All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=762177

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=0ae4edfb628d122dab936836031ff7826f7a29a0fd83211c798cdee0f830e30f


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

chromium-rel-mac-retina
chromium-rel-mac11
chromium-rel-mac11-pro

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8969257650596198240

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

Suspected Commit
  Author : Sunny Sachanandani
  Commit : c7a7949c958b4867600ca716968da430fd9b952f
  Date   : Wed Aug 30 22:21:33 2017
  Subject: cc: Flush command buffers when all tiles are done.

Bisect Details
  Configuration: mac_pro_perf_bisect
  Benchmark    : thread_times.tough_scrolling_cases
  Metric       : thread_total_all_cpu_time_per_frame/text_20000_pixels_per_second
  Change       : 37.44% | 11.4498773797 -> 15.7371201992

Revision             Result                  N
chromium@498607      11.4499 +- 0.75569      6      good
chromium@498638      11.7235 +- 1.72331      6      good
chromium@498639      11.2737 +- 1.10974      6      good
chromium@498640      14.452 +- 3.926         9      bad       <--
chromium@498642      14.839 +- 3.69042       6      bad
chromium@498646      14.2743 +- 2.96558      6      bad
chromium@498653      14.5022 +- 2.41062      6      bad
chromium@498668      14.3546 +- 4.44854      9      bad
chromium@498729      15.7371 +- 3.67929      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=text.20000.pixels.per.second thread_times.tough_scrolling_cases

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8969257650596198240


For feedback, file a bug with component Speed>Bisection