All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=742343

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=0b82be02a10d0fc90bdd7fa650236045c2cdb45c4ad0607aeb0f70b7ede6dc0b


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

chromium-rel-win7-gpu-ati

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8974178141671134688

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

Suspected Commit
  Author : Marc Treib
  Commit : da2086682fef5cc44b539dc4bdc63af380e2988b
  Date   : Tue Jul 11 09:16:07 2017
  Subject: Fieldtrial testing config for CaptureThumbnailOnLoadFinished

Bisect Details
  Configuration: winx64ati_perf_bisect
  Benchmark    : loading.desktop
  Metric       : timeToFirstContentfulPaint_avg/pcv1-warm/AirBnB
  Change       : 82.29% | 391.204222221 -> 714.875499999

Revision             Result                  N
chromium@485549      391.204 +- 7.14675      9       good
chromium@485565      396.925 +- 46.9238      14      good
chromium@485567      452.629 +- 746.999      14      good
chromium@485568      666.993 +- 455.861      14      bad       <--
chromium@485569      679.16 +- 305.664       9       bad
chromium@485573      646.348 +- 498.658      14      bad
chromium@485581      650.203 +- 376.119      9       bad
chromium@485612      714.875 +- 3.76367      6       bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=release_x64 --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=AirBnB loading.desktop

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8974178141671134688


For feedback, file a bug with component Speed>Bisection