All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=661927

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgo8To8AkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgw-yZ4AgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg49jnuQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgo9j4_AoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg44zHuwsM


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

chromium-rel-win7-gpu-ati
chromium-rel-win7-gpu-intel
chromium-rel-win7-gpu-nvidia
chromium-rel-win8-dual

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8997022358833893200

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


===== SUSPECTED CL(s) =====
Subject : Add crash keys to TaskQueueManager::ProcessTaskFromWorkQueue
Author  : alexclarke
Commit description:
  
We suspect a bad task closure is getting posted and would like to
add crash keys to aid diagnosis.

BUG=660427

Review-Url: https://codereview.chromium.org/2464853002
Cr-Commit-Position: refs/heads/master@{#429285}
Commit  : c08c078b27b353f4ab8de7deccfb862270b1ff2a
Date    : Wed Nov 02 15:49:06 2016


===== TESTED REVISIONS =====
Revision         Mean     Std Dev   N  Good?
chromium@429278  108.725  0.63245   5  good
chromium@429282  108.633  0.794867  5  good
chromium@429284  108.918  0.489541  5  good
chromium@429285  200.111  125.351   5  bad    <--

Bisect job ran on: win_8_perf_bisect
Bug ID: 661927

Test Command: src/tools/perf/run_benchmark -v --browser=release --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests page_cycler_v2_site_isolation.basic_oopif
Test Metric: timeToFirstContentfulPaint_avg/pcv1-warm/http___booking.com
Relative Change: 84.05%
Score: 80.0

Buildbot stdio: http://build.chromium.org/p/tryserver.chromium.perf/builders/win_8_perf_bisect/builds/2270
Job details: https://chromeperf.appspot.com/buildbucket_job_status/8997022358833893200


Not what you expected? We'll investigate and get back to you!
  https://chromeperf.appspot.com/bad_bisect?try_job_id=6533178511065088

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|  X  | for more information addressing perf regression bugs. For feedback,
| / \ | file a bug with component Tests>AutoBisect.  Thank you!

+alexclarke as FYI (I reached here from  bug 662293 )

I guess this isn't unexpected, we'll remove the crash keys next week once we've gathered enough data to fully understand https://bugs.chromium.org/p/chromium/issues/detail?id=649645.

Forgot to say I reverted the patch.