All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=653770

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg1fSI_ggM


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

chromium-rel-win7-dual

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8999485831372830592

It looks a kind of flaky problem, but let's run a bisect job just in case.

===== BISECT JOB RESULTS =====
Status: completed


===== SUSPECTED CL(s) =====
Subject : Prune CreateVisiblePositionDeprecated from VisibleSelection::visibleBase/Extent
Author  : xiaochengh
Commit description:
  
Caller of these two functions have already ensured clean layout, so this
patch safely prunes CreateVisiblePositionDeprecated from them.

BUG= 647219 

Review-Url: https://codereview.chromium.org/2362183002
Cr-Commit-Position: refs/heads/master@{#420866}
Commit  : 0db24bb3a3073a9296b05d5bfc592727db2f94c4
Date    : Mon Sep 26 02:12:59 2016


===== TESTED REVISIONS =====
Revision         Mean   Std Dev    N  Good?
chromium@420865  0.758  0.0109545  5  good
chromium@420866  0.946  0.0666521  5  bad    <--
chromium@420867  0.913  0.0115109  5  bad
chromium@420868  0.968  0.130029   5  bad
chromium@420871  0.983  0.149482   5  bad

Bisect job ran on: win_perf_bisect
Bug ID: 653770

Test Command: src/tools/perf/run_benchmark -v --browser=release --output-format=chartjson --upload-results --also-run-disabled-tests service_worker.service_worker_micro_benchmark
Test Metric: concurrent_1_response_50_percentile/concurrent_1_response_50_percentile
Relative Change: 29.68%
Score: 99.9

Buildbot stdio: http://build.chromium.org/p/tryserver.chromium.perf/builders/win_perf_bisect/builds/6989
Job details: https://chromeperf.appspot.com/buildbucket_job_status/8999485831372830592


Not what you expected? We'll investigate and get back to you!
  https://chromeperf.appspot.com/bad_bisect?try_job_id=5318007545397248

| O O | Visit http://www.chromium.org/developers/speed-infra/perf-bug-faq
|  X  | for more information addressing perf regression bugs. For feedback,
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