All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=787405

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=547c8e193fe60a4994f24807170cb3bde0d0820ecd03964fc3c5eb0d1a76107b


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

android-nexus5X

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8962316237489365264

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

Suspected Commit
  Author : Alexandr Ilin
  Commit : 698e803c4335c3e9429f580851a580b18e7daef0
  Date   : Thu Nov 16 21:07:36 2017
  Subject: Revert "Enable SpeculativePreconnect Field Trial Testing"

Bisect Details
  Configuration: android_nexus5X_perf_bisect
  Benchmark    : thread_times.key_silk_cases
  Metric       : thread_IO_cpu_time_per_frame/http___mobile-news.sandbox.google.com_news_pt0?swipe
  Change       : 14.53% | 4.094179987 -> 4.68895923346

Revision             Result                   N
chromium@517139      4.09418 +- 0.318068      9      good
chromium@517182      4.07136 +- 0.236761      6      good
chromium@517188      4.13415 +- 0.171356      6      good
chromium@517190      4.15454 +- 0.22101       6      good
chromium@517191      4.89023 +- 0.501574      6      bad       <--
chromium@517193      4.68218 +- 0.539093      6      bad
chromium@517204      4.67998 +- 0.468113      6      bad
chromium@517225      4.68896 +- 0.698467      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=http...mobile.news.sandbox.google.com.news.pt0.swipe thread_times.key_silk_cases

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8962316237489365264


For feedback, file a bug with component Speed>Bisection