All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=776739

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=4f74a5185a15cb2ed32b762b92241f6ee3b05888008ccb0b966d8c799c14dd49


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

android-nexus5
android-nexus5X
android-nexus6

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8965206867758113296

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

Suspected Commit
  Author : Stephen Chenney
  Commit : 8ff2371257ac4f24d77da4a62569840a53c49b47
  Date   : Thu Oct 12 13:11:52 2017
  Subject: Prevent squashing of border-radius layers

Bisect Details
  Configuration: android_nexus5_perf_bisect
  Benchmark    : smoothness.gpu_rasterization.top_25_smooth
  Metric       : mean_input_event_latency/https___www.google.com_calendar_
  Change       : 13.03% | 17.1776666667 -> 19.4161666667

Revision             Result                  N
chromium@508323      17.1777 +- 2.0841       6      good
chromium@508327      16.2455 +- 2.40768      6      good
chromium@508328      17.265 +- 3.38974       6      good
chromium@508329      20.2557 +- 1.74976      6      bad       <--
chromium@508330      20.2595 +- 3.17701      6      bad
chromium@508336      20.4847 +- 2.39411      6      bad
chromium@508349      21.5293 +- 1.65037      6      bad
chromium@508374      19.4162 +- 2.34113      6      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=https...www.google.com.calendar. smoothness.gpu_rasterization.top_25_smooth

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8965206867758113296


For feedback, file a bug with component Speed>Bisection