All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=623839

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgovmssAsM


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

chromium-rel-mac-hdd

=== Auto-CCing suspected CL author alokp@chromium.org ===

Hi alokp@chromium.org, the bisect results pointed to your CL below as possibly
causing a regression. Please have a look at this info and see whether
your CL be related.


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


===== SUSPECTED CL(s) =====
Subject : Avoid flooding main thread by caching state on media thread.
Author  : alokp
Commit description:
  
OnStatisticsUpdate and OnBufferedTimeRangesChanged fire much more
frequently than queried for. Posting all state change notifications
to the main thread causes potential performance issues. Cache state
not immediately required by PipelineClient on the media thread to
avoid having to post all state change notifications.

BUG= 619975 

Review-Url: https://codereview.chromium.org/2071503003
Cr-Commit-Position: refs/heads/master@{#401457}
Commit  : 8f268bb64214eab73f00216b96b919a1b2955999
Date    : Wed Jun 22 23:30:09 2016


===== TESTED REVISIONS =====
Revision         Mean    Std Dev  N  Good?
chromium@401453  1025.2  24.4683  5  good
chromium@401455  1007.8  22.1066  5  good
chromium@401456  997.2   31.3879  5  good
chromium@401457  1124.6  7.4027   5  bad    <--
chromium@401461  1113.4  25.9673  5  bad
chromium@401468  1151.6  104.77   5  bad
chromium@401483  1101.4  31.1737  5  bad

Bisect job ran on: mac_hdd_perf_bisect
Bug ID: 623839

Test Command: src/tools/perf/run_benchmark -v --browser=release --output-format=chartjson --upload-results --also-run-disabled-tests tab_switching.tough_energy_cases
Test Metric: idle_wakeups_total/idle_wakeups_total
Relative Change: 7.43%
Score: 99.9

Buildbot stdio: http://build.chromium.org/p/tryserver.chromium.perf/builders/mac_hdd_perf_bisect/builds/613
Job details: https://chromeperf.appspot.com/buildbucket_job_status/9008647844602382960


Not what you expected? We'll investigate and get back to you!
  https://chromeperf.appspot.com/bad_bisect?try_job_id=5289520463872000

| O O | Visit http://www.chromium.org/developers/speed-infra/perf-bug-faq
|  X  | for more information addressing perf regression bugs. For feedback,
| / \ | file a bug with component Tests>AutoBisect.  Thank you!

r399376 improved tab_switching.tough_energy_cases (938.2 vs 1095.7) but regressed media.tough_video_cases_extra as documented in  bug 619975 .

r401457 partially reverted r399376 to fix the regression in media.tough_video_cases_extra benchmark. But also restored the numbers for tab_switching.tough_energy_cases back to 1124.6.

Since this is not a regression from m52, marking as WontFix.