All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=775287

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=249b2aa822944c9711d79eb1390723079f106a1ecff82973c970f10cd23580fd


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

chromium-rel-mac-retina

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8965532918660050976

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

Suspected Commit
  Author : sunxd
  Commit : 48493dc45de06867eec97e7944f56d511e3c4578
  Date   : Thu Oct 12 20:25:14 2017
  Subject: cc: make solid color picture layer tiling respect device scale factor

Bisect Details
  Configuration: mac_retina_perf_bisect
  Benchmark    : media.desktop
  Metric       : cpu_time_percentage_avg/video.html?src_tulip2.mp4
  Change       : 3.14% | 0.130846844335 -> 0.13495237013

Revision             Result                      N
chromium@508375      0.130847 +- 0.0075133       9       good
chromium@508441      0.128937 +- 0.0166332       14      good
chromium@508442      0.133336 +- 0.0158243       14      bad       <--
chromium@508443      0.135431 +- 0.00154432      9       bad
chromium@508445      0.133861 +- 0.0115092       9       bad
chromium@508449      0.134236 +- 0.0102213       6       bad
chromium@508458      0.13392 +- 0.0165526        14      bad
chromium@508474      0.133318 +- 0.0142733       9       bad
chromium@508507      0.134952 +- 0.0107112       9       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=video.html.src.tulip2.mp4 media.desktop

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8965532918660050976


For feedback, file a bug with component Speed>Bisection