All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=801122

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=bb39c3a4a952fdc0c8a6ee7310d99c5ca245822291cd27fab8b38452464f636a


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

android-nexus6

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8957696314888968752

=== BISECT JOB RESULTS ===
NO Perf regression found

Bisect Details
  Configuration: android_nexus6_perf_bisect
  Benchmark    : smoothness.gpu_rasterization.tough_path_rendering_cases
  Metric       : frame_times/MotionMark_Canvas_Fill_Shapes

Revision             Result                  N
chromium@526689      90.4592 +- 3.46709      21      good
chromium@526811      90.4691 +- 3.12054      21      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=MotionMark.Canvas.Fill.Shapes smoothness.gpu_rasterization.tough_path_rendering_cases

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8957696314888968752


For feedback, file a bug with component Speed>Bisection

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/1199a3c2840000

Kicked off another bisect with wider range.

📍 Found significant differences after each of 3 commits.
https://pinpoint-dot-chromeperf.appspot.com/job/1199a3c2840000

WebVTT line, position and size cue properties stored as double
By k2.nagaraju@samsung.com · Tue Jan 02 13:11:56 2018
chromium @ fbdca255c3f886b43912e28e012e016334a8853c

Add include guards to highcontrast_classifier.h
By bratell@opera.com · Tue Jan 02 14:12:24 2018
chromium @ c6e321c6527e02f4f0a3f1b26b1acfecf44a814c

Enable new edge inversion handling in Skia.
By senorblanco@chromium.org · Tue Jan 02 17:16:48 2018
chromium @ e4d6d0b50ec2e40aabe6a8c9928f512101771bb1

Understanding performance regressions:
  http://g.co/ChromePerformanceRegressions

Looks like the first two commits are because there was a fluke in the build (crbug.com/806052). It's really the last one.

Enable new edge inversion handling in Skia.
By senorblanco@chromium.org · Tue Jan 02 17:16:48 2018
chromium @ e4d6d0b50ec2e40aabe6a8c9928f512101771bb1

Unfortunately, I think this is a regression we're going to have to live with. My change addressed some pretty serious artifacts, and some performance regression is expected. We may be able to make that back with future optimizations, but I don't think we can go back on correctness at this point.