All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=787855

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=2c7dee9703b606f1e8549f70a5ec87a656873ec1f7817302887e8b4e59bbc9a1


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

android-webview-nexus6

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8962209910249318304

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

Suspected Commit
  Author : Ian Kilpatrick
  Commit : 98b46470f307a68c8183d628237d7b361af96244
  Date   : Tue Nov 21 01:22:24 2017
  Subject: Add secure_context_mode_ to CSSParserContext.

Bisect Details
  Configuration: android_webview_nexus6_aosp_perf_bisect
  Benchmark    : blink_perf.css
  Metric       : CSSPropertyUpdateValue/CSSPropertyUpdateValue
  Change       : 42.74% | 1328.40491041 -> 760.673935823

Revision             Result                  N
chromium@517977      1328.4 +- 26.4533       6      good
chromium@518004      1388.66 +- 40.9688      6      good
chromium@518011      1300.92 +- 14.6466      6      good
chromium@518014      1306.93 +- 30.6503      6      good
chromium@518015      1303.34 +- 18.9508      6      good
chromium@518016      751.512 +- 6.50984      6      bad       <--
chromium@518017      749.059 +- 5.8097       6      bad
chromium@518030      760.674 +- 5.0114       6      bad

Please refer to the following doc on diagnosing blink_perf regressions:
  https://chromium.googlesource.com/chromium/src/+/master/docs/speed/benchmark_harnesses/blink_perf.md

To Run This Test
  src/tools/perf/run_benchmark -v --browser=android-webview --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests blink_perf.css

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8962209910249318304


For feedback, file a bug with component Speed>Bisection