11:31:03 2017
  Subject: Always use draws instead of clears for ANGLE D3D11

Bisect Details
  Configuration: winx64ati_perf_bisect
  Benchmark    : smoothness.tough_animation_cases
  Metric       : frame_times/overlay_background_color_css_transitions.html
  Change       : 6.51% | 103.62869218 -> 110.377625792

Revision                             Result                  N
chromium@506714                      103.629 +- 2.6189       6      good
chromium@506725                      102.307 +- 5.25861      6      good
chromium@506730                      102.771 +- 3.75065      6      good
chromium@506730,skia@3a93053831      109.592 +- 6.66106      9      bad       <--
chromium@506731                      108.983 +- 2.73456      6      bad
chromium@506732                      109.953 +- 2.74836      6      bad
chromium@506733                      109.733 +- 2.22013      6      bad
chromium@506735                      110.501 +- 2.456        6      bad
chromium@506755                      110.096 +- 2.89633      6      bad
chromium@506795                      110.378 +- 1.75743      6      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=release_x64 --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=overlay.background.color.css.transitions.html smoothness.tough_animation_cases

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8966017363656115664


For feedback, file a bug with component Speed>Bisection