All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=763862

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=fc0477aab9ff6160416f5b845afa839cf122afab86bfc034f40be2c62da40c79


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

chromium-rel-mac-retina
chromium-rel-mac11
chromium-rel-mac11-air
chromium-rel-mac12-mini-8gb

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8968752566911878880

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

Suspected Commit
  Author : Sunny Sachanandani
  Commit : 2eb3c8ac7ffc6840dc07f5e8312576e107eece23
  Date   : Wed Sep 06 02:01:21 2017
  Subject: cc: Flush after every tile task set completes.

Bisect Details
  Configuration: mac_air_perf_bisect
  Benchmark    : thread_times.tough_scrolling_cases
  Metric       : thread_total_all_cpu_time_per_frame/text_constant_full_page_raster_05000_pixels_per_second
  Change       : 47.08% | 12.1805287596 -> 17.9146907629

Revision             Result                   N
chromium@499835      12.1805 +- 3.0291        6      good
chromium@499843      12.9134 +- 3.05765       6      good
chromium@499844      13.0201 +- 1.74777       6      good
chromium@499845      17.7986 +- 0.646888      6      bad       <--
chromium@499847      17.6372 +- 0.73244       6      bad
chromium@499850      18.1453 +- 0.794952      6      bad
chromium@499865      17.983 +- 1.15502        6      bad
chromium@499895      17.9147 +- 0.910242      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.constant.full.page.raster.05000.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/8968752566911878880


For feedback, file a bug with component Speed>Bisection